Abrégé

An assembly of electronic components providing means for reception of data using an optical fibre wherein said assembly comprises: a photodiode; an amplifier coupled to said photodiode a printed circuit board, said photodiode and amplifier physically mounted on a first side of said printed circuit board; and a stiffener attached to said printed circuit board, wherein said stiffener is attached in a region approximately concentric with said region of said printed circuit board whereon said photodiode and amplifier are mounted, and conducting bond wires configured to directly couple said amplifier and said photodiode to conducting traces on a second opposite side of said printed circuit board with respect to said amplifier and said photodiode; and a fibre alignment ferrule and lens cap assembly, wherein said fibre alignment ferrule and lens cap assembly comprises: a ferrule which is configured to configured to provide a receptacle with defined physical alignment for an optical fibre; a lens which is configured to focus light from said optical fibre on to said photodiode; a cover region configured to provide an hermetic seal for said amplifier and said photodiode, wherein said fibre alignment ferrule and lens cap assembly is configured to be physically attached to said printed circuit board so as to provide an hermetic seal for said photodiode and amplifier and to further align said lens within said fibre alignment ferrule and lens cap assembly so as to focus light from said optical fibre onto said photodiode.

Classes IPC  ?

• G02B 6/42 - Couplage de guides de lumière avec des éléments opto-électroniques

Abrégé

Assemblies of electronic components for reception of data using optical fibre and methods for providing same. Assemblies comprise a photodiode; an amplifier coupled to the photodiode; at least one feedback resistor coupled between the input and output of the amplifier; an arrangement of at least two MOS transistors of same channel polarity and configured in parallel with the feedback resistor(s); a system for sensing received input signal level and applying a bias voltage to gates of the MOS transistors, the bias voltage varied according to the received input signal level to control a resistance apparent through the arrangement of MOS transistors; at least one capacitor configured to couple signals from the amplifier output to a gate of at least one of the MOS transistors; and at least one bias resistor configured to couple the bias voltage to a gate of at least one of the MOS transistors.

Classes IPC  ?

• H04B 10/60 - Récepteurs
• H03F 3/45 - Amplificateurs différentiels
• H04B 10/25 - Dispositions spécifiques à la transmission par fibres

Abrégé

An assembly of electronic components for reception of data using an optical fibre wherein said assembly comprises: a photodiode; a first amplifier coupled to said photodiode; a second amplifier, whose electrical behaviour is substantially identical to an electrical behaviour of said first amplifier; an impedance network comprising at least two electronic components coupled between an input of said second amplifier and a reference terminal, wherein those at least two electronic components comprise at least two impedance elements, one impedance element being capacitive and another being resistive or inductive, and wherein said at least two electronic components are adjustable under electronic control to adjust the impedance presented by said impedance network; and circuitry for creating a signal formed from a subtraction of outputs of the first and second amplifiers.

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
• G02B 6/42 - Couplage de guides de lumière avec des éléments opto-électroniques

Abrégé

Systems and methods for controlling laser modulation in burst communications. In a start-up phase, a drive circuitry sequentially applies first and second drive currents to a laser diode such that it produces a first and second optical output, respectively. A compensating current source coupled to the laser diode provides a current related to the first and second drive currents to maintain a combined current flowing through an impedance connected to the laser diode at a substantially constant level during the start-up phase. An optical sensor measures the first and second optical outputs, and a controller uses values of the first and second drive currents, the outputs from the optical sensor, and at least one supplied input value to provide control values for the drive circuitry for controlling operating current of the laser diode during a subsequent operating phase, wherein information is transmitted in at least one burst.

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
• H01S 5/06 - Dispositions pour commander les paramètres de sortie du laser, p. ex. en agissant sur le milieu actif
• 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
• H01S 5/0683 - Stabilisation des paramètres de sortie du laser en surveillant les paramètres optiques de sortie
• H04B 10/50 - Émetteurs
• H04B 10/516 - Détails du codage ou de la modulation

