Abrégé

An error correction circuit (20) according to this invention includes a first error correction processing circuit (21) configured to perform error correction processing in a row direction on array data having undergone first coding in the row direction, an error detection processing circuit (26) configured to perform error detection processing in a column direction on the array data having undergone second coding in the column direction, a corrected-bit likelihood calculation circuit (24) configured to calculate for each row the sum of likelihoods of corrected bits each of which is a bit corrected by the first error correction processing circuit (21), a high-likelihood row detection circuit (25) configured to detect rows of the array data in the descending order of the sums of likelihoods of corrected bits of respective rows output from the corrected-bit likelihood calculation circuit (24), and a second error correction processing circuit (27) configured to correct a bit at which a column error-detected by the error detection processing circuit (26) and a row detected by the high-likelihood row detection circuit (25) cross each other. An error correction circuit capable of improving transmission characteristics while suppressing the circuit scale can be provided.

Classes IPC  ?

• G06F 11/10 - Détection ou correction d'erreur par introduction de redondance dans la représentation des données, p. ex. en utilisant des codes de contrôle en ajoutant des chiffres binaires ou des symboles particuliers aux données exprimées suivant un code, p. ex. contrôle de parité, exclusion des 9 ou des 11

Abrégé

An optical device manufacturing method and an optical device manufacturing apparatus using local etching are characterized in that in a wafer process of manufacturing a waveguide type optical device including a light-propagating core and a cladding, a nozzle which locally performs etching processing is used for movement, and a slanted end surface at an arbitrary angle, an end surface having a curved shape, or a core having a varying film thickness is formed in an arbitrary position on the wafer. A slanted end surface is formed at an optical waveguide end using local etching, for example, a 45° reflective mirror, a light-condensing nonplanar reflective mirror, or a film thickness controlled core is implemented, and high-efficiency optical connection is realized.

Classes IPC  ?

• G03F 7/00 - Production par voie photomécanique, p. ex. photolithographique, de surfaces texturées, p. ex. surfaces impriméesMatériaux à cet effet, p. ex. comportant des photoréservesAppareillages spécialement adaptés à cet effet
• G02B 6/42 - Couplage de guides de lumière avec des éléments opto-électroniques
• G03F 7/20 - ExpositionAppareillages à cet effet

Abrégé

Provided is an EA-DFB laser assembly equipped with an SOA, which enables miniaturization and makes it possible to prevent band deterioration caused by crosstalk between wires. An optical transmitter according to the present disclosure uses an EA-DFB laser assembly, the optical transmitter comprising: an RF line for supplying an electrical signal; an EA-DFB laser chip for converting the electrical signal into an optical signal, the EA-DFB laser chip comprising an LD for oscillating a laser light that constitutes a source of signal light to be emitted, an EA modulator for modulating the intensity of the laser light, an SOA for amplifying the intensity-modulated signal light, and a waveguide for guiding the laser light and the signal light; a first parallel flat plate-type capacitor for removing noise from an electric current supplied to the LD; a second parallel flat plate-type capacitor for removing noise from an electric current supplied to the SOA; and a plurality of wires for electrically connecting the respective elements, wherein the second flat plate-type capacitor is located at a position adjacent to the SOA and the RF line.

Classes IPC  ?

• H01S 5/0239 - Combinaisons d’éléments électriques ou optiques
• H01S 5/026 - Composants intégrés monolithiques, p. ex. guides d'ondes, photodétecteurs de surveillance ou dispositifs d'attaque
• H01S 5/0683 - Stabilisation des paramètres de sortie du laser en surveillant les paramètres optiques de sortie
• H01S 5/50 - Structures amplificatrices non prévues dans les groupes

Abrégé

When M/N (M and N being integers greater than or equal to 1) is set as a conversion rate, a sampling rate converter (12) converts input sampling data sampled at an input sampling rate to output sampling data sampled at an output sampling rate of M/N times the input sampling rate. A digital filter (14) is configured as a plurality of sub-filters F0 to Fω arranged in parallel, in each of which a tap coefficient is set according to the conversion rate. According to the conversion rate, a channel selection circuit (13) supplies each item of input sampling data inputted at the input sampling rate to at least one sub-filter of the digital filter (14). A multiplexer (15) outputs the outputs of the plurality of sub-filters F0 to Fω at the output sampling rate as the output sampling data in an order determined according to the conversion rate.

Classes IPC  ?

• H03H 17/00 - Réseaux utilisant des techniques numériques
• H04B 10/516 - Détails du codage ou de la modulation
• H04B 10/61 - Récepteurs cohérents

Abrégé

A data transfer circuit according to the invention includes a memory configured to write data in accordance with a write pointer in synchronization with a first clock, and read out the data in accordance with a readout pointer in synchronization with a second clock, a clock generation circuit configured to generate the second clock by multiplying a reference clock by a rational number N, a frequency error estimation circuit configured to estimate a frequency error between the first clock and the second clock based on a change amount of a pointer difference between the write pointer and the readout pointer, and an adjustment circuit configured to output, as an adjustment multiple ΔN, a value obtained by dividing the estimated frequency error by a frequency of the reference clock. The clock generation circuit generates the second clock by multiplying the reference clock by a rational number (N+ΔN).

Classes IPC  ?

• H04L 7/00 - Dispositions pour synchroniser le récepteur avec l'émetteur
• G06F 5/06 - Procédés ou dispositions pour la conversion de données, sans modification de l'ordre ou du contenu des données maniées pour modifier la vitesse de débit des données, c.-à-d. régularisation de la vitesse

Abrégé

A frame synchronization system (1) according to this invention includes a frame signal generation circuit (20) configured to generate a frame signal including a plurality of first frame signals each including a first frame synchronization signal and a first payload signal, wherein the first frame synchronization signal is formed from at least one symbol and is set with an average amplitude lower than an average amplitude of the first payload signal, and a frame synchronization circuit (60) configured to receive the frame signal via an optical transmission path (70), and detect the first frame synchronization signal from a received signal, wherein the received signal is divided into frames having a symbol length of the first frame signal, coordinate values, on an IQ plane, of the signals at identical symbol positions of the plurality of divided frames are added over the plurality of frames, and a symbol specified by magnitude comparison in the frame based on an addition result is determined as the first frame synchronization signal. Even if a transmission rate is high, it is possible to decrease the probability of erroneous synchronization, thereby shortening the time until frame synchronization is established.

Classes IPC  ?

• H04L 7/06 - Commande de vitesse ou de phase au moyen de signaux de synchronisation les signaux de synchronisation différant des signaux d'information en amplitude, polarité ou fréquence
• H04L 7/00 - Dispositions pour synchroniser le récepteur avec l'émetteur

Abrégé

1p1n24112a212b1p14b411).

Classes IPC  ?

• H01S 5/062 - Dispositions pour commander les paramètres de sortie du laser, p. ex. en agissant sur le milieu actif en faisant varier le potentiel des électrodes

Abrégé

1p211n1in1nin411).

Classes IPC  ?

• H01S 5/062 - Dispositions pour commander les paramètres de sortie du laser, p. ex. en agissant sur le milieu actif en faisant varier le potentiel des électrodes

Abrégé

A light shielding structure of an optical circuit of the present invention uses a part of the structure of the light reception element itself to suppress stray light. A stepped electrode that covers an upper surface and side surface of a first semiconductor layer constituting a light absorption portion of the light reception element is formed at a height substantially equal to that of an optical waveguide in the optical circuit, and the light absorption portion of the light reception element is shielded from stray light by a wall-shaped or column-shaped wiring electrode extending substantially perpendicularly to a surface layer of the optical circuit. The light shielding structure of the present invention uses a part of the configuration of the light reception element, is formed integrally with the light reception element, and also has an aspect of the invention of the light reception element.

Classes IPC  ?

• H01L 31/0224 - Electrodes
• H01L 31/0232 - Dispositifs à semi-conducteurs sensibles aux rayons infrarouges, à la lumière, au rayonnement électromagnétique d'ondes plus courtes, ou au rayonnement corpusculaire, et spécialement adaptés, soit comme convertisseurs de l'énergie dudit rayonnement e; Procédés ou appareils spécialement adaptés à la fabrication ou au traitement de ces dispositifs ou de leurs parties constitutives; Leurs détails - Détails Éléments ou dispositions optiques associés au dispositif
• H01L 31/105 - Dispositifs sensibles au rayonnement infrarouge, visible ou ultraviolet caractérisés par une seule barrière de potentiel ou de surface la barrière de potentiel étant du type PIN

Abrégé

A connection circuit (10) according to the present invention is connected to the front end of a transmission circuit (12) and receives a baseband signal. The connection circuit (10) is provided with: a separating element (105) connected between an input terminal (111) and an output terminal (112); a signal mid-point detecting unit (103) connected in parallel with the separating element; a bias adding unit (104) connected in series to the signal mid-point detecting unit; and a voltage initial value detecting circuit (102) connected to the frame detecting circuit (101). The voltage initial value detecting circuit holds a voltage initial value of a baseband signal by means of a signal of the frame detecting circuit, and outputs the voltage initial value to the signal mid-point detecting unit. The signal mid-point detecting unit detects a mid-point voltage from the baseband signal and the voltage initial value, and outputs the mid-point voltage to the bias adding unit. The bias adding unit adds the mid-point voltage to a bias voltage for biasing the baseband signal.　Thus, the present invention can provide a connection circuit that delivers a baseband signal having a reduced waveform distortion to a transmission circuit.

Classes IPC  ?

• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs
• H03K 19/0175 - Dispositions pour le couplageDispositions pour l'interface

Abrégé

This connection circuit (10) is connected to the front of a transmission circuit (14) to which a data signal is inputted, and comprises an initial voltage value holding unit (101) and a terminating load (102) connected in series to the initial voltage value holding unit (101), the initial voltage value holding unit (101) outputting, to the terminating load (102), an initial voltage value at the time a data signal is not yet inputted, and rendering the potentials at both ends of the terminating load (102) identical with a direct-current component.　The present invention is thereby made possible to provide a connection circuit that suppresses the direct-current component flowing from the source of data to the terminating load at the front of the transmission circuit.

Classes IPC  ?

• H04L 25/06 - Moyens pour rétablir le niveau à courant continuCorrection de distorsion de polarisation
• H04L 25/02 - Systèmes à bande de base Détails

Abrégé

This transmission interface (10) having a plurality of transmitters (101_1 to 101-N), wherein the transmitters are provided with: a power supply terminal (151) shared by the plurality of transmitters, to which a ground voltage is inputted; a bias terminal (152) to which a bias voltage is inputted; signal terminals (153_1 to 153_N) to which a signal voltage is inputted; a power supply change-inverted bias unit (111) to which a ground voltage and a bias voltage are applied, and which outputs the ground voltage making its change 180 degrees out of phase; a modulation unit (13) to which the output of the power supply change-inverted bias unit and a signal voltage are applied, and which outputs the opposite-phase ground voltage making its change in phase; and a laser diode (14) to which the ground voltage and the output of the modulation unit are applied.　The present invention is thereby made possible to provide a transmission interface that suppresses a change of the voltage applied to the laser diode.

Classes IPC  ?

• H04B 10/516 - Détails du codage ou de la modulation
• G06F 1/26 - Alimentation en énergie électrique, p. ex. régulation à cet effet
• H04B 15/00 - Suppression ou limitation du bruit ou des interférences

Abrégé

The present invention provides an amplification circuit (10) for amplifying a baseband signal, the amplification circuit comprising: an amplification unit (106) connected to an isolating element (105); a signal midpoint detecting unit (103) connected in parallel with the isolating element; a bias adding unit (104) connected in series with the signal midpoint detecting unit; and a voltage initial value detecting circuit (102) connected to the frame detecting circuit (101). The voltage initial value detecting circuit holds a voltage initial value of the baseband signal using a signal from the frame detecting circuit, and outputs the voltage initial value to the signal midpoint detecting unit. The signal midpoint detecting unit detects a midpoint voltage from the baseband signal and the voltage initial value, and outputs the midpoint voltage to the bias adding unit. The bias adding unit adds the midpoint voltage to a bias voltage for biasing the baseband signal. The amplification unit amplifies the baseband signal.　Thus, the present invention provides an amplification circuit that amplifies and accurately delivers a baseband signal including a DC component.

Classes IPC  ?

• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs
• H04B 1/16 - Circuits
• H04L 25/06 - Moyens pour rétablir le niveau à courant continuCorrection de distorsion de polarisation

Abrégé

Part of compensation of the transmission characteristics of the optical transmitter is performed by transmitter compensation circuitry disposed at a stage prior to the optical transmitter. Remaining part of compensation of the transmission characteristics of the optical transmitter and compensation of the transmission characteristics of the optical receiver is performed by a receiver compensation circuitry disposed at a stage subsequent to the optical receiver. Transmitter compensation characteristics of the transmitter compensation circuitry is set so that a peak-to-average-power ratio of an output signal from the transmitter compensation circuitry becomes equal to or smaller than a predetermined value.

