A DC-coupled burst-mode optical receiver is described. The optical receiver may include an input node that receives a current, e.g., from an optoelectronic converter (such as a photodiode). Moreover, the optical receiver may include a current amplifier, coupled to the input node, that provides an output current based at least in part on the current, where the current amplifier has a shunt feedback path that reduces a bias sensitivity of the current amplifier and a feed-forward path that reduces a DC bias current of the current amplifier. Furthermore, the optical receiver may include a TIA, electrically coupled to the current amplifier, that converts the output current to an output voltage. Additionally, the optical receiver may include a feedback loop coupling an output of the TIA to an input of the feed-forward path.

An integrated circuit that includes an optical receiver is described. This integrated circuit may include an optical receiver. The optical receiver may include a photodiode that receives an optical signal and that outputs a corresponding current. Moreover, the optical receiver may include an inductor that is electrically coupled to the photodiode. Furthermore, the optical receiver may include a resistive analog front-end stage that is electrically coupled to the inductor. Note that the inductor may have a resistance per unit length that is greater than a first threshold value (such as 40 m/m), and the inductor may be approximately dispersion-less. For example, a Q factor for inductive peaking associated with the inductor is less than a second threshold value (such as 5).

An optical data circuit includes threshold adjustment circuits to perform threshold adjustment compensation of asymmetrical optical noise. The optical data circuit includes an optical-to-electrical conversion circuit configured to produce first and second differential electrical data signals, at respective first and second electrical nodes, in response to an optical data signal. First and second digital-to-analog converter (DAC) circuits are each respectively coupled to the first and second electrical nodes and configured to respectively generate first and second adjustment signals. The first and second DAC circuits are configured to adjust the first and second differential electrical data signals such that a zero-crossing point of positive data is pulled up in response to the first adjustment signal and a zero-crossing point of negative data is pulled down in response to the second adjustment signal.

A reconfigurable and timely accurate method of generating, with a low latency, an output signal in response to multiple input signals, wherein said input signals occur at independent times, and wherein the occurrence of several input signals according to predetermined pattern is interpreted as a Super Event and wherein a detected Super Event triggers the production of a specific output signal heralding this Super Event, characterized in that said method comprises a first step of time acquisition of the occurrence of said input signals, a second step of adaptation of the acquisition data flow to the clock of the reconfigurable processing unit, a third step of determining the occurrence of a Super Event by comparing the events pattern to the super event definition, a fourth step identifying the Super Event and generating at least one event/signal corresponding to at least one trigger signal, a fifth step of adaptation of the generation data flow to the asynchronous generation device, a sixth step of applying a predefined delay for the issue of the at least one trigger signal, and an seventh step of outputting at least one output signal representing a trigger signal and sending it to a downstream unit.

An optical data circuit includes threshold adjustment circuits to perform threshold adjustment compensation of asymmetrical optical noise. The optical data circuit includes an optical-to-electrical conversion circuit configured to produce first and second differential electrical data signals, at respective first and second electrical nodes, in response to an optical data signal. First and second digital-to-analog converter (DAC) circuits are each respectively coupled to the first and second electrical nodes and configured to respectively generate first and second adjustment signals. The first and second DAC circuits are configured to adjust the first and second differential electrical data signals such that a zero-crossing point of positive data is pulled up in response to the first adjustment signal and a zero-crossing point of negative data is pulled down in response to the second adjustment signal.

A PAM reception circuit includes a first comparison circuit that outputs a first bit value in two-bit values based on a result of a comparison between a reception signal of pulse amplitude modulation 4 in which the two-bit values are associated with four potential levels divided by three threshold values by gray codes and a first threshold value which is a center of the three threshold values, an absolute value circuit that outputs an absolute value of a difference between the reception signal and the first threshold value or a negative value obtained by inverting a sign of the absolute value from a positive sign to a negative sign, and a second comparison circuit that outputs a second bit value in the two-bit values based on a result of a comparison between a second threshold value which is larger than the first threshold value in the three threshold values.

The present invention is directed to data communication system and methods. More specifically, various embodiments of the present invention provide a communication interface that is configured to transfer data at high bandwidth using PAM format(s) over optical communication networks. A feedback mechanism is provided for adjusting the transmission power levels. There are other embodiments as well.

Provided is an optical receiver module which includes a conversion unit which converts an input optical signal to an electrical signal, an amplification unit which amplifies the electrical signal and outputs an amplified signal, a reception unit which directly or indirectly receives the amplified signal, and an offsetting unit which offsets the electrical signal such that a difference between a center of an intensity width of the electrical signal and a center of an intensity range of a signal capable of being received by the reception unit becomes small.

[Problem] To provide a monitoring system capable of monitoring, without stopping operations for a long period of time, a change of the characteristics of an apparatus to be subjected to characteristic measurement, to which high frequency signals are inputted. [Solution] A signal to be monitored and a reference signal are inputted to an input unit 11, and the input unit inputs one of the inputted signals to an apparatus 15 to be subjected to characteristic measurement. On the basis of an output signal of the apparatus 15 and the reference signal in the cases where the reference signal is inputted to the apparatus, an input/output characteristic calculation unit 12 calculates the input/output characteristics of the apparatus 15. On the basis of calculation results obtained from the input/output characteristic calculation unit 12, a correction result generating unit 13 generates a correction result signal that indicates the results obtained by correcting an output signal of the apparatus 15 in the cases where the signal to be monitored is inputted to the apparatus. On the basis of the correction result signal generated by the correction result generating unit 13, a failure determining unit 14 determines whether the apparatus has a failure.

The present disclosure includes a photodetector element (11) that converts an optical signal into an electric current signal; a transimpedance amplifier (12a) that converts the electric current signal into a voltage signal; a differential amplifier (12d) that converts the voltage signal into a differential signal, by performing differential amplification of a difference between the voltage signal and a threshold voltage; an LOS detection circuit that detects a no-signal section of the optical signal; and an MCU that repeatedly executes offset cancellation processing, the offset cancellation processing including threshold voltage change processing in which the threshold voltage is changed such that an offset voltage of the differential signal is reduced, the MCU 13 skipping the threshold voltage change processing in the no-signal section.