Patent ID: 6236482
Filing Date: 2001-05-22
Classification: H04B,H04J

Abstract:
A wavelength division multiplexed (WDM) communication system comprising:a first stage optical amplifier for collectively amplifying WDM optical signals;means for demulitplexing an output of said first stage optical amplifier into plural groups of one or more optical signals, said plural groups of optical signals having varying power levels;a first plurality of optical band pass filters comprising one of fiber Bragg grating optical filters and dielectric optical filters, for filtering said plural groups of one or more optical signals;plural second stage optical amplifiers for respectively amplifying said plural groups of one or more optical signals with a gain such that each of said plural groups has a same power level;a second plurality of optical band pass filters comprising one of fiber Bragg gratings, optical filters and dielectric optical filters for filtering said plural groups of one or more optical signals output from said plural second stage optical amplifiers; andmeans for multiplexing outputs of said second plurality of optical band pass filters.