Classes IPC  ?

• H04B 10/2507 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion
• H04B 10/079 - Dispositions pour la surveillance ou le test de systèmes de transmissionDispositions pour la mesure des défauts de systèmes de transmission utilisant un signal en service utilisant des mesures du signal de données
• H04B 10/58 - Compensation pour sortie d’émetteur non linéaire

Abrégé

An error correction circuit (20) according to the present invention includes: a first error correction processing circuit (21) which performs error correction processing in a row direction with respect to array data for which first encoding has been performed relative to the row direction; an error detection processing circuit (26) which performs error detection processing in a column direction with respect to the array data for which second encoding has been performed relative to the column direction; a correction bit likelihood calculation circuit (24) which refers to a bit corrected by the first error correction processing circuit (21) as a correction bit, and calculates the sum of likelihoods of the correction bits for each row; a high-likelihood row detection circuit (25) which detects rows of the array data in descending order of the sum of likelihoods of the correction bits for each row, which has been output from the correction bit likelihood calculation circuit (24); and a second error correction processing circuit (27) which corrects a bit where a column in which an error has been detected by the error detection processing circuit (26) intersects the row detected by the high-likelihood row detection circuit (25). The present invention can provide an error correction circuit capable of improving transmission characteristics while suppressing the circuit size.

Classes IPC  ?

• H03M 13/29 - Codage, décodage ou conversion de code pour détecter ou corriger des erreursHypothèses de base sur la théorie du codageLimites de codageMéthodes d'évaluation de la probabilité d'erreurModèles de canauxSimulation ou test des codes combinant plusieurs codes ou structures de codes, p. ex. codes de produits, codes de produits généralisés, codes concaténés, codes interne et externe
• H03M 13/19 - Correction d'une seule erreur sans utiliser les propriétés particulières des codes cycliques, p. ex. codes de Hamming, codes de Hamming étendus ou généralisés
• H04L 1/00 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue

Abrégé

Ensuring that a control program of a programmable electronic component included in an optical module updatable as well while a control program of a microprocessor included in the optical module is in operation. A module that functions by causing an electronic component to operate, a microprocessor located in the module and coupled to a host device via communicating device uses data in the S-record format downloaded from the host device using the communicating device to update a control program of the electronic component.

Classes IPC  ?

• G06F 8/65 - Mises à jour
• G06F 9/4401 - Amorçage

Abrégé

An optical module of a configuration that ensures use of commercially available electronic components and reduction of the number of current generation circuits and electric wirings. The optical module includes an electronic component mounted on a separate board from a light wave circuit board provided with an optical component such as an optical switch, and they are each electrically connected by wire bonding. For this reason, the optical module can use a commercially available electronic component. In addition, the module has a configuration in which heaters of optical switches, which do not simultaneously flow currents, are grouped and a current from one current generation circuit is supplied to any one of the heaters in the group by means of one electrical switch. For this reason, the optical module does not have to be prepared with the same number of electrical switches and current generation circuits as the number of heaters.

Classes IPC  ?

• G02F 1/313 - Dispositifs de déflexion numérique dans une structure de guide d'ondes optique
• G02B 6/35 - Moyens de couplage optique comportant des moyens de commutation
• H04Q 11/00 - Dispositifs de sélection pour systèmes multiplex
• G02F 1/31 - Dispositifs de déflexion numérique

Abrégé

The data transfer circuit (40) according to the present invention comprises: a reading memory (41) for writing data in accordance with a writing pointer in synchronization with a first clock and reading data in accordance with a reading pointer in synchronization with a second clock; a clock generation circuit (44) for multiplying a reference clock by a rational number of N to generate a second clock; a frequency error estimation circuit (42) for estimating, on the basis of a change amount of a pointer difference between the writing pointer and the reading pointer, a frequency error between the first clock and the second clock; and an adjustment circuit (43) for outputting a value obtained by dividing the estimated frequency error by a frequency of the reference clock as an adjustment multiple ΔN. The clock generation circuit (44) uses the adjustment multiple ΔN output by the adjustment circuit (43) and multiplies the reference clock by a rational number of (N+ΔN) to generate a second clock. The present invention thus can provide a data transfer circuit capable of increasing the speed of clock synchronization.

Classes IPC  ?

• H04L 7/033 - Commande de vitesse ou de phase au moyen des signaux de code reçus, les signaux ne contenant aucune information de synchronisation particulière en utilisant les transitions du signal reçu pour commander la phase de moyens générateurs du signal de synchronisation, p. ex. en utilisant une boucle verrouillée en phase
• H04L 7/00 - Dispositions pour synchroniser le récepteur avec l'émetteur

Abrégé

A tap coefficient control circuit (12) sets tap coefficients which are updated by a second tap coefficient updater (11) as initial values for a convergence operation of tap coefficients of a first digital filter (13) updated by a first tap coefficient updater (14), arranges the tap coefficients set as initial values in descending order of the degree of contribution of the convergence operation of the first tap coefficient updater (14), determines that tap coefficients greater than or equal to an upper designated number are valid and tap coefficients less than the designated number are invalid, and sets the tap coefficients of the first digital filter (13) corresponding to the tap coefficients determined to be invalid to zero until the next determination result comes out, preventing use thereof in calculations by the first tap coefficient updater (14).

Classes IPC  ?

• H03H 21/00 - Réseaux adaptatifs
• H04J 11/00 - Systèmes multiplex orthogonaux
• H04B 3/06 - Réglage de la transmissionÉgalisation par le signal transmis
• H04L 27/01 - Égaliseurs
• H04B 10/2507 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion

Abrégé

First compensation circuitry includes a first digital filter compensating a phase difference between a phase of a symbol of a received signal and a sampling timing, and first filter coefficient calculation circuitry calculating a filter coefficient of the first digital filter as a first filter coefficient. Second filter coefficient calculation circuitry calculates, as a second filter coefficient, a filter coefficient for adaptive equalization that compensates distortion due to temporally changing polarization dispersion, based on an output of the first digital filter. Coefficient combination circuitry combines the first filter coefficient and the second filter coefficient. Second compensation circuitry includes a second digital filter which uses a filter coefficient combined by the coefficient combination circuitry and performs a compensation of the phase difference between the phase of the symbol of the received signal and the sampling timing, and a process of the adaptive equalization at the same time.

Classes IPC  ?

• H04B 10/2507 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion
• H04B 10/2569 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion due à la dispersion modale de polarisation [PMD]
• H04B 10/61 - Récepteurs cohérents

Abrégé

A frame synchronization system (1) of the present invention comprises: a frame signal generating circuit (20) for generating a frame signal including a plurality of first frame signals including a first frame synchronization signal and a first payload signal, the first frame synchronization signal consisting of at least one symbol and having a mean amplitude set lower than the first payload signal; and a frame synchronization circuit (60) for receiving the frame signal via an optical transmission path (70), detecting the first frame synchronization signal from the received signal, dividing the received signal into frames of a symbol length of the first frame signal, adding the coordinate values on an IQ plane of the signals at the same symbol position of a plurality of the divided frames, over the plurality of frames, and determining that a symbol identified by size comparison in the frames on the basis of a result of the addition is the first frame synchronization signal. Even in the case of a high transmission rate, the probability of erroneous synchronization can be decreased, and the time before frame synchronization can be reduced.

Classes IPC  ?

• H04L 7/06 - Commande de vitesse ou de phase au moyen de signaux de synchronisation les signaux de synchronisation différant des signaux d'information en amplitude, polarité ou fréquence
• H04L 27/34 - Systèmes à courant porteur à modulation de phase et d'amplitude, p. ex. en quadrature d'amplitude

Abrégé

A process of estimating a transfer function or an inverse transfer function of the optical transmitter from first data obtained by the optical receiver when a first known signal is transmitted from the transmitter to the receiver, and a temporary transfer function or a temporary inverse transfer function of the optical receiver, is performed for multiple frequency offsets between the optical transmitter and the optical receiver. At this time, the transfer function or the inverse transfer function of the optical transmitter is estimated by comparing the first data obtained by compensating at least one or none of a temporary transfer function of the optical receiver and transmission path characteristics detected in the receiver, with a first known signal before transmission to which what is not compensated for the first data between the temporary transfer function of the optical receiver and the transmission path characteristic is added.

Classes IPC  ?

• H04B 10/071 - Dispositions pour la surveillance ou le test de systèmes de transmissionDispositions pour la mesure des défauts de systèmes de transmission utilisant un signal réfléchi, p. ex. utilisant des réflectomètres optiques temporels [OTDR]
• H04B 10/50 - Émetteurs
• H04B 10/588 - Compensation pour sortie d’émetteur non linéaire dans les systèmes de modulation externe
• H04B 10/61 - Récepteurs cohérents

Abrégé

A frame synchronization apparatus (10) according to this invention includes a multiplication unit (11) configured to multiply a received signal by an inverse complex number of a predetermined synchronization pattern with respect to a predetermined signal point on a complex space diagram for each of a plurality of symbols of the received signal, an addition average unit (12) configured to perform addition averaging of outputs from the multiplication unit for the plurality of symbols of the received signal, and a synchronization determination unit (13) configured to perform coincidence determination of whether an output from the addition average unit (12) falls within a predetermined coincidence determination range of the predetermined signal point, and determine a synchronization state of the frame synchronization based on a result of the coincidence determination. According to this invention, it is possible to provide a frame synchronization apparatus that correctly determines a synchronization state even if an error rate of received symbols is high.

Classes IPC  ?

• H04L 7/00 - Dispositions pour synchroniser le récepteur avec l'émetteur
• H04L 7/04 - Commande de vitesse ou de phase au moyen de signaux de synchronisation
• H04L 27/227 - Circuits de démodulationCircuits récepteurs utilisant une démodulation cohérente
• H04B 10/556 - Modulation numérique, p. ex. modulation par déplacement de phase différentielle [DPSK] ou modulation par déplacement de fréquence [FSK]
• H04B 10/61 - Récepteurs cohérents

Abrégé

An optical device manufacturing method and an optical device manufacturing apparatus that use local etching, and are characterized in that during a wafer process for manufacturing a waveguide-type optical device structured from a cladding and a light-propagating core, a nozzle that performs etching locally is used and made to move, and a slanted end surface slanted at an arbitrary angle, a curved surface-shaped end surface, and a core with a varying film thickness are formed in arbitrary locations of the wafer. Using local etching, the slanted end surface is formed in an optical waveguide end section to achieve, for example, a 45° reflective mirror or a light-condensing non-planar reflective mirror, and a film thickness-controlled core is achieved, and thus highly efficient optical connection is achieved.

Classes IPC  ?

• H01L 21/3065 - Gravure par plasmaGravure au moyen d'ions réactifs
• G02B 6/136 - Circuits optiques intégrés caractérisés par le procédé de fabrication par gravure

Abrégé

A frame synchronization apparatus (10) according to this invention includes a multiplication unit (11) configured to multiply a received signal by an inverse complex number of a predetermined synchronization pattern with respect to a predetermined signal point on a complex space diagram for each of a plurality of symbols of the received signal, an addition average unit (12) configured to perform addition averaging of outputs from the multiplication unit for the plurality of symbols of the received signal, and a synchronization determination unit (13) configured to perform coincidence determination of whether an output from the addition average unit (12) falls within a predetermined coincidence determination range of the predetermined signal point, and determine a synchronization state of the frame synchronization based on a result of the coincidence determination. According to this invention, it is possible to provide a frame synchronization apparatus that correctly determines a synchronization state even if an error rate of received symbols is high.

Classes IPC  ?

• H04B 10/00 - Systèmes de transmission utilisant des ondes électromagnétiques autres que les ondes hertziennes, p. ex. les infrarouges, la lumière visible ou ultraviolette, ou utilisant des radiations corpusculaires, p. ex. les communications quantiques
• H04L 7/00 - Dispositions pour synchroniser le récepteur avec l'émetteur
• H04B 10/61 - Récepteurs cohérents
• H04B 10/556 - Modulation numérique, p. ex. modulation par déplacement de phase différentielle [DPSK] ou modulation par déplacement de fréquence [FSK]

Abrégé

An error correction device includes a first correction unit which performs error correction decoding of data by a repetitive operation, having a full operation state in which the error correction decoding is repeated until convergence is obtained and a save operation state in which the number of times of the repetitive operation is restricted to a predetermined number. An error information estimation unit estimates an input error rate or an output error rate of the first correction unit using a decoding result of the first correction unit, and a control unit which controls transition between the full operation state and the save operation state based on at least one piece of information of the input error rate, the output error rate, and an operation time of the first correction unit. It is thus possible to provide an error correction device that can improve a transmission characteristic while suppressing power consumption.

