Finisar Corporation

Dan Case

Andreas G Weber

Giorgio Giaretta

Lewis B Aronson

Mark J Farley

Rudy Hofmeister

Christopher J Madden

Tom Lenosky

Gilles P Denoyer

A transceiver module having integrated eye diagram opening functionality for reducing jitter is described. The transceiver module may include a transmitter eye opener and a receiver eye opener integrated in a single circuit. The transceiver module may also include serial control and various other integrated components. Other functionalities that may be integrated on the transceiver module include loopback modes, bypass features, bit error rate testing, and power down modes.

Transceiver module and integrated circuit with dual eye openers

An optical transceiver module having digital control of laser current peaking is disclosed. The optical transceiver module comprises a controller and integrated post-amplifier/laser driver, which are included on a printed circuit board disposed in the module. Transmitting and receiving optical sub-assemblies are also disposed in the module. A digital signal interface interconnects the controller with the integrated post-amplifier/laser driver. Digital control signals produced by the controller are transmitted via the digital signal interface to the integrated post-amplifier/laser driver, where they are converted to analog control signals. The analog control signals are forwarded to control components responsible for governing the electrical current supplied to the laser of the transmitting optical sub-assembly. The laser current is intermittently peaked by the control signal in order to hasten the transition from light to no-light emission, thereby improving laser response and performance.

Control of peaking of laser driver current to improve eye quality

A transceiver module having integrated eye diagram opening functionality for reducing jitter is described. The transceiver module may include a transmitter eye opener and a receiver eye opener integrated in single circuit. The transceiver module may also include serial control and various other integrated components. Other functionalities that may be integrated on the transceiver module include loopback modules, bypass features, bit error rate testing, and power down modes.

Transceiver module and integrated circuit with dual eye openers and integrated loopback and bit error rate testing

A transceiver module having intergrated eye diagram opening functionality for reducing jitter is describe. The transceiver module may transmitter eye opener and a receiver eye opener integrated in a single circuit. The transceiver module may also include serial control and various other integrated components. Other functionalities that may be integrated on the transceiver module include loopback modes, bypass features, bit error rate testing, and power down mode.

Transceiver module and integrated circuit with multi-rate eye openers and bypass

An optical transceiver module having a multiplexing analog control interface. The optical transceiver module comprises a controller and integrated post-amplifier/laser driver, which are included on a printed circuit board associated with the module. Transmitting and receiving optical sub-assemblies are also included in the module. A time division multiplexing analog control signal interface interconnects the controller with the integrated post-amplifier/laser driver. Digital control signals produced by the controller are converted and combined into a multiplexed analog control signal and transmitted via the interface to the integrated post-amplifier/laser driver. After receipt by the integrated post-amplifier/laser driver, the multiplexed analog control signal is divided into discrete analog control signals and forwarded to a plurality of control devices that use the control signals to modify a plurality of operating parameters of the transceiver module. The time division multiplexing analog control signal interface can also be employed to provide feedback to the controller relating to the operation of the control devices.

Time division multiplexing of analog signals in an optical transceiver

An integrated post-amplifier and laser driver assembly is provided that includes a digital control interface for communication with an external digital IC controller having an I2C bus configured to receive signal parameter programming input from a user. The PA/LD includes one or more DACs which communicate with the digital control interface by way of a glue logic module. A memory is provided in the PA/LD that communicates with the DACs by way of the glue logic module and stores an algorithm for facilitating implementation of changes to signal parameters of one or more signals by way of the DACs. Signal parameter programming instructions are received at the PA/LD from a user by way of the I2C bus, and/or from the internally coded algorithm, and are used by the DACs to facilitate implementation of changes to signal parameters of one or more signals.

