Advanced erbium-doped fibre amplifiers: channel equalisers

A passive WDM channel equalizer using a twin-core EDFA is studied in detail. Gain saturation limits the range of input signal powers from approximately -20 dBm to approximately 0 dBm. Channel equalization rates as high as 0.35 dB/dB are predicted. When used in cascade, twin-core EDFAs are shown to provide channel power stabilization and self-healing against additional channel losses