Classes IPC  ?

• H04L 1/00 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue
• H04B 10/80 - Aspects optiques concernant l’utilisation de la transmission optique pour des applications spécifiques non prévues dans les groupes , p. ex. alimentation par faisceau optique ou transmission optique dans l’eau
• H04B 10/61 - Récepteurs cohérents
• H03M 13/47 - Détection d'erreurs, correction d'erreurs transmises ou protection contre les erreurs, non prévues dans les groupes

Abrégé

The present invention provides a packaging type for optical fibers having at least one end. The optical fiber is housed and packaged in a package having: a holding section that holds the optical fiber in a wound state; and a removal section having part thereof that gets deformed or removed. In this packaging type, the package: can house single optical fibers having a prescribed length and having both ends; and can also house optical fibers having one end thereof connected to an optical circuit such as an optical module, etc., to a connector etc. Optical fibers housed in the package can be a single strand or can be a plurality of strands of optical fiber. An optical connector can be connected to an end of the housed optical fiber. A connector having a plurality of optical fibers lined up in an array can be connected to the end thereof.

Classes IPC  ?

• B65D 75/62 - Encoches ou perforations, p. ex. dans les coutures de fermeture
• B65D 85/02 - Réceptacles, éléments d'emballage ou paquets spécialement adaptés à des objets ou à des matériaux particuliers pour des objets de forme annulaire
• B65D 85/38 - Réceptacles, éléments d'emballage ou paquets spécialement adaptés à des objets ou à des matériaux particuliers pour objets particulièrement sensibles aux dommages par chocs ou compression pour appareils optiques de mesure, de calcul ou de commande délicats
• G02B 6/46 - Procédés ou appareils adaptés à l'installation de fibres optiques ou de câbles optiques

Abrégé

There is provided a small MCS with the number of leads reduced by half as compared with the conventional configuration. A multicast switch according to the present invention is formed on a substrate, comprising: M input ports, N output ports; M×N optical switch units (optical SU); optical waveguides optically connecting the M input ports, M×N optical SU, and N output ports; and leads connected to the respective M×N optical SU. A multicast switch is configured such that by activating one optical SU, an optical signal input to an input port associated with the activated optical SU is output from an output port associated with the activated optical SU. The M×N optical SU include at least a gate switch and a main switch. In each optical SU, the gate switch and the main switch are connected to the common lead.

Classes IPC  ?

• G02B 6/35 - Moyens de couplage optique comportant des moyens de commutation
• G02B 6/12 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage du type guide d'ondes optiques du genre à circuit intégré
• G02F 1/313 - Dispositifs de déflexion numérique dans une structure de guide d'ondes optique

Abrégé

An optical module that has a structure ensuring reduction in size. The optical module has a structure where a part of a fiber block is protruded from a housing. By including a thin plate, this optical module can avoid entering of dust in the housing, allows a position shift of the fiber block due to a mounting position error of an optical component in the housing, a position shift of an opening portion due to a dimensional error of the housing, or a displacement due to a temperature change, and can reduce the coupling loss due to the optical axis misalignment.

Classes IPC  ?

• G02B 6/30 - Moyens de couplage optique pour usage entre fibre et dispositif à couche mince
• G02B 6/42 - Couplage de guides de lumière avec des éléments opto-électroniques
• G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p. ex. câbles de transmission optique

Abrégé

This light shielding structure of an optical circuit suppresses stray light by using a portion of a structure of a light reception element itself in the light reception element that requires a countermeasure against the stray light. A stepped electrode (8) that covers an upper surface and a side surface of a first semiconductor layer (4) constituting a light absorption part of the light reception element is formed at a height substantially equal to that of an optical waveguide (3) in an optical circuit (1), and the optical absorption part of the light reception element is shielded from stray light (12) by a wall-shaped or column-shaped wiring electrode (9) extending substantially perpendicular to the surface layer of the optical circuit (1). The light shielding structure of the present invention uses a partial configuration of the light reception element, is formed integrally with the light reception element, and has an inventive aspect of the light reception element. The wiring electrode (9) having a light shielding function may be configured to extend from the surface layer of the optical circuit (1) to the inside of a substrate (2) beyond the lower surface of the first semiconductor layer (4). Furthermore, the wiring electrode (9) may be continuously formed from the first layer (4) to the surface of the optical circuit (1).

Classes IPC  ?

• H01L 31/0232 - Dispositifs à semi-conducteurs sensibles aux rayons infrarouges, à la lumière, au rayonnement électromagnétique d'ondes plus courtes, ou au rayonnement corpusculaire, et spécialement adaptés, soit comme convertisseurs de l'énergie dudit rayonnement e; Procédés ou appareils spécialement adaptés à la fabrication ou au traitement de ces dispositifs ou de leurs parties constitutives; Leurs détails - Détails Éléments ou dispositions optiques associés au dispositif
• H01L 31/10 - Dispositifs à semi-conducteurs sensibles aux rayons infrarouges, à la lumière, au rayonnement électromagnétique d'ondes plus courtes, ou au rayonnement corpusculaire, et spécialement adaptés, soit comme convertisseurs de l'énergie dudit rayonnement e; Procédés ou appareils spécialement adaptés à la fabrication ou au traitement de ces dispositifs ou de leurs parties constitutives; Leurs détails dans lesquels le rayonnement commande le flux de courant à travers le dispositif, p.ex. photo-résistances caractérisés par au moins une barrière de potentiel ou une barrière de surface, p.ex. photo-transistors
• G02B 6/12 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage du type guide d'ondes optiques du genre à circuit intégré

Abrégé

00; a state-of-polarization estimator (74) that estimates a state of polarization of the reception signal (61) by using the tap coefficient calculated by the second tap coefficient updater (73); and a step size updater (75) that obtains the step size corresponding to the state of polarization estimated by the state-of-polarization estimator (74) and updates the variable step size. The present invention can provide the adaptive equalizer that achieves always stable followability for various types of SOP fluctuation.

Classes IPC  ?

• H04B 3/04 - Réglage de la transmissionÉgalisation
• H04B 3/06 - Réglage de la transmissionÉgalisation par le signal transmis
• H04B 10/2507 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion
• H04B 10/61 - Récepteurs cohérents

Abrégé

A binary arithmetic device includes an LPS/MPS determining unit that determines, using a context variable, a range length, and an offset, whether a code is an inferior probability code or a superior probability code, a renormalization processing unit that performs renormalization processing on the range length and the offset, and a context-variable calculating unit that derives the binary data of the code using a determination result and updates the context variable according to the determination result. The renormalization processing unit 15 includes a first renormalizing unit and a second renormalizing unit and a selecting unit that selects, according to the determination result, an output of the first renormalizing unit or an output of the second renormalizing unit.

Classes IPC  ?

• H04N 19/13 - Codage entropique adaptatif, p. ex. codage adaptatif à longueur variable [CALV] ou codage arithmétique binaire adaptatif en fonction du contexte [CABAC]
• H04N 19/149 - Débit ou quantité de données codées à la sortie du codeur par estimation de la quantité de données codées au moyen d’un modèle, p. ex. un modèle mathématique ou un modèle statistique
• H04N 19/184 - Procédés ou dispositions pour le codage, le décodage, la compression ou la décompression de signaux vidéo numériques utilisant le codage adaptatif caractérisés par l’unité de codage, c.-à-d. la partie structurelle ou sémantique du signal vidéo étant l’objet ou le sujet du codage adaptatif l’unité étant des bits, p. ex. de flux vidéo compressé
• H04N 19/44 - Décodeurs spécialement adaptés à cet effet, p. ex. décodeurs vidéo asymétriques par rapport à l’encodeur
• G06F 17/18 - Opérations mathématiques complexes pour l'évaluation de données statistiques

Abrégé

A broadband optical wavelength multiplexer/demultiplexer is provided. Two waveguides are arranged such that, in a case where a connection position where one of the two waveguides is connected to a first slab waveguide is set closer to the other waveguide by a channel frequency interval Δf, a central position between the two waveguides aligns with a central position on a connection end surface of the first slab waveguide, and two waveguide groups of an output waveguide are arranged such that a central position between the two waveguide groups aligns with a central position of a second slab waveguide, and an interval between a connection position where the other waveguide is connected to the first slab waveguide and the central position on the connection end surface of the first slab waveguide is set equal to an interval between a connection position where the waveguide groups are connected to the second slab waveguide.

Classes IPC  ?

• G02B 6/12 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage du type guide d'ondes optiques du genre à circuit intégré

Abrégé

Part of compensation of the transmission characteristics of an optical transmitter (3) is performed in a transmitter compensating unit (8) disposed in a stage preceding the optical transmitter (3). The rest of compensation of the transmission characteristics of the optical transmitter (3), and compensation of the transmission characteristics of an optical receiver (5) are performed in a receiver compensating unit (12) disposed in a stage following the optical receiver (5). Transmitter compensation characteristics of the transmitter compensating unit (8) are set so that a peak-to-mean power ratio of an output signal of the transmitter compensating unit (8) becomes less than or equal to a predetermined value.

Classes IPC  ?

• H04B 10/079 - Dispositions pour la surveillance ou le test de systèmes de transmissionDispositions pour la mesure des défauts de systèmes de transmission utilisant un signal en service utilisant des mesures du signal de données
• H04B 10/2507 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion
• H04B 10/58 - Compensation pour sortie d’émetteur non linéaire

Abrégé

Processing for estimating a transfer or inverse transfer function of an optical transmitter (7) from first data in which an optical receiver (9) received a first known signal when a transmission unit (1) transmits the first known signal to a reception unit (3) and from a provisional transfer or inverse transfer function of the optical receiver (9) is executed with respect to each of a plurality of frequency offsets between the optical transmitter (7) and the optical receiver (9). In the processing, the first data which compensates at least one or none of a transmission path characteristic detected by the reception unit (3) and the provisional transfer function of the optical receiver (9) is compared with a pre-transmission first known signal to which is added one among the transmission path characteristic and the provisional transfer function of the optical receiver (9) not compensated by the first data, and the transfer function or the inverse transfer function of the optical transmitter is estimated. By averaging the transfer function or the inverse transfer function of the optical transmitter (7) estimated with respect to the plurality of frequency offsets, or by expressing an exponential function by averaging a phase characteristic ϕ (s) of the transfer function and the inverse transfer function, an average transfer function or an average inverse transfer function of the optical transmitter (7) is obtained.

Classes IPC  ?

• H04B 10/073 - Dispositions pour la surveillance ou le test de systèmes de transmissionDispositions pour la mesure des défauts de systèmes de transmission utilisant un signal hors service
• H04B 10/588 - Compensation pour sortie d’émetteur non linéaire dans les systèmes de modulation externe
• H04B 10/61 - Récepteurs cohérents
• H04J 11/00 - Systèmes multiplex orthogonaux
• H04L 27/01 - Égaliseurs

Abrégé

The objective of the present disclosure is to enable updating of a control program of a programmable electronic component included in an optical module while a control program of a microprocessor included in the optical module is operating. The present disclosure is a module 112 that functions by operating an electronic component 122, wherein a microprocessor 121, which is inside the module 112 and is connected to a higher-order device 111 via a communication means, uses data that is in a S-record format and has been downloaded from the higher-order device 111 by the communication means to update a control program of the electronic component 122.

Classes IPC  ?

• G06F 8/656 - Mises à jour pendant le fonctionnement

Abrégé

The objective of the present disclosure is to enable updating of a control program of a programmable electronic component included in an optical module while a control program of a microprocessor included in the optical module is operating. The present disclosure is a module 112 that functions by operating an electronic component 122, wherein a microprocessor 121, which is inside the module 112 and is connected to a higher-order device 111 via a communication means, uses data that is in a S-record format and has been downloaded from the higher-order device 111 by the communication means to update a control program of the electronic component 122.

Classes IPC  ?

• G06F 8/656 - Mises à jour pendant le fonctionnement

Abrégé

The purpose of the present invention is to provide an optical module of a configuration in which a commercially available electronic component can be used, and the number of current generation circuits and electric wirings can be reduced. The optical module according to the present invention has an electronic component mounted on a separate board from a light wave circuit board provided with an optical component such as an optical switch, and is electrically connected by wire bonding with the separate board and the light wave circuit board. For this reason, the present optical module can use a commercially available electronic component. In addition, the present module has a configuration in which heaters of optical switches, which do not simultaneously flow currents, are grouped and a current from one current generation circuit is supplied to any one of the heaters in the group by means of one electric switch. For this reason, the present optical module does not have to be prepared with the same number of electrical switches and current generation circuits as the number of heaters.

