Optical amplifier using fiber amplifier has module for variable or fixed damping between amplifier modules with fiber and semiconducting amplifiers or three-stage system

摘要

The optical amplifier has two or three amplifier modules in series, the first (V1) having a fiber amplifier (EDFA) followed by a module for variable or fixed damping (VOA). The second (V2) has an optical semiconducting amplifier (SOA). First and third amplifier modules have fiber amplifiers and the second has an optical semiconducting amplifier, with variable damping modules between the first and second and second and third amplifier modules.