Abrégé

A construction and configuration for the receiving function of a high speed optical communication system with reduced manufacturing cost and improved performance. In an aspect, mounting the cover and lens provides a self-alignment behaviour that advantageously positions the cover and the lens to be in the optimum position for the photodiode. An assembly of electronic components receives data using an optical fibre. In one aspect, the assembly includes a photodiode, an amplifier coupled to the photodiode, and a printed circuit board on which the photodiode and amplifier are physically mounted, The printed circuit board has areas of a first material to which components may be attached using a fixing agent, and areas of a second material to which components will not attach using the fixing agent. Conductive bond wires are configured to directly couple the amplifier and the photodiode to conductive traces on an opposite side of the printed circuit board. A cover is configured to cover the amplifier and the photodiode, and is physically attached to the printed circuit board to provide mechanical rigidity around the photodiode and the amplifier. The cover has an optically transparent aperture containing a lens configured to focus modulated light signals from a fibre onto the photodiode. The printed circuit board has areas of a first material and second material configured to fix a location of the cover by use of the fixing agent to align the lens to focus the light signals from the fibre onto the photodiode.

Classes IPC  ?

• H04B 10/69 - Dispositions électriques dans le récepteur
• H04B 10/25 - Dispositions spécifiques à la transmission par fibres
• G02B 6/42 - Couplage de guides de lumière avec des éléments opto-électroniques

Abrégé

An assembly of electronic components enabling reception of data using an optical fiber includes: a photodiode; an amplifier coupled to the photodiode; a flexible printed circuit board, the photodiode and amplifier physically mounted on the flexible printed circuit board; a cover, the cover configured to cover the photodiode and the amplifier, wherein the cover is physically attached to the printed circuit board so as to provide mechanical rigidity around the photodiode, and the cover having an optically transparent aperture containing a lens configured to focus modulated light signals from a fiber onto the photodiode; and conductive bond wires configured to directly electrically couple the amplifier and the photodiode to conducting traces of the flexible printed circuit board.

Classes IPC  ?

• G02B 6/42 - Couplage de guides de lumière avec des éléments opto-électroniques
• H05K 1/11 - Éléments imprimés pour réaliser des connexions électriques avec ou entre des circuits imprimés
• H05K 1/18 - Circuits imprimés associés structurellement à des composants électriques non imprimés

Abrégé

A system for transmitting a sequence of at least two data bursts in a fibre optical communications system includes: selection circuitry configured to select one of a data input value, a logical high value or a logical low value such that the selection circuitry selects the data input value during a data transmission period during a defined burst period and selects one of the logical high value and the logical low value during an extension time period during the defined burst period and immediately following the data transmission period, such that for the sequence of at least two bursts, at least one burst has a logical low value extension period and at least one burst has a logical high value extension period; drive circuitry configured to apply a current to a laser diode, the current corresponding to the value selected by the selection circuitry during the defined burst period or a zero value otherwise, the current being such that the laser diode is configured to provide an optical output; an optical sensor module configured to provide a sensor module output corresponding to the optical output of the laser diode; wherein the sensor module output is configured to provide an electrical output proportional to the laser diode's optical output corresponding to the logical high value and the logical low value in the sequence of at least two bursts, and further configured to provide an output corresponding to an average value of the sensor module output during only the data transmission period during the sequence of bursts; and a controller configured to receive values regarding desired minimum and maximum optical output power levels of the laser diode and to receive the electrical output from the optical sensor module proportional to the optical output power level corresponding to the logical high and the logical low values, and to receive the output corresponding to the average value of the sensor module output during only the data transmission period during the sequence of bursts; wherein the controller is configured to use the received information to provide control values for the drive circuitry.

Classes IPC  ?

• H04B 10/564 - Commande de la puissance
• H01S 5/0683 - Stabilisation des paramètres de sortie du laser en surveillant les paramètres optiques de sortie
• H04B 10/50 - Émetteurs
• H01S 3/13 - Stabilisation de paramètres de sortie de laser, p. ex. fréquence ou amplitude
• H01S 5/042 - Excitation électrique
• H01S 5/06 - Dispositions pour commander les paramètres de sortie du laser, p. ex. en agissant sur le milieu actif
• 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 system for controlling an optical data transmitter includes control circuitry comprising a voltage controlled current source configured to generate a reference current configured to generate at least two output currents whose magnitudes are in a fixed ratio wherein at least one of said output currents is used by said control circuitry to control current driver circuitry, a first plurality of serially coupled resistors, a first plurality of switches, a second plurality of serially coupled resistors, a second plurality of switches, and a look-up-table configured to control the first plurality of switches and the second plurality of switches based on an input to control a ratio.