Classes IPC  ?

• G02F 1/313 - Dispositifs de déflexion numérique dans une structure de guide d'ondes optique
• H04B 10/80 - Aspects optiques concernant l’utilisation de la transmission optique pour des applications spécifiques non prévues dans les groupes , p. ex. alimentation par faisceau optique ou transmission optique dans l’eau

Abrégé

The purpose of the present invention is to provide an optical device with which the mounting and wiring of components can easily be achieved without increasing the size of the device, and which can reduce the effects of interference and heat on the electromagnetic fields between components. One embodiment of this optical module uses a method in which, in order to mount components in a narrow mounting space inside a CAN package, an optical semiconductor element 13 is mounted directly above an electronic circuit 11. The mounting of the optical semiconductor element 13 directly above the electronic circuit 11 eliminates the need to ensure a certain surface area on a substrate 10 on which to place the optical semiconductor element 13, and makes it possible to ensure sufficient space for mounting other constituent components. In addition, because a space is opened up between constituent components, component mounting and wiring work are made easier. Moreover, the extension of the mountable space makes it possible for the positions of the optical semiconductor element 13 and the electronic circuit 11 to be adjusted, and results in a greater degree of freedom in optical and electrical design.

Classes IPC  ?

• H01L 31/02 - Dispositifs à semi-conducteurs sensibles aux rayons infrarouges, à la lumière, au rayonnement électromagnétique d'ondes plus courtes, ou au rayonnement corpusculaire, et spécialement adaptés, soit comme convertisseurs de l'énergie dudit rayonnement e; Procédés ou appareils spécialement adaptés à la fabrication ou au traitement de ces dispositifs ou de leurs parties constitutives; Leurs détails - Détails
• H01S 5/022 - SupportsBoîtiers

Abrégé

In the present invention, a first compensation section (1) has: a first digital filter (2) for compensating a phase difference between a phase of a symbol in a received signal and sampling timing; and a first filter coefficient calculation unit (4) for calculating a filter coefficient of the first digital filter (2) as a first filter coefficient. A second filter coefficient calculation unit (5) calculates, as a second filter coefficient, a filter coefficient for adaptive equalization by compensating distortion due to temporally fluctuating polarization dispersion on the basis of an output from the first digital filter (2). A coefficient synthesis unit (6) synthesizes the first filter coefficient with the second filter coefficient. A second compensation unit (7) has a second digital filter for simultaneously carrying out the compensation processing of the phase difference between the phase of the symbol in the received signal and the sampling timing and the adaptive equalization processing by using the synthesized filter coefficient from the coefficient synthesis unit (6).

Classes IPC  ?

• H04B 10/2507 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion
• H04B 3/06 - Réglage de la transmissionÉgalisation par le signal transmis
• H04B 10/61 - Récepteurs cohérents

Abrégé

A predicted image generation unit (17) intra-prediction encodes a pixel block included in the first pixel block group of the first picture in a refresh period, and inter-prediction encodes a pixel block included in the n-th pixel block group (an area to which the (n −1)th pixel block group is extended) of the n-th picture (where n > 1) in the refresh period with only a pixel block included in the m-th pixel block group of the m-th picture (where m < n) being regarded as a referenceable one.

Classes IPC  ?

• H04N 19/107 - Sélection du mode de codage ou du mode de prédiction entre codage prédictif spatial et temporel, p. ex. rafraîchissement d’image
• H04N 19/167 - Position dans une image vidéo, p. ex. région d'intérêt [ROI]
• H04N 19/174 - Procédés ou dispositions pour le codage, le décodage, la compression ou la décompression de signaux vidéo numériques utilisant le codage adaptatif caractérisés par l’unité de codage, c.-à-d. la partie structurelle ou sémantique du signal vidéo étant l’objet ou le sujet du codage adaptatif l’unité étant une zone de l'image, p. ex. un objet la zone étant une tranche, p. ex. une ligne de blocs ou un groupe de blocs

Abrégé

This optical signal processing device has an optical waveguide formed on a substrate, and the optical waveguide has at least one input port and at least one output port, and also a plurality of driven elements that include a phase shifter for applying a phase shift to the optical signals input from the input port. Each of the driven elements has at least two control terminals, has control wiring for applying time-division synchronized control signals between the two control terminals, and the control wiring for accessing the driven elements is shared by the plurality of driven elements. This optical signal processing device reduces electrical wiring in optical signal processing devices realized by using an optical waveguide, such as optical switches and optical filters.

Classes IPC  ?

• G02F 1/313 - Dispositifs de déflexion numérique dans une structure de guide d'ondes optique

Abrégé

A band division timing adjustment unit aligns timings of a plurality of signals, which are generated by dividing a received signal according to a plurality of frequency bands, in a time domain and combines the plurality of signals for which the timings have been aligned. A chromatic dispersion compensation unit compensates chromatic dispersion of an output signal of the band division timing adjustment unit for each of the plurality of frequency bands.

Classes IPC  ?

• H04B 10/2513 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion due à la dispersion chromatique
• H04B 10/61 - Récepteurs cohérents
• H04B 10/079 - Dispositions pour la surveillance ou le test de systèmes de transmissionDispositions pour la mesure des défauts de systèmes de transmission utilisant un signal en service utilisant des mesures du signal de données
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples

Abrégé

An optical circuit board which is mounted with a loop-back circuit for returning aligning light to the fiber array in the vicinity of the fiber array connection end. Since an aligning loop-back circuit can be formed in an optical waveguide pattern, a production cost does not increase in comparison to an optical circuit board of the related art. The aligning light combined from the optical fiber to the aligning port of the optical circuit board is returned to the optical fiber around the loop-back circuit. Therefore, it is possible to perform alignment using the returned light. That is, alignment can be performed while being mounted on a package without installing a light-reflecting film or mirror.

Classes IPC  ?

• G02B 6/30 - Moyens de couplage optique pour usage entre fibre et dispositif à couche mince
• G02B 6/122 - Éléments optiques de base, p. ex. voies de guidage de la lumière
• G02B 6/132 - Circuits optiques intégrés caractérisés par le procédé de fabrication par le dépôt de couches minces

Abrégé

A method estimating transmission characteristics of an optical transmitter of a transmission unit and an optical receiver of a reception unit, including: estimating a temporary transfer or inverse transfer function of the optical receiver; estimating a transfer or inverse transfer function of the optical transmitter from first data acquired by the reception unit when a first known signal is transmitted from the transmission unit, and the estimated temporary transfer or inverse transfer function of the optical receiver, a difference between the first known signal and an original first known signal is minimized; and estimating a transfer or inverse transfer function of the optical receiver from second data acquired by the reception unit when a second known signal is transmitted from the transmission unit, and the estimated transfer or inverse transfer function of the optical transmitter, a difference between the second known signal and an original second known signal is minimized.

Classes IPC  ?

• H04B 10/079 - Dispositions pour la surveillance ou le test de systèmes de transmissionDispositions pour la mesure des défauts de systèmes de transmission utilisant un signal en service utilisant des mesures du signal de données
• H04B 10/40 - Émetteurs-récepteurs
• H04B 10/61 - Récepteurs cohérents
• H04B 10/00 - Systèmes de transmission utilisant des ondes électromagnétiques autres que les ondes hertziennes, p. ex. les infrarouges, la lumière visible ou ultraviolette, ou utilisant des radiations corpusculaires, p. ex. les communications quantiques
• H04B 17/00 - SurveillanceTests
• H04B 10/50 - Émetteurs
• H04B 10/60 - Récepteurs
• H04B 10/58 - Compensation pour sortie d’émetteur non linéaire
• H04B 10/43 - Émetteurs-récepteurs utilisant un seul composant en tant que source lumineuse et récepteur, p. ex. utilisant un photoémetteur comme photorécepteur
• H04B 10/25 - Dispositions spécifiques à la transmission par fibres

Abrégé

A known pattern comparison-type phase difference detection unit (12) detects, as a first phase difference, a phase difference between a known pattern extracted from a reception signal and a true value of the known pattern. The number of modulation phases in a phase modulation scheme of the reception signal is M, and an M-th power-type phase difference detection unit (13) raises the reception signal to an M-th power to remove a modulation component, and detects, as a second phase difference, a phase variation from a mapping modulation phase point on the transmission side. A phase compensation unit (11) compensates for the phase variation in the reception signal on the basis of the result of summing the first phase difference and the second phase difference.

Classes IPC  ?

• H04B 10/61 - Récepteurs cohérents
• H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs

Abrégé

A plurality of error correction circuits corrects errors of the data transmitted through the plurality of transmission lines. A combining portion combines the plurality of transmission lines to the plurality of error correction circuits. The plurality of transmission lines includes a first transmission line, and a second transmission line having a lower transmission characteristic than the first transmission line. The plurality of error correction circuits includes a first and a second error correction circuit having lower error correction capability and power consumption than the first error correction circuit. The combining portion uses a function to combine a plurality of error correction circuits with one transmission path, combines the first transmission line with the second error correction circuit at a higher rate than the first error correction circuit, and combines the second transmission line with the first error correction circuit at a higher rate than the second error correction circuit.

Classes IPC  ?

• H04L 12/26 - Dispositions de surveillance; Dispositions de test
• H03M 13/29 - Codage, décodage ou conversion de code pour détecter ou corriger des erreursHypothèses de base sur la théorie du codageLimites de codageMéthodes d'évaluation de la probabilité d'erreurModèles de canauxSimulation ou test des codes combinant plusieurs codes ou structures de codes, p. ex. codes de produits, codes de produits généralisés, codes concaténés, codes interne et externe
• H04L 5/00 - Dispositions destinées à permettre l'usage multiple de la voie de transmission
• H04L 5/02 - Canaux caractérisés par le type de signal
• H04N 21/2383 - Codage de canal d'un flux binaire numérique, p. ex. modulation

Abrégé

An amplifier typically exemplified by a TIA is realized that provides an optimal band characteristic, that reduces the possibility of the oscillation, and that achieves a reduced dispersion of the band characteristics. An amplifier for amplifying an electric signal, comprising: a first buffer for amplifying the electric signal; a filter that is connected to an output of the first buffer and that includes a parallel circuit consisting of an inductor and a first capacity; and a second buffer connected to an output of the filter.

Classes IPC  ?

• H03F 1/08 - Modifications des amplificateurs pour réduire l'influence défavorable de l'impédance interne des éléments amplificateurs
• H04B 10/69 - Dispositions électriques dans le récepteur

Abrégé

This frame synchronization device (10) is equipped with: a multiplication unit (11) which, for each of a plurality of symbols of a received signal, multiplies the received signal by the inverse complex number of a prescribed synchronization pattern for a prescribed signal point on a complex space diagram; an arithmetic mean unit (12) for obtaining the arithmetic mean of the output of the multiplication unit for the plurality of symbols of the received signal; and a synchronization determination unit (13) for determining whether or not the output of the arithmetic mean unit (12) matches a prescribed matching range of the prescribed signal point, and on the basis of the matching results, determining the synchronization state of the frame synchronization. The present invention makes it possible to provide a frame synchronization device which correctly determines the synchronization state even when the received symbol error rate is high.

Classes IPC  ?

• H04L 27/227 - Circuits de démodulationCircuits récepteurs utilisant une démodulation cohérente
• H04L 7/04 - Commande de vitesse ou de phase au moyen de signaux de synchronisation

Abrégé

The present invention rapidly performs parallel encoding of split videos. This video encoding apparatus 1 is provided with: a plurality of encoding devices 12 for encoding a plurality of split videos, respectively; and a packet switch device 13 connected to the plurality of encoding devices 12. A master device 12A, which is one of the plurality of encoding devices 12, outputs to the packet switch device 13 an encoding parameter used to encode the split videos in the plurality of encoding devices 12, and encodes the split videos into encoded data by using the encoding parameter for the local device. The packet switch device 13 transmits the encoding parameter output by the master device 12A to each of a plurality of slave devices 12B-12D. Each of the plurality of slave devices 12B-12D receives the encoding parameter from the packet switch device 13 and encodes the split videos into encoded data by using the encoding parameter for the local device.

Classes IPC  ?

