Lightwave systems using optical amplifiers.

摘要

A single frequency lightwave system employs semiconductor, optical amplifiers arranged in tandem with suitable noise filtering and isolation between amplifier stages. Feedback control maintains overlap between the signal frequency and one of the passbands of the amplifiers. Either direct detection or coherent detection can be used. Also described is a receiver front end which includes such an amplifier between the incoming signal and a photodetector. Both transmission systems and switching systems are described.