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
• H04B 10/50 - Émetteurs
• H01S 5/0683 - Stabilisation des paramètres de sortie du laser en surveillant les paramètres optiques de sortie
• H04B 10/564 - Commande de la puissance
• H04B 10/54 - Modulation d'intensité
• H01S 5/042 - Excitation électrique
• H01S 5/06 - Dispositions pour commander les paramètres de sortie du laser, p. ex. en agissant sur le milieu actif

Abrégé

A system for controlling an optical data transmitter comprising: current driver circuitry configured to supply a drive current to a laser diode; and monitor circuitry, said monitor circuitry comprising: a photodiode; and a first transimpedance amplifier coupled to said photodiode, wherein said monitor circuity is configured to provide an output signal related to an optical intensity of said laser diode; a second transimpedance amplifier, said second transimpedance amplifier configured to be substantially identical in construction to said first transimpedance amplifier; control circuitry configured to control said current driver circuitry configured to compare at least one property of outputs of said first and second transimpedance amplifiers, and generate at least one control signal to control said current driver circuitry based on the comparison, wherein the control circuitry comprises a reference current generator which comprises: a defined current source; a voltage controlled current source configured to generate said reference current configured to generate at least two output currents whose magnitudes are in a fixed ratio wherein at least one of said output currents is used by said control circuitry to control said current driver circuitry; a first plurality of serially coupled resistors, each resistor from the first plurality of serially coupled resistors being a unit resistor and configured such that one end of the first plurality of serially coupled resistors is coupled to a first reference voltage; and a first plurality of switches, configured such that at least one switch of the first plurality of switches is associated with one of the first plurality of serially coupled resistors, and configured to couple a resistor from the first plurality of serially coupled resistors to the defined current source and a first controlling input terminal of the voltage controlled current source to a same resistor from the first plurality of serially coupled resistors; a second plurality of serially coupled resistors, each resistor of the second plurality of resistors being a unit resistor whose resistance is substantially identical to the unit resistors in the said first plurality of serially coupled resistors and configured such that one end of the second plurality of serially coupled resistors is coupled to the said reference voltage; a second plurality of switches, configured such that at least one switch of the second plurality of switches is associated with one of the second plurality of serially coupled resistors, and configured to couple a resistor from the second plurality of serially coupled resistors to a first output current from the voltage controlled current source and a first second controlling input terminal of the voltage controlled current source to a same resistor from the second plurality of serially coupled resistors; and a look-up-table configured to control the first plurality of switches and the second plurality of switches based on an input to control a ratio between the defined current source current and at least one of the voltage controlled current source output current.

Classes IPC  ?

• H04B 10/50 - Émetteurs
• H01S 5/0683 - Stabilisation des paramètres de sortie du laser en surveillant les paramètres optiques de sortie

Abrégé

A system for controlling an optical intensity and modulation of an optical data transmitter which includes current driver circuitry configured to provide a drive current to a laser diode wherein said current comprises a fixed component and a modulated component, said modulated component having a magnitude related to an input data stream. The monitor circuitry contains a photodiode and a first transimpedance amplifier coupled to said photodiode, said monitor circuitry configured to provide an output signal related to an optical intensity of said laser diode. The system further includes replica monitor circuitry containing a replica capacitor with a replica capacitance and a second transimpedance amplifier configured to be substantially identical in construction to said first transimpedance amplifier, said second transimpedance amplifier coupled to said replica capacitor. The system further includes replica capacitance control circuitry configured to control said replica capacitance of said replica capacitor to match a capacitance associated with said photodiode.

Classes IPC  ?