• H04N 19/436 - Procédés ou dispositions pour le codage, le décodage, la compression ou la décompression de signaux vidéo numériques caractérisés par les détails de mise en œuvre ou le matériel spécialement adapté à la compression ou à la décompression vidéo, p. ex. la mise en œuvre de logiciels spécialisés utilisant des dispositions de calcul parallélisées
• H04N 19/46 - Inclusion d’information supplémentaire dans le signal vidéo pendant le processus de compression

Abrégé

An optical module that is connectable to an optical fiber array and that can be packaged in a high density. Two package modules are mounted on a board, and optical waveguides in a Si photonic lightwave circuit mounted on the package module are connected to an optical fiber array fixed to an optical fiber block. Moreover, output end surfaces of the optical waveguides in the Si photonic lightwave circuit are perpendicular to a mount surface of the package module. The optical waveguides in the Si photonic lightwave circuit may be tilted at an appropriate angle with respect to a direction perpendicular to a right end surface. Moreover, the optical fiber block fixes optical fibers with the optical fibers tilted with respect to a direction perpendicular to an end surface connected to the Si photonic lightwave circuit.

Classes IPC  ?

• G02B 6/30 - Moyens de couplage optique pour usage entre fibre et dispositif à couche mince

Abrégé

A computation unit subtracts a prediction image from an input image. An orthogonal transformation unit applies orthogonal transformation to an output of the computation unit. A quantization unit quantizes an output of the orthogonal transformation unit. An encoding unit encodes an output of the quantization unit. A prediction mode determination unit determines a prediction mode from the input image. The prediction mode is different according to types of an I-picture, a P-picture and a B-picture.

Classes IPC  ?

• H04N 19/00 - Procédés ou dispositions pour le codage, le décodage, la compression ou la décompression de signaux vidéo numériques
• H04N 19/593 - Procédés ou dispositions pour le codage, le décodage, la compression ou la décompression de signaux vidéo numériques utilisant le codage prédictif mettant en œuvre des techniques de prédiction spatiale
• H04N 19/176 - Procédés ou dispositions pour le codage, le décodage, la compression ou la décompression de signaux vidéo numériques utilisant le codage adaptatif caractérisés par l’unité de codage, c.-à-d. la partie structurelle ou sémantique du signal vidéo étant l’objet ou le sujet du codage adaptatif l’unité étant une zone de l'image, p. ex. un objet la zone étant un bloc, p. ex. un macrobloc
• H04N 19/159 - Type de prédiction, p. ex. prédiction intra-trame, inter-trame ou de trame bidirectionnelle
• H04N 19/14 - Complexité de l’unité de codage, p. ex. activité ou estimation de présence de contours
• H04N 19/107 - Sélection du mode de codage ou du mode de prédiction entre codage prédictif spatial et temporel, p. ex. rafraîchissement d’image
• H04N 19/11 - Sélection du mode de codage ou du mode de prédiction parmi plusieurs modes de codage prédictif spatial
• H04N 19/126 - Détails des fonctions de normalisation ou de pondération, p. ex. matrices de normalisation ou quantificateurs uniformes variables
• H04N 19/182 - Procédés ou dispositions pour le codage, le décodage, la compression ou la décompression de signaux vidéo numériques utilisant le codage adaptatif caractérisés par l’unité de codage, c.-à-d. la partie structurelle ou sémantique du signal vidéo étant l’objet ou le sujet du codage adaptatif l’unité étant un pixel
• H04N 19/61 - Procédés ou dispositions pour le codage, le décodage, la compression ou la décompression de signaux vidéo numériques utilisant un codage par transformée combiné avec un codage prédictif
• H04N 19/625 - Procédés ou dispositions pour le codage, le décodage, la compression ou la décompression de signaux vidéo numériques utilisant un codage par transformée utilisant une transformée en cosinus discrète

Abrégé

F) increases from a band edge of InGaAs (n-type InGaAs layer) to a band edge of InP (InP depletion layer).

Classes IPC  ?

• H01L 29/06 - Corps semi-conducteurs caractérisés par les formes, les dimensions relatives, ou les dispositions des régions semi-conductrices
• H01L 29/861 - Diodes
• H01Q 23/00 - Antennes comportant des circuits ou des éléments de circuit actifs qui leur sont intégrés ou liés
• H01L 29/36 - Corps semi-conducteurs caractérisés par la concentration ou la distribution des impuretés
• H01L 29/205 - Corps semi-conducteurs caractérisés par les matériaux dont ils sont constitués comprenant, à part les matériaux de dopage ou autres impuretés, uniquement des composés AIIIBV comprenant plusieurs composés dans différentes régions semi-conductrices
• H01L 29/66 - Types de dispositifs semi-conducteurs

Abrégé

The present invention provides a compact MCS with half the number of leader lines as compared with a conventional configuration. According to the present invention, M input ports; N output ports; M×N optical switch units (optical SUs); an optical waveguide which optically connects the M input ports, the M×N optical SUs, and the N output ports; and leader lines respectively connected to the M×N optical SUs are formed on a board. A multicast switch is configured such that, by putting one optical SU in an on state, a light signal is input to an input port associated with the optical SU in the on state and is output from an output port associated with the optical SU in the on state. The M×N optical SUs comprise at least a gate switch and a main switch, and the leader lines connected to the gate switches and the main switches in the respective optical SUs are common leader lines.

Classes IPC  ?

• G02F 1/313 - Dispositifs de déflexion numérique dans une structure de guide d'ondes optique

Abrégé

The present invention provides a compact MCS with half the number of leader lines as compared with a conventional configuration. According to the present invention, M input ports; N output ports; M×N optical switch units (optical SUs); an optical waveguide which optically connects the M input ports, the M×N optical SUs, and the N output ports; and leader lines respectively connected to the M×N optical SUs are formed on a board. A multicast switch is configured such that, by putting one optical SU in an on state, a light signal is input to an input port associated with the optical SU in the on state and is output from an output port associated with the optical SU in the on state. The M×N optical SUs comprise at least a gate switch and a main switch, and the leader lines connected to the gate switches and the main switches in the respective optical SUs are common leader lines.

Classes IPC  ?

• G02F 1/313 - Dispositifs de déflexion numérique dans une structure de guide d'ondes optique

Abrégé

An optical module comprising: a housing that has an opening portion; an optical component disposed inside the housing; and a fiber block that holds one end of an optical fiber outside the housing, the fiber block physically connecting the one end of the optical fiber to a light input/output end of the optical component via the opening portion of the housing, wherein the optical component is in close contact with the fiber block, and displacement between the housing and the fiber block is allowed by providing a gap between the opening portion and the fiber block, and a part of the fiber block on the optical fiber side is outside the housing.

Classes IPC  ?

• G02B 6/30 - Moyens de couplage optique pour usage entre fibre et dispositif à couche mince

Abrégé

This calculation circuit is provided with: a LUT generation circuit (1) that, when coefficients c[n] (n=1, ···, N) are divided into pairs, outputs a value calculated for each of the pairs; and a distribution calculation circuit (2-m) that calculates, for each pair of M pairs of data pieces x[m, n] in parallel, a product-sum calculation value y[m] obtained by multiplying, respectively with the coefficients c[n], data pieces x[m, n] in a data set X[m] (m=1, ···, M) including the M pairs and by summing the multiplied values. The distribution calculation circuit (2-m) is formed of: a plurality of binomial distribution calculation circuits that calculate binomial product-sum operation values in parallel for each pair, on the basis of a value obtained by dividing N data sets x[m, n] corresponding to the distributed operation circuit into pairs, a value obtained by dividing the coefficients c[n] into pairs, and the value calculated by the LUT generation circuit (1); and a binomial distribution calculation result summing circuit that sums the values calculated by the binomial distribution calculation circuits, and outputs the sum as y[m].

Classes IPC  ?

• G06F 17/10 - Opérations mathématiques complexes

Abrégé

[Problem] To provide an optical module having a structure with which the module can be reduced in size. [Solution] The optical module according to the present invention has a structure in which a portion of a fiber block 13 projects from a housing 11. As a result of comprising a thin plate 21, the optical module can prevent the intrusion of dust into the housing 11, while also allowing for positional displacement of the fiber block 13 due to errors in the mounting position of an optical component 12 in the housing 11, positional displacement of an opening 10 due to dimensional errors in the housing 11, or displacement caused by a temperature change, and the optical module can reduce a connection loss resulting from deviation in the optical axis.

Classes IPC  ?

• G02B 6/30 - Moyens de couplage optique pour usage entre fibre et dispositif à couche mince

Abrégé

This calculation circuit is provided with: a LUT generation circuit (1) that, when coefficients c[n] (n=1, ···, N) are divided into pairs, outputs a value calculated for each of the pairs; and a distribution calculation circuit (2-m) that calculates, for each pair of M pairs of data pieces x[m, n] in parallel, a product-sum calculation value z[m] obtained by multiplying, respectively with the coefficients c[n], data pieces x[m, n] in a data set X[m] (m=1, ···, M) including the M pairs and by summing the multiplied values. The distribution calculation circuit (2-m) is formed of: a plurality of binomial distribution calculation circuits that calculate binomial product-sum calculation values for each pair, on the basis of a value obtained by dividing N data sets x[m, n] corresponding to the distribution calculation circuit into pairs, a value obtained by dividing the coefficients c[n] into pairs, and the value calculated by the LUT generation circuit (1); a summing circuit that sums the calculated values; and a digit adjustment circuit that adjusts the number of digits after a decimal point in the summed result to a predetermined number of digits after a decimal point.

Classes IPC  ?

• G06F 17/10 - Opérations mathématiques complexes
• G06F 7/57 - Unités arithmétiques et logiques [UAL], c.-à-d. dispositions ou dispositifs pour accomplir plusieurs des opérations couvertes par les groupes ou pour accomplir des opérations logiques

Abrégé

This error correction device is provided with: a first correction unit that performs error correction decoding of data by means of a repetitive calculation, and has a full operation state in which the repetitive calculation for error correction decoding is repeated until converging, and a save operation state in which the repetitive calculation for error correction decoding is limited to a predetermined number of times; an error information estimation unit that estimates an input error rate or an output error rate of the first correction unit using the result of decoding by the first correction unit; and a control unit that, on the basis of information of a least any of the input error rate, the output error rate, and the operating time of the first correction unit, controls a transition between the full operation state and the save operation state of the first correction unit. According to the invention of the present application, an error correction device capable of improving a transmission characteristic while suppressing power consumption can be provided.

Classes IPC  ?

• H04L 1/00 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue
• H03M 13/47 - Détection d'erreurs, correction d'erreurs transmises ou protection contre les erreurs, non prévues dans les groupes

Abrégé

The present invention provides a wideband optical wavelength multiplexer/demultiplexer capable of supplying the transmission band required for a high-speed modulation scheme without needing to increase a channel interval. Two parabolic waveguides are arranged so that the central position between the two parabolic waveguides matches the central position along the connection end surface of a first slab waveguide when the connection position with the first slab waveguide in one of the two parabolic waveguides is moved toward the other parabolic waveguide by a channel frequency interval Δf while two waveguide groups in an output waveguide are arranged so that the central position between the two waveguide groups matches the central position of a second slab waveguide. The interval between the connection position of the other parabolic waveguide with the first slab waveguide and the central position along the connection end surface of the first slab waveguide is set equal to the interval between the connection position of the waveguide groups with the second slab waveguide and the central position along the connection end surface of the second slab waveguide. The interval between the waveguides adjacent to each other for each of the two waveguide groups is set to two times greater than the interval between channel frequencies.

Classes IPC  ?

• G02B 6/12 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage du type guide d'ondes optiques du genre à circuit intégré

Abrégé

Fourier transform is performed on a reception signal to obtain a first calculation value. Fourier transform is performed on a known signal to obtain a second calculation value. The first calculation value is divided by the second calculation value to obtain a third calculation value. Inverse Fourier transform is performed on the third calculation value to obtain a fourth calculation value. A maximum value of an amplitude of the fourth calculation value and a sample point at which the maximum value is obtained are detected. The position of the known signal in the reception signal is detected from the sample point at which the maximum value is obtained.

Classes IPC  ?

• H04B 10/61 - Récepteurs cohérents
• H04L 7/04 - Commande de vitesse ou de phase au moyen de signaux de synchronisation
• H04L 7/08 - Commande de vitesse ou de phase au moyen de signaux de synchronisation les signaux de synchronisation revenant cycliquement
• H04L 7/00 - Dispositions pour synchroniser le récepteur avec l'émetteur

Abrégé

The present invention estimates a transfer function or an inverse transfer function of a transmission unit (9a) of a first optical transmitter/receiver (9) from first data acquired by a second optical transmitter/receiver (16) when a first known signal is transmitted from the first optical transmitter/receiver (9) to the second optical transmitter/receiver (16) and from a preliminary transfer function or inverse transfer function of a reception unit (16b) of the second optical transmitter/receiver (16). The estimated transfer function or inverse transfer function of the transmission unit (9a) of the first optical transmitter/receiver (9) is transmitted from the second optical transmitter/receiver (16) to the first optical transmitter/receiver (9). A transfer function or an inverse transfer function of the reception unit (16b) of the second optical transmitter/receiver (16) is estimated from second data acquired by the second optical transmitter/receiver (16) when a second known signal is transmitted from the first optical transmitter/receiver (9) to the second optical transmitter/receiver (16), the second known signal having been compensated according to the transmitted transfer function or inverse transfer function of the transmission unit (9a) of the first optical transmitter/receiver (9).