Transceiver with programmable signal parameters

An optical transceiver device having digital and programmable control over transceiver components is disclosed. The optical transceiver module comprises a controller and an integrated post-amplifier/laser driver ('PA/LD'), which are included on a printed circuit board disposed in the module. Transmitting and receiving optical sub-assemblies for transceiving optical signals are also disposed in the module. A digital signal interface interconnects the controller with the integrated PA/LD. A microprocessor is interposed between the controller and the PA/LD and is connected to both components via the digital signal interface. Digital control signals produced by the controller are transmitted via the digital signal interface to the integrated PA/LD where they are converted to analog signals for use by a plurality of control amplifiers. Conversely, analog feedback signals produced by the control amplifiers are converted to digital signals and transmitted to the controller. The microprocessor can intercept, analyze, and modify the digital control and feedback signals for optimum use by the controller or integrated PA/LD.

Digital and programmable control of optical transceiver elements

An optical transceiver module having a digital control interface is disclosed. The optical transceiver module comprises a controller and integrated post-amplifier/laser driver, which are included on a printed circuit board disposed in the module. Transmitting and receiving optical sub-assemblies are also disposed in the module. A digital signal interface interconnects the controller with the integrated post-amplifier/laser driver. Digital control signals produced by the controller are transmitted via the digital signal interface to the integrated post-amplifier/laser driver. After receipt by the integrated post-amplifier/laser driver, the digital control signals are converted to analog control signals and forwarded to control amplifiers that use the control signals to vary a plurality of operating parameters of the transceiver module. The digital signal interface can also be employed to provide feedback to the controller relating to the operation of the control devices.

Digital control of optical transceiver transmitting and receiving elements

An integrated post-amplifier and laser driver assembly is provided that is implemented as a single integrated circuit and is configured to implement various effects, such as polarity control, concerning data signals received by an optical transceiver in conjunction with which the integrated post-amplifier and laser driver assembly is employed. The data signal polarity control is implemented, both in the post-amplifier assembly and the laser driver assembly, by an amplifier that changes the polarity of the data signal by modifying a relationship between first and second propagation paths of the data signal. The data signal polarity control is typically performed in response to a multiplexed digital control signal received at a digital control interface of the integrated post-amplifier and laser driver assembly.

System and method for controlling polarity of a data signal

An integrated post-amplifier and laser driver assembly is provided that is implemented as a single integrated circuit and includes a plurality of amplifiers or other control devices or circuits configured to implement various effects concerning data signals received and/or transmitted by a transceiver in conjunction with which the integrated post-amplifier and laser driver assembly is employed. A digital control interface is included in the integrated post-amplifier and laser driver assembly and is configured to receive a control signal from an external digital controller. A glue logic module, and associated digital to analog controllers, of the integrated post-amplifier and laser driver assembly parse the control signal and generate and transmit corresponding analog signals to one or more of the amplifiers so as to implement processing of a data signal received from the optical receiver, as well as the control of data transmission by way of a suitable transmitter.

Integrated post-amplifier and laser driver assembly with digital control interface

Integrated circuit with dual eye openers

An optical component, such as an optical receiver, is provided that includes a detector configured to receive a signal from an optical fiber and to communicate with a translationl module of the optical component. A transimpedance amplifier of the optical component is configured to receive an electrical signal from the detector and to transmit an amplified signal to the translation module. The transimpedance amplifier is configured for a controlled low cutoff frequency as optical power to the transimpedance amplifier increases, so that the optical sensitivity of the transimpedance amplifier is not traded for optical overload.

Optical receiver with wide dynamic range transimpedance amplifier

A wide dynamic range transimpedance amplifier for fiber optics receivers. An automatic transimpedance gain control and DC cancellation control feedback circuit include a pnp transistor that is connected with the input signal. The impedance seen at the emitter of the pnp transistor changes according to the average value of the photodiode input current. Thus, large signal amplitudes are attenuated at the input of the transimpedance amplifier by the transistor and small signal amplitudes are amplified. The transistor is a variable impedance that can increase the optical overload without diminishing or reducing the optical sensitivity of the transimpedance amplifier.

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Gilroy, CA, United States of America

Dan Case