• H01S 5/0683 - Stabilisation des paramètres de sortie du laser en surveillant les paramètres optiques de sortie
• H04B 10/50 - Émetteurs
• H01S 5/042 - Excitation électrique

Abrégé

A laser power controller employs: selection circuitry configured to select one of a data input value, a logical high value or a logical low value such that the selection circuitry selects the data input value during a data transmission period during a defined burst period and selects one of the logical high value and the logical low value during an extension time period during the defined burst period and immediately following the data transmission period; drive circuitry configured to apply, to a laser diode, a current corresponding to the value selected by the selection circuitry during the defined burst period or a zero value otherwise, the current being such that the laser diode is configured to provide an optical output; an optical sensor module configured to provide a sensor module output corresponding to the optical output of the laser diode, and configured to provide an electrical output proportional to the laser diode's optical output corresponding to the logical high value or the logical low value; and a controller configured to receive desired values regarding minimum and maximum optical output power levels of the laser diode and to receive the electrical output from the optical sensor module proportional to the optical output power level corresponding to the logical high and the logical low values; the controller being configured to use the received information to provide control values for the drive circuitry.

Classes IPC  ?

• H04B 10/564 - Commande de la puissance
• H01S 5/0683 - Stabilisation des paramètres de sortie du laser en surveillant les paramètres optiques de sortie
• H01S 5/068 - Stabilisation des paramètres de sortie du laser
• H01S 5/042 - Excitation électrique
• H01S 3/13 - Stabilisation de paramètres de sortie de laser, p. ex. fréquence ou amplitude
• H04B 10/50 - Émetteurs

Abrégé

A system comprises selection circuitry (610) configured to select one of a data input value, a logical high value or a logical low value such that the selection circuitry selects the data input value during a data transmission period during a defined burst period and selects one of the logical high value and the logical low value during an extension time period during the defined burst period and immediately following the data transmission period; drive circuitry configured to apply a current to a laser diode (101), the current corresponding to the value selected by the selection circuitry during the defined burst period or a zero value otherwise, the current being such that the laser diode is configured to provide an optical output; an optical sensor module (102) configured to provide a sensor module output corresponding to the optical output of the laser diode; wherein the sensor module output is configured to provide an electrical output proportional to the laser diode's optical output corresponding to the logical high value or the logical low value; a controller (604) configured to receive desired values regarding minimum and maximum optical output power levels of the laser diode and to receive the electrical output from the optical sensor module proportional to the optical output power level corresponding to the logical high and the logical low values; wherein the controller is configured to use the received information to provide control values for the drive circuitry.

Classes IPC  ?

• H01S 5/0683 - Stabilisation des paramètres de sortie du laser en surveillant les paramètres optiques de sortie

Abrégé

A system comprising drive circuitry configured to apply in a start-up phase a first drive current and then a second different drive current to a laser diode, the first drive current and second drive current being such that the laser diode is configured to provide a first optical output and a second optical output respectively. The system further comprising an optical sensor configured to provide a first sensor output corresponding to the first optical output of the laser diode and a second sensor output corresponding to the second optical output. The system further comprises a controller configured to use a value of the first drive current, a value of the second drive current, the first sensor output, the second sensor output and at least one supplied input value to provide control values for the drive circuitry to control an operating current of the laser diode, wherein the system is arranged to be used in a communication system wherein information is transmitted in at least one burst.

Classes IPC  ?

• H01S 5/042 - Excitation électrique
• H01S 5/0683 - Stabilisation des paramètres de sortie du laser en surveillant les paramètres optiques de sortie
• H01S 5/068 - Stabilisation des paramètres de sortie du laser
• H04B 10/25 - Dispositions spécifiques à la transmission par fibres
• H04B 10/50 - Émetteurs

Abrégé

A trans-impedance amplifier arrangement has an input configured to receive an output from a photo-detector, a current monitoring circuit configured in use to provide a current monitor signal dependent on a current through the photo-detector, and an output configured to output said current monitor signal to a control module, said output further configured to receive control information from said control module. A control module is configured to receive the current monitor signal and to provide the control information.

Classes IPC  ?

• H04B 10/69 - Dispositions électriques dans le récepteur
• 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
• H03G 3/30 - Commande automatique dans des amplificateurs comportant des dispositifs semi-conducteurs

Abrégé

Trans-impedance amplifier circuitry having an amplifier; a feedback resistor arranged between an output of the amplifier and an input of the amplifier; and at least one further resistor arranged physically parallel to the feedback resistor.

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 1/02 - Modifications des amplificateurs pour augmenter leur rendement, p. ex. étages classe A à pente glissante, utilisation d'une oscillation auxiliaire
• H03F 3/45 - Amplificateurs différentiels
• 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
• H03F 1/52 - Circuits pour la protection de ces amplificateurs