Classes IPC  ?

• H04B 10/079 - Dispositions pour la surveillance ou le test de systèmes de transmissionDispositions pour la mesure des défauts de systèmes de transmission utilisant un signal en service utilisant des mesures du signal de données
• H04L 27/34 - Systèmes à courant porteur à modulation de phase et d'amplitude, p. ex. en quadrature d'amplitude

Abrégé

A reception circuit includes a first adaptive compensator compensating distortion of a received signal. An adaptive compensation coefficient calculator includes a known-signal detector detecting first and second known-signals from the received signal, a second adaptive compensator compensating distortion of the received signal, a tap coefficient initial value calculator calculating an initial value of a tap coefficient of the second adaptive compensator by comparing the first known-signal with its true value, a first phase shift compensator compensating phase shift of an output of the second adaptive compensator using the second known-signal, and a tap coefficient calculator calculating tap coefficients of the first and second adaptive compensators by comparing at least one of the first and second known-signals compensated by the second adaptive compensator and the first phase shift compensator with its true value.

Classes IPC  ?

• H04B 10/60 - Récepteurs
• H04B 10/2507 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion
• H04B 3/10 - Réglage de la transmissionÉgalisation par signal pilote
• H04L 27/01 - Égaliseurs
• H04B 10/61 - Récepteurs cohérents

Abrégé

A symbol phase difference compensating portion (6) calculates a first phase difference which is a phase difference between a known pattern extracted from a received signal and a true value of the known pattern and performs phase compensation for the received signal based on the first phase difference. A tentative determination portion (12) tentatively determines an output signal of the symbol phase difference compensating portion (6) to acquire an estimated value of a phase. A first phase difference acquiring portion (13) acquires a second phase difference which is a phase difference between a phase of the output signal and the estimated value of the phase acquired by the tentative determination portion (12). A first phase difference compensating portion (14) performs phase compensation for the output signal based on the second phase difference.

Classes IPC  ?

• H04B 10/61 - Récepteurs cohérents
• H04L 27/01 - Égaliseurs
• H04L 27/38 - Circuits de démodulationCircuits récepteurs

Abrégé

The present invention achieves an amplifier, represented by a TIA, in which band characteristics are optimized, the probability of oscillation is reduced, and that exhibits little variation in band characteristics. This amplifier, which amplifies an electric signal, includes: a first buffer that amplifies the electric signal; a filter that is connected to the output of the first buffer and that includes a parallel circuit comprising an inductor and a first capacitor; and a second buffer that is connected to the output of the filter.

Classes IPC  ?

• H03F 3/08 - Amplificateurs comportant comme éléments d'amplification uniquement des tubes à décharge ou uniquement des dispositifs à semi-conducteurs comportant uniquement des dispositifs à semi-conducteurs commandés par la lumière
• H03F 1/26 - Modifications des amplificateurs pour réduire l'influence du bruit provoqué par les éléments amplificateurs

Abrégé

A video coding device 1 utilizes intra-slicing in which an intra-slice area that is intra-coded is moved on a picture-by-picture basis. An intra-slice control unit 20 inserts, between intra-slice pictures that include an intra-slice region, a non-intra-slice picture that does not include an intra-slice region.

Classes IPC  ?

• H04N 19/107 - Sélection du mode de codage ou du mode de prédiction entre codage prédictif spatial et temporel, p. ex. rafraîchissement d’image
• H04N 19/172 - Procédés ou dispositions pour le codage, le décodage, la compression ou la décompression de signaux vidéo numériques utilisant le codage adaptatif caractérisés par l’unité de codage, c.-à-d. la partie structurelle ou sémantique du signal vidéo étant l’objet ou le sujet du codage adaptatif l’unité étant une zone de l'image, p. ex. un objet la zone étant une image, une trame ou un champ
• H04N 19/174 - Procédés ou dispositions pour le codage, le décodage, la compression ou la décompression de signaux vidéo numériques utilisant le codage adaptatif caractérisés par l’unité de codage, c.-à-d. la partie structurelle ou sémantique du signal vidéo étant l’objet ou le sujet du codage adaptatif l’unité étant une zone de l'image, p. ex. un objet la zone étant une tranche, p. ex. une ligne de blocs ou un groupe de blocs
• H04N 19/65 - Procédés ou dispositions pour le codage, le décodage, la compression ou la décompression de signaux vidéo numériques utilisant la tolérance aux erreurs

Abrégé

A transfer function or inverse transfer function of an optical transmitter (7) of a transmission unit (1) is estimated from first data acquired by a reception unit (3) when a first known signal was transmitted from the transmission unit (1) to the reception unit (3) of an optical transceiver, and a tentative transfer function or inverse transfer function of an optical receiver (9) of the reception unit (3). A transfer function or inverse transfer function of the optical receiver (9) is estimated from second data acquired by the reception unit (3) when a second known signal was transmitted from the transmission unit (1) to the reception unit (3), and the estimated transfer function or inverse transfer function of the optical transmitter (7).

Classes IPC  ?

• H04B 10/079 - Dispositions pour la surveillance ou le test de systèmes de transmissionDispositions pour la mesure des défauts de systèmes de transmission utilisant un signal en service utilisant des mesures du signal de données
• H04B 10/61 - Récepteurs cohérents

Abrégé

A transfer function or inverse transfer function of an optical transmitter (7) of a transmission unit (1) is estimated from first data acquired by a reception unit (3) when a first known signal was transmitted from the transmission unit (1) to the reception unit (3) of an optical transceiver, and a tentative transfer function or inverse transfer function of an optical receiver (9) of the reception unit (3). A transfer function or inverse transfer function of the optical receiver (9) is estimated from second data acquired by the reception unit (3) when a second known signal was transmitted from the transmission unit (1) to the reception unit (3), and the estimated transfer function or inverse transfer function of the optical transmitter (7).

Classes IPC  ?

• H04B 10/079 - Dispositions pour la surveillance ou le test de systèmes de transmissionDispositions pour la mesure des défauts de systèmes de transmission utilisant un signal en service utilisant des mesures du signal de données
• H04B 10/61 - Récepteurs cohérents

Abrégé

The present invention achieves faster and more efficient CABAC decoding processing. A binary arithmetic decoding device 1 is provided with: an LPS/MPS determination unit 13 for using a context variable, range length, and offset to determine whether symbols are a least probable symbol or a most probable symbol; a renormalization processing unit for performing renormalization processing on the range length and offset; and a context variable calculation unit for using a determination result to derive the binary data of the symbols, and updating the context variables in accordance with the determination result. The renormalization processing unit 15 is provided with a first renormalization unit 151 for performing renormalization processing by regarding the symbols as being least probable symbols in parallel with the determination processing of the LPS/MPS determination unit 13, a second renormalization unit 152 for performing renormalization processing by regarding the symbols as being most probable symbols in parallel with the determination processing of the LPS/MPS determination unit 13, and a selection unit 153 for selecting either the output of the first renormalization unit 151 or the output of the second renormalization unit 152, depending on the determination result.

Classes IPC  ?

• H03M 7/42 - Conversion en, ou à partir de codes de longueur variable, p. ex. code Shannon-Fano, code Huffman, code Morse utilisant une table pour le procédé de codage ou de décodage, p. ex. utilisant une mémoire morte
• H04N 19/91 - Codage entropique, p. ex. codage à longueur variable ou codage arithmétique

Abrégé

In the present invention, a plurality of error correction circuits correct errors of data transmitted via a plurality of transmission paths. A joining unit (12) has the function of joining a plurality of transmission paths to a plurality of error correction circuits in a redundant manner. The plurality of transmission paths include a first transmission path (I) and a second transmission path (II) having lower transmission properties than the first transmission path. The plurality of error correction circuits include a first error correction circuit (8a) and a second error correction circuit (8b) having lower correction capability and lower electric power consumption than the first error correction circuit (8a). The joining unit (12) uses the function of joining a plurality of error correction circuits to one transmission path in a redundant manner, thereby joining the first transmission path (I) to the second error correction circuit (8b) at a higher rate than the first error correction circuit (8a) and joining the second transmission path (II) to the first error correction circuit (8a) at a higher rate than the second error correction circuit (8b).

Classes IPC  ?

• H03M 13/35 - Protection inégale ou adaptative contre les erreurs, p. ex. en fournissant un niveau différent de protection selon le poids de l'information d'origine ou en adaptant le codage selon le changement des caractéristiques de la voie de transmission
• H03M 13/29 - Codage, décodage ou conversion de code pour détecter ou corriger des erreursHypothèses de base sur la théorie du codageLimites de codageMéthodes d'évaluation de la probabilité d'erreurModèles de canauxSimulation ou test des codes combinant plusieurs codes ou structures de codes, p. ex. codes de produits, codes de produits généralisés, codes concaténés, codes interne et externe
• H04J 99/00 - Matière non prévue dans les autres groupes de la présente sous-classe
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples

Abrégé

In the present invention, a plurality of error correction circuits correct errors of data transmitted via a plurality of transmission paths. A joining unit (12) has the function of joining a plurality of transmission paths to a plurality of error correction circuits in a redundant manner. The plurality of transmission paths include a first transmission path (I) and a second transmission path (II) having lower transmission properties than the first transmission path. The plurality of error correction circuits include a first error correction circuit (8a) and a second error correction circuit (8b) having lower correction capability and lower electric power consumption than the first error correction circuit (8a). The joining unit (12) uses the function of joining a plurality of error correction circuits to one transmission path in a redundant manner, thereby joining the first transmission path (I) to the second error correction circuit (8b) at a higher rate than the first error correction circuit (8a) and joining the second transmission path (II) to the first error correction circuit (8a) at a higher rate than the second error correction circuit (8b).

Classes IPC  ?

• H03M 13/29 - Codage, décodage ou conversion de code pour détecter ou corriger des erreursHypothèses de base sur la théorie du codageLimites de codageMéthodes d'évaluation de la probabilité d'erreurModèles de canauxSimulation ou test des codes combinant plusieurs codes ou structures de codes, p. ex. codes de produits, codes de produits généralisés, codes concaténés, codes interne et externe
• H03M 13/35 - Protection inégale ou adaptative contre les erreurs, p. ex. en fournissant un niveau différent de protection selon le poids de l'information d'origine ou en adaptant le codage selon le changement des caractéristiques de la voie de transmission
• H04J 99/00 - Matière non prévue dans les autres groupes de la présente sous-classe
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples

Abrégé

A parallel transfer rate converter inputs first parallel data with number of samples being S1 pieces in synchronism with a first clock, and outputs second parallel data with number of samples being S2=S1×(m/p) pieces (p is an integer equal to or larger than 1) in synchronism with a second clock having a frequency which is p/m times of a frequency of the first clock. A convolution operation device inputs the second parallel data in synchronism with the second clock, generates third parallel data with number of samples being S3=S2×(n/m) pieces (S3 is an integer equal to or larger than 1) by executing a convolution operation with a coefficient indicating a transmission characteristic to the second parallel data, and outputs the third parallel data in synchronism with the second clock.

Classes IPC  ?

• H04L 7/00 - Dispositions pour synchroniser le récepteur avec l'émetteur
• H03H 17/02 - Réseaux sélecteurs de fréquence

Abrégé

In the present invention a bandwidth division timing adjustment unit (10) aligns the timing of multiple signals in a time domain, said multiple signals being obtained by dividing a received signal for each of multiple frequency bands, and then combines the multiple signals the timing of which has been aligned. A wavelength dispersion compensation unit (17) compensates wavelength dispersion of an output signal from the bandwidth division timing adjustment unit (10) for each of the multiple frequency bands.

Classes IPC  ?

• H04B 10/2513 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion due à la dispersion chromatique
• H04B 10/61 - Récepteurs cohérents

Abrégé

In the present invention a bandwidth division timing adjustment unit (10) aligns the timing of multiple signals in a time domain, said multiple signals being obtained by dividing a received signal for each of multiple frequency bands, and then combines the multiple signals the timing of which has been aligned. A wavelength dispersion compensation unit (17) compensates wavelength dispersion of an output signal from the bandwidth division timing adjustment unit (10) for each of the multiple frequency bands.

Classes IPC  ?

