SIMULTANEOUS BANDWIDTH EXTENSION AT HIGH GAIN AND PEAKING REDUCTION AT MINIMUM GAIN FOR WIDEBAND, VARIABLE GAIN, LINEAR OPTICAL RECEIVERS

摘要

An optical communication system, a linear optical receiver, and an Integrated Circuit (IC) chip are disclosed, among other things. One example of the disclosed IC chip includes a transimpedance amplifier that receives an input electrical signal from a photodiode and provides an amplified version of the input electrical signal as an output, at least one variable gain amplifier that receives the amplified electrical signal output by the transimpedance amplifier and a bandwidth control mechanism that extends a bandwidth of the second amplified output at a maximum gain of the second amplification phase and also reduces a peaking of the second amplified output at a minimum gain of the second amplification phase.

主权项

1. An optical communication system, comprising:
a photodiode configured to receive light energy and convert the light energy into an electrical signal; a first amplification stage that receives the electrical signal output by the photodiode and produces a first amplified output of the electrical signal received from the photodiode; a second amplification stage that receives the first amplified output of the first amplification stage and produces a second amplified output of the first amplified output received from the first amplification stage; a gain controller that controls a gain of the second amplification stage based on a control signal input to the second amplification stage; and at least one capacitive element that extends a bandwidth of the second amplified output at a maximum gain of the second amplification stage and also reduces a peaking of the second amplified output at a minimum gain of the second amplification stage.