A photoelectric conversion device includes an amplifier, a photodetector, a first resistor, a second resistor, a first switch, a first terminal, a second terminal, a second switch, a third switch, and a controller. In setting a gain of the amplifier to a second gain, the controller is configured to control the first switch and the third switch to a conducting state and control the second switch to a non-conducting state. In setting the gain of the amplifier to a first gain, the controller is configured to control the first switch and the third switch to the non-conducting state and control the second switch to the conducting state so as to set a potential at one end and a potential at the other end to be equal in the first switch.

A reception circuit includes an input terminal configured to receive an input current; a voltage signal circuit being configured to convert a current signal into a voltage signal; a reference voltage circuit configured to generate a reference voltage in accordance with a first feedback current; a differential amplifier circuit configured to generate a differential signal in accordance with a voltage difference between the voltage signal and the reference voltage; and an offset control circuit configured to generate the first feedback current and a second feedback current, adjust the first feedback current when the voltage signal has an average voltage value greater than the reference voltage, and subtract the second feedback current from the input current such that the offset of the differential signal falls within the tolerance when the voltage signal has an average voltage value smaller than the reference voltage.

An optical module includes an optical receiver with a complementary metal-oxide semiconductor (CMOS) transimpedance amplifier (TIA) and a digital signal processing (DSP) circuit. The DSP circuit is integrated with the CMOS TIA and facilitates adaptability of the CMOS TIA, and the CMOS TIA can adapt by using information provided by the DSP circuit.

Adjustments to gain levels, associated with amplifiers, including partial adjustments to gain levels associated with certain amplifiers can be controlled and performed in accordance with an amplifier gain adjustment sequence. In response to determining that an overall gain level associated with a group of amplifiers, comprising first, second, and third amplifiers, is to be reduced, AGC component can determine whether a third gain level associated with the third amplifier is at a minimum. In response to determining that third gain level is at minimum, AGC component can determine which of a first gain level associated with the first amplifier and a second gain level associated with the second amplifier is to be partially reduced, in accordance with the amplifier gain adjustment sequence that, in part, specifies alternating between partial first gain level reductions associated with the first amplifier and partial second gain level reductions associated with the second amplifier.

An assembly of electronic components for reception of data using an optical fiber wherein data is received in bursts, the assembly comprising: a photodiode; a transimpedance amplifier coupled to said photodiode, the gain of the transimpedance amplifier being adjusted based on a level of a gain control signal: a received input signal sensor configured to sense a received input signal level and provide the gain control signal, the gain control signal being varied according to the received input signal level; wherein the received input signal level is sensed via a sampling circuit arrangement; a comparator; and an adjustor for adjusting a low-frequency behavior and a high-frequency behavior of the comparator so that the detection of both positive data symbol level transitions and negative data symbol level transitions in the received signal have identical behavior within accepted engineering tolerances.

An assembly of electronic components for reception of data using an optical fiber wherein data is received in bursts, the assembly including: a photodiode; a transimpedance amplifier coupled to said photodiode, wherein a gain of the transimpedance amplifier is adjusted based on a level of a gain control signal; a received input signal sensor configured to sense a received input signal level; and a signal preamble detector configured to detect the end of at least one of said preamble patterns in a data burst conveyed in said received signal and further configured to generate said settling control signal as an output.

An assembly of electronic components for reception of data using an optical fibre wherein data is received in bursts, and wherein the assembly includes: a photodiode; a transimpedance amplifier coupled to the photodiode, wherein a gain of the transimpedance amplifier is adjusted based on a level of a gain control signal.

A variable transimpedance amplifier may include first and second amplifiers. Each of the first and second amplifiers may include a transistor amplifier with a feedback resistor and a capacitor. The output node of the first amplifier may be an output node of the variable transimpedance amplifier. The output node of the second amplifier is not part of the output node of the variable transimpedance amplifier. The open loop gains of the transistor amplifiers may be variable, but the feedback resistor values can be fixed. The transimpedance may be determined by the feedback resistors and a scaling factor proportional to ratio of open loop gains. The transistor amplifiers may share an input transistor. The configuration can provide a high dynamic range of variable transimpedance that is stable over process and operating condition variations, minimize input capacitance loading and noise contribution to small input signals.

An optical receiver and a linear receiver pluggable optics (LRO) module are disclosed. The optical receiver includes a photodiode, a transimpedance amplifier (TIA), and a variable gain stage with multiple amplifiers. The optical receiver features dual output buffers for signal distribution to a HOST serializer/deserializer and a re-timer or digital signal processor (DSP). A switch controls the second output buffer without causing bit errors. The LRO module connects to a remote transmitter and includes a photodiode, TIA, and DSP for signal processing. The optical receiver supports advanced monitoring and testing through multiple test points. The module's design ensures efficient signal conversion and transmission, with the ability to toggle re-timers without introducing errors. The system is designed for high-performance optical communication, offering flexibility and reliability in signal handling and processing.

An active clamp photoelectric sensing device includes an input terminal, a first output terminal, a current-to-voltage conversion circuit, and an active clamp circuit. The input terminal receives an input current. The first output terminal outputs a first output voltage. The current-to-voltage conversion circuit is coupled between the input terminal and the first output terminal, and is used to discharge and lower potentials of the input terminal and the first output terminal to a first set voltage according to the state of a reset signal, or is used to gradually increase the first output voltage to a second set voltage. The active clamping circuit is coupled to the current-to-voltage conversion circuit, and is used to clamp the upper limit of the first output voltage to the second set voltage.