• H04B 10/2513 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion due à la dispersion chromatique
• H04B 10/61 - Récepteurs cohérents

Abrégé

Signal processing sections selectively switch modulation/demodulation in low-efficiency modulation system and modulation/demodulation in high-efficiency modulation system, and perform digital signal processing. Parallel-side interfaces of input/output interface sections are electrically connected to the signal processing section. A serial-side interface of the input/output interface section is electrically connected to a serial-side interface of the input/output interface section. A selection section electrically connects a parallel-side interface of the input/output interface section to the signal processing section when the low-efficiency modulation system is selected, and electrically connects the parallel-side interface of the input/output interface section to a parallel-side interface of the input/output interface section when the high-efficiency modulation system is selected.

Classes IPC  ?

• H04B 10/516 - Détails du codage ou de la modulation
• H04B 10/50 - Émetteurs
• H04B 10/60 - Récepteurs
• H04B 10/40 - Émetteurs-récepteurs

Abrégé

In the case of implementing a polarization separation circuit, a polarization rotator, and the like by inserting a thin-film element into a substrate in one optical interference circuit, one common large-sized groove shared among a plurality of thin-film elements for their insertion has been formed. The optical waveguide type device of the present invention is configured such that at least one groove intersects only one corresponding optical waveguide for inserting the thin-film element and does not intersect other optical waveguides adjacent to the one corresponding optical waveguide. This groove substantially has a rectangular shape, and has a minimum size adapted to the thin-film element to be inserted so as to stably hold and fix the thin-film element in the groove. Adjacent grooves are formed so as to be arranged such that their portions in a direction substantially vertical to the optical waveguide are facing each other.

Classes IPC  ?

• F21V 8/00 - Utilisation de guides de lumière, p. ex. dispositifs à fibres optiques, dans les dispositifs ou systèmes d'éclairage
• G02B 5/136 - Réflecteurs reflex plusieurs éléments réfléchissants formant partie d'un même corps
• G02B 6/293 - Moyens de couplage optique ayant des bus de données, c.-à-d. plusieurs guides d'ondes interconnectés et assurant un système bidirectionnel par nature en mélangeant et divisant les signaux avec des moyens de sélection de la longueur d'onde
• G02B 6/136 - Circuits optiques intégrés caractérisés par le procédé de fabrication par gravure
• G02B 6/12 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage du type guide d'ondes optiques du genre à circuit intégré
• G02B 6/13 - Circuits optiques intégrés caractérisés par le procédé de fabrication
• G02B 6/125 - Courbures, branchements ou intersections
• G02B 6/126 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage du type guide d'ondes optiques du genre à circuit intégré utilisant des effets de polarisation

Abrégé

The purpose of the present invention is to provide a low-cost optical circuit board with which it is possible to align with a fiber array while mounted on a package and reduce size without affecting the main circuit section, and to also provide an optical device and an alignment method. This optical circuit board has a loop-back circuit mounted thereon, which returns aligning light in the vicinity of a fiber array connection end to the fiber array. Since an aligning loop-back circuit can be thus formed in an optical waveguide pattern, production costs do not increase in comparison to conventional optical circuit boards. Aligning light that links from an optical fiber to an aligning port of the optical circuit board is returned to the optical fiber via the loop-back circuit. Therefore, alignment is possible using said returned light. In other words, alignment is possible while mounted on a package without having to install a light-reflecting film or mirror.

Classes IPC  ?

• G02B 6/122 - Éléments optiques de base, p. ex. voies de guidage de la lumière
• G02B 6/30 - Moyens de couplage optique pour usage entre fibre et dispositif à couche mince

Abrégé

The purpose of the present invention is to provide a low-cost optical circuit board with which it is possible to align with a fiber array while mounted on a package and reduce size without affecting the main circuit section, and to also provide an optical device and an alignment method. This optical circuit board has a loop-back circuit mounted thereon, which returns aligning light in the vicinity of a fiber array connection end to the fiber array. Since an aligning loop-back circuit can be thus formed in an optical waveguide pattern, production costs do not increase in comparison to conventional optical circuit boards. Aligning light that links from an optical fiber to an aligning port of the optical circuit board is returned to the optical fiber via the loop-back circuit. Therefore, alignment is possible using said returned light. In other words, alignment is possible while mounted on a package without having to install a light-reflecting film or mirror.

Classes IPC  ?

• G02B 6/122 - Éléments optiques de base, p. ex. voies de guidage de la lumière
• G02B 6/30 - Moyens de couplage optique pour usage entre fibre et dispositif à couche mince

Abrégé

A flexible substrate having a branch structure in the related art has problems in that: adhesive strength after two bodies are folded and fixed at a bonding region decreases due to an unfolding and opening force at a curve portion and ends of the bonded portions are peeled off and generate gaps; and in a soldering process of the two bodies, the electrodes of one body soldered first are displaced due to reheating in soldering the other body secondly and deteriorate in soldered connection. The present invention provides a new flexible substrate having a branch structure, including first and second bodies joined together, and having a structure in which one of the bodies can be folded back in a longitudinal direction of the whole flexible substrate. Tip ends of the two bodies are provided with multiple electrodes, and are connected by soldering to approximately corresponding positions on both surfaces of an end portion of a printed substrate concerned.

Classes IPC  ?

• H05K 3/36 - Assemblage de circuits imprimés avec d'autres circuits imprimés
• H05K 3/40 - Fabrication d'éléments imprimés destinés à réaliser des connexions électriques avec ou entre des circuits imprimés
• H05K 1/14 - Association structurale de plusieurs circuits imprimés
• H05K 1/02 - Circuits imprimés Détails
• H05K 1/11 - Éléments imprimés pour réaliser des connexions électriques avec ou entre des circuits imprimés

Abrégé

A processing equipment includes a processing unit having a plurality of functions. A retaining unit retains a device identifier capable of identifying the processing equipment. An interface unit receives a function authentication key which is a code for setting a specific function among the plurality of functions to be enabled or disabled. A control unit sets the specific function to be enabled or disabled according to the function authentication key when a device identifier included in the received function authentication key coincides with the device identifier retained in the retaining unit.

Classes IPC  ?

• H04L 29/06 - Commande de la communication; Traitement de la communication caractérisés par un protocole
• G06F 21/12 - Protection des logiciels exécutables
• H04B 10/27 - Dispositions pour la mise en réseau
• H04L 12/28 - Réseaux de données à commutation caractérisés par la configuration des liaisons, p. ex. réseaux locaux [LAN Local Area Networks] ou réseaux étendus [WAN Wide Area Networks]
• G06F 21/10 - Protection de programmes ou contenus distribués, p. ex. vente ou concession de licence de matériel soumis à droit de reproduction
• H04L 12/24 - Dispositions pour la maintenance ou la gestion
• H04B 10/40 - Émetteurs-récepteurs
• G06F 21/71 - Protection de composants spécifiques internes ou périphériques, où la protection d'un composant mène à la protection de tout le calculateur pour assurer la sécurité du calcul ou du traitement de l’information

Abrégé

According to the present invention, Fourier transform is performed on a reception signal to obtain a first calculation value. Fourier transform is performed on a known signal to obtain a second calculation value. The first calculation value is divided by the second calculation value to obtain a third calculation value. Inverse Fourier transform is performed on the third calculation value to obtain a fourth calculation value. The maximum value of the amplitude of the fourth calculation value and a sample point at which the maximum value is obtained, are detected. The position of the known signal in the reception signal is detected from the sample point at which the maximum value is obtained.

Classes IPC  ?

• H04B 10/61 - Récepteurs cohérents
• H04L 7/04 - Commande de vitesse ou de phase au moyen de signaux de synchronisation
• H04L 7/08 - Commande de vitesse ou de phase au moyen de signaux de synchronisation les signaux de synchronisation revenant cycliquement

Abrégé

According to the present invention, Fourier transform is performed on a reception signal to obtain a first calculation value. Fourier transform is performed on a known signal to obtain a second calculation value. The first calculation value is divided by the second calculation value to obtain a third calculation value. Inverse Fourier transform is performed on the third calculation value to obtain a fourth calculation value. The maximum value of the amplitude of the fourth calculation value and a sample point at which the maximum value is obtained, are detected. The position of the known signal in the reception signal is detected from the sample point at which the maximum value is obtained.

Classes IPC  ?

• H04B 10/61 - Récepteurs cohérents
• H04L 7/04 - Commande de vitesse ou de phase au moyen de signaux de synchronisation
• H04L 7/08 - Commande de vitesse ou de phase au moyen de signaux de synchronisation les signaux de synchronisation revenant cycliquement

Abrégé

An I-component compensation unit (15) constitutes a first polynomial representing an I-component distortion on the basis of an I-component and a Q-component of an orthogonal modulation signal, and calculates a distortion-compensated I-component by multiplying each term in the first polynomial by a first coefficient. A Q-component compensation unit (16) constitutes a second polynomial representing a Q-component distortion on the basis of the I-component and the Q-component of the orthogonal modulation signal, and calculates a distortion-compensated Q-component by multiplying each term in the second polynomial by a second coefficient. A coefficient calculation unit (17) calculates the first and second coefficients by comparing outputs of the I-component compensation unit (15) and the Q-component compensation unit (16) with a known signal.

Classes IPC  ?

• H04L 27/01 - Égaliseurs
• H04B 10/2507 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion
• H04B 10/60 - Récepteurs
• H04L 27/06 - Circuits de démodulationCircuits récepteurs

Abrégé

A symbol phase difference compensation unit (6) calculates a first phase difference that is a phase difference between a known pattern extracted from a received signal and a true value thereof, and makes phase compensation for the received signal on the basis of the first phase difference. A provisional determination unit (12) provisionally determines an output signal of the symbol phase difference compensation unit (6) to find an estimated value of a phase. A phase difference acquisition unit (13) acquires a second phase difference that is a phase difference between the phase of the output signal and the estimated value of the phase found by the provisional determination unit (12). A phase difference compensation unit (14) makes phase compensation for the output signal on the basis of the second phase difference.

Classes IPC  ?

• H04B 10/61 - Récepteurs cohérents
• H04L 27/01 - Égaliseurs
• H04L 27/38 - Circuits de démodulationCircuits récepteurs

Abrégé

A reception circuit (5) includes a first adaptive compensator (7) compensating distortion of a received signal. An adaptive compensation coefficient calculator (6) includes a known-signal detector (8) detecting first and second known-signals from the received signal, a second adaptive compensator (10) compensating distortion of the received signal, a tap coefficient initial value calculator (12) calculating an initial value of a tap coefficient of the second adaptive compensator (10) by comparing the first known-signal with its true value, a first phase shift compensator (14) compensating phase shift of an output of the second adaptive compensator (10) using the second known-signal, and a tap coefficient calculator (16) calculating tap coefficients of the first and second adaptive compensators (7,10) by comparing at least one of the first and second known-signals compensated by the second adaptive compensator (10) and the first phase shift compensator (14) with its true value.

Classes IPC  ?

• H04B 3/10 - Réglage de la transmissionÉgalisation par signal pilote
• H04B 10/2507 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion
• H04B 10/61 - Récepteurs cohérents
• H04L 27/01 - Égaliseurs

Abrégé

In the present invention a reception circuit (5) has a first adaptive compensation unit (7) that compensates for distortion in a received signal. An adaptive compensation coefficient calculation unit (6) has: a known signal detection unit (8) that detects first and second known signals from the received signal; a second adaptive compensation unit (10) that compensates for distortion in the received signal; a tap coefficient initial value calculation unit (12) that calculates an initial value for a tap coefficient of the second adaptive compensation unit (10) on the basis of a comparison of the first known signal and a true value thereof; a first phase fluctuation compensation unit (14) that uses the second known signal to compensate for phase fluctuation in the output from the second adaptive compensation unit; and a tap coefficient calculation unit (16) that calculates a tap coefficient for the first and second adaptive compensation units (7, 10) on the basis of a comparison of at least one of the first and second known signals that have been compensated by the second adaptive compensation unit (10) and the first phase fluctuation compensation unit (14), and true values thereof.

Classes IPC  ?

• H04B 10/2507 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion
• H04B 3/10 - Réglage de la transmissionÉgalisation par signal pilote
• H04B 10/61 - Récepteurs cohérents
• H04L 27/01 - Égaliseurs

Abrégé

A symbol phase difference compensation unit (6) calculates a first phase difference that is a phase difference between a known pattern extracted from a received signal and a true value thereof, and makes phase compensation for the received signal on the basis of the first phase difference. A provisional determination unit (12) provisionally determines an output signal of the symbol phase difference compensation unit (6) to find an estimated value of a phase. A phase difference acquisition unit (13) acquires a second phase difference that is a phase difference between the phase of the output signal and the estimated value of the phase found by the provisional determination unit (12). A phase difference compensation unit (14) makes phase compensation for the output signal on the basis of the second phase difference.

Classes IPC  ?

• H04L 27/01 - Égaliseurs
• H04B 10/61 - Récepteurs cohérents
• H04L 27/38 - Circuits de démodulationCircuits récepteurs

Abrégé

A method whereby a compensation coefficient calculation unit (6) calculates a compensation coefficient of a compensation unit (5) that compensates for the transmission characteristics of a signal, wherein a known signal is extracted from the signal first. Next, a pseudorandom number is added to the extracted known signal. Subsequently, a compensation coefficient is calculated from the comparison of the known signal to which the pseudorandom number was added and the true value of the known signal.

Classes IPC  ?

• H04B 3/10 - Réglage de la transmissionÉgalisation par signal pilote
• H04B 10/2507 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion
• H04B 10/61 - Récepteurs cohérents
• H04L 27/01 - Égaliseurs
• H04L 27/26 - Systèmes utilisant des codes à fréquences multiples

Abrégé

The present invention provides an optical module which is connectable to an optical fiber array and which can be packaged in a high density. Two 30 mm square package modules(102, 105) are mounted on a board(101), and optical waveguides in a 20 mm square Si photonic lightwave circuit(103) mounted on the package module(102) are connected to an optical fiber array(106) fixed to an optical fiber block (15 x10 mm)(104). Output end surfaces of the optical waveguides are perpendicular to a mount surface of the package module(102). The optical waveguides in the Si photonic lightwave circuit(103) may be tilted at, for example, 20 degrees with respect to a direction perpendicular to a right end surface. The optical fiber block(104) fixes optical fibers with the optical fibers tilted at 20 degrees with respect to a direction perpendicular to an end surface connected to the Si photonic lightwave circuit(103).

Classes IPC  ?

• G02B 6/122 - Éléments optiques de base, p. ex. voies de guidage de la lumière
• G02B 6/30 - Moyens de couplage optique pour usage entre fibre et dispositif à couche mince

Abrégé

Provided is an optical module which has a connection to an optical fiber array and which can be densely mounted. To a board (101), two 30-mm-square package modules (102, 105) are mounted, and an optical waveguide of a 20-mm-square Si photonics lightwave circuit (103) mounted on the package module (102) and an optical fiber array (106) fixed to an optical fiber block (15 × 10 mm) (104) are connected. In addition, an emission end surface of the optical waveguide of the Si photonics lightwave circuit (103) is perpendicular to a mounting surface of the package module (102). In the present embodiment, the optical waveguide of the Si photonics lightwave circuit (103) is inclined at an appropriate angle, for example, 20 degrees, to a direction perpendicular to a right-side end surface. The optical fiber block (104) is fixed such that each of the optical fibers is also inclined at 20 degrees to a direction perpendicular to an end surface through which the optical fibers are connected to the Si photonics lightwave circuit (103).

Classes IPC  ?

• G02B 6/122 - Éléments optiques de base, p. ex. voies de guidage de la lumière
• G02B 6/30 - Moyens de couplage optique pour usage entre fibre et dispositif à couche mince

Abrégé

F) increases from a band edge of InGaAs (n-type InGaAs layer) to a band edge of InP (InP depletion layer).

Classes IPC  ?

• H01L 29/205 - Corps semi-conducteurs caractérisés par les matériaux dont ils sont constitués comprenant, à part les matériaux de dopage ou autres impuretés, uniquement des composés AIIIBV comprenant plusieurs composés dans différentes régions semi-conductrices
• H01L 29/861 - Diodes
• H01Q 23/00 - Antennes comportant des circuits ou des éléments de circuit actifs qui leur sont intégrés ou liés
• H01L 29/66 - Types de dispositifs semi-conducteurs
• H01L 29/36 - Corps semi-conducteurs caractérisés par la concentration ou la distribution des impuretés
• H01L 29/06 - Corps semi-conducteurs caractérisés par les formes, les dimensions relatives, ou les dispositions des régions semi-conductrices

Abrégé

A parallel transfer rate converter (4) synchronizes first parallel data, the sample number of which is S1 samples, with a first clock, inputs the same, synchronizes second parallel data, the sample number of which is S2, which equals S1×(m/p) samples (p is an integer no less than 1), with a second clock having a frequency that is p/m times that of the first clock, and outputs the same. A convolution calculator (5) synchronizes the second parallel data with the second clock, inputs the same, generates third parallel data, the sample number of which is S3, which equals S2×(n/m) samples (S3 is an integer no less than 1), by subjecting the second parallel data to a convolution operation with a coefficient expressing transfer characteristics, synchronizes the third parallel data with the second clock, and outputs the same.

Classes IPC  ?

• H03H 17/00 - Réseaux utilisant des techniques numériques
• H03H 17/06 - Filtres non récursifs

Abrégé

A FIR filter (7) convolves sampling data, which is obtained by sampling a received signal, with a tap coefficient. A phase difference detection unit (8) detects the phase difference between the synchronization timing of a signal waveform estimated from an output signal from the FIR filter (7), and the output signal sampling timing. A tap-coefficient adjustment unit (9) causes the sampling timing of the output signal from the FIR filter (7) to track the synchronization timing, by adjusting the tap coefficient so as to decrease the phase difference detected by the phase difference detection unit (8).

Classes IPC  ?

• H04L 7/00 - Dispositions pour synchroniser le récepteur avec l'émetteur
• H03H 17/02 - Réseaux sélecteurs de fréquence
• H03H 17/06 - Filtres non récursifs

Abrégé

A parallel transfer rate converter (4) inputs first parallel data with number of samples being S1 pieces in synchronism with a first clock, and outputs second parallel data with number of samples being S2=S1x(m/p) pieces (p is an integer equal to or larger than 1) in synchronism with a second clock having a frequency which is p/m times of a frequency of the first clock. A convolution operation device (5) inputs the second parallel data in synchronism with the second clock, generates third parallel data with number of samples being S3=S2x(n/m) pieces (S3 is an integer equal to or larger than 1) by executing a convolution operation with a coefficient indicating a transmission characteristic to the second parallel data, and outputs the third parallel data in synchronism with the second clock.

Classes IPC  ?

• G06F 3/05 - Entrée numérique utilisant l'échantillonnage d'une quantité analogique à intervalles réguliers de temps
• G06F 5/00 - Procédés ou dispositions pour la conversion de données, sans modification de l'ordre ou du contenu des données maniées
• G06F 7/00 - Procédés ou dispositions pour le traitement de données en agissant sur l'ordre ou le contenu des données maniées

Abrégé

To ensure good detection characteristics by suppressing degradation of I-V characteristics of a heterojunction barrier diode (HBD) which operates with zero bias in the THz frequency band. The detection diode is provided with a semiconductor laminated structure, wherein a high concentration n-type first semiconductor layer, a second semiconductor layer having a smaller electron affinity in comparison to that of the first semiconductor layer, and an n-type third semiconductor layer 1 are laminated in order; a heterobarrier is formed at the second semiconductor layer side of an interface between the first semiconductor layer and the second semiconductor layer; the barrier height of the heterobarrier is adjusted by adjusting the doping level of the first semiconductor layer; an anode electrode is formed on the first semiconductor layer; a cathode electrode is formed on the third semiconductor layer; the second semiconductor layer including an undoped barrier layer which contacts the first semiconductor layer, and an n-type barrier layer which contacts the third semiconductor layer.

Classes IPC  ?

• H01L 29/861 - Diodes
• H01L 29/205 - Corps semi-conducteurs caractérisés par les matériaux dont ils sont constitués comprenant, à part les matériaux de dopage ou autres impuretés, uniquement des composés AIIIBV comprenant plusieurs composés dans différentes régions semi-conductrices
• H01L 29/868 - Diodes PIN

Abrégé

A technique that does not increase the circuit size, does not make the circuit design and manufacturing difficult, and can reduce insertion loss when light enters from a slab waveguide toward an arrayed waveguide or when the light enters from the arrayed waveguide toward the slab waveguide. An optical waveguide provided with a slab waveguide in which a grating is formed therein at a distance from an end, and an arrayed waveguide whose end is connected to an end of the slab waveguide at a position where a constructive interference portion of a self-image of the grating is formed. An arrayed waveguide grating provided with a first input/output waveguide, the above-mentioned optical waveguide where an end of the slab waveguide on the opposite side of the arrayed waveguide is connected to an end of the first input/output waveguide, a second slab waveguide connected to an end of the arrayed waveguide on the opposite side of the slab waveguide, and a second input/output waveguide connected to an end of the second slab waveguide on the opposite side of the arrayed waveguide.

Classes IPC  ?

• G02B 6/34 - Moyens de couplage optique utilisant des prismes ou des réseaux
• G02B 6/12 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage du type guide d'ondes optiques du genre à circuit intégré
• G02B 6/293 - Moyens de couplage optique ayant des bus de données, c.-à-d. plusieurs guides d'ondes interconnectés et assurant un système bidirectionnel par nature en mélangeant et divisant les signaux avec des moyens de sélection de la longueur d'onde

Abrégé

In a waveguide device, unnecessary optical power is appropriately terminated. According to an embodiment of the present invention, the waveguide device has a termination structure filled with a light blocking material to terminate light from a waveguide end. In the termination structure, a cladding and a core are removed to form a groove on an optical waveguide. The groove is filled with a material (light blocking material) that attenuates the intensity of light. Thus, light input to the termination structure is attenuated by the light blocking material, suppressing crosstalk which possibly effects on other optical devices. Thus, such a termination structure can restrain crosstalk occurred in optical devices integrated in the same substrate and can also suppress crosstalk which possibly effects on any other optical device connected directly to the substrate.

Classes IPC  ?

• G02B 6/12 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage du type guide d'ondes optiques du genre à circuit intégré
• G02B 6/24 - Couplage de guides de lumière
• G02B 6/255 - Épissage des guides de lumière, p. ex. par fusion ou par liaison
• G02B 6/122 - Éléments optiques de base, p. ex. voies de guidage de la lumière
• G02B 6/124 - Lentilles géodésiques ou réseaux intégrés
• G02B 6/30 - Moyens de couplage optique pour usage entre fibre et dispositif à couche mince

Abrégé

In the present invention, a Fourier transform unit (11) performs Fourier transform on a filter coefficient output from an adaptive equalization unit (6) that is constituted by a finite impulse response filter of N taps (N is an integer of 2 or more) in a time direction. An eigenvalue sum calculation unit (15) integrates the result of differentiating the Fourier-transformed filter coefficient by a frequency with a complex conjugate of the Fourier-transformed filter coefficient to calculate a matrix, and then calculates the sum of two eigenvalues of the matrix. A proportionality coefficient calculation unit (14) calculates a proportionality coefficient relative to the frequency from the sum of the two eigenvalues.

Classes IPC  ?

• H04B 10/079 - Dispositions pour la surveillance ou le test de systèmes de transmissionDispositions pour la mesure des défauts de systèmes de transmission utilisant un signal en service utilisant des mesures du signal de données
• G01M 11/02 - Test des propriétés optiques
• H04B 3/06 - Réglage de la transmissionÉgalisation par le signal transmis
• H04B 10/2513 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion due à la dispersion chromatique

Abrégé

Before completion of merge encoding processing of an immediately preceding PU, a controller determines the order of evaluation of merge candidates with the immediately preceding PU excluded from the merge candidates to be evaluated, and a merge-candidate derivation part evaluates each merge candidate in the order of evaluation. After the completion of the merge encoding processing of the immediately preceding PU, the controller re-determines the order of evaluation of merge candidates with the immediately preceding PU included in the merge candidates to be evaluated, and the merge-candidate derivation part evaluates each merge candidate in the re-determined order of evaluation excluding the merge candidate whose evaluation has already been started.

Classes IPC  ?

• H04N 11/02 - Systèmes de télévision en couleurs avec réduction de la largeur de bande
• H04N 19/50 - Procédés ou dispositions pour le codage, le décodage, la compression ou la décompression de signaux vidéo numériques utilisant le codage prédictif
• H04N 19/172 - Procédés ou dispositions pour le codage, le décodage, la compression ou la décompression de signaux vidéo numériques utilisant le codage adaptatif caractérisés par l’unité de codage, c.-à-d. la partie structurelle ou sémantique du signal vidéo étant l’objet ou le sujet du codage adaptatif l’unité étant une zone de l'image, p. ex. un objet la zone étant une image, une trame ou un champ
• H04N 19/90 - Procédés ou dispositions pour le codage, le décodage, la compression ou la décompression de signaux vidéo numériques utilisant des techniques de codage non prévues dans les groupes , p. ex. les fractales