Patent ID: 6094298
Filing Date: 2000-07-25
Classification: H01S

Abstract:
A coherent optical communication transmission system, comprising:light sources connected to provide narrowband light signals centered around signal wavelengths .lambda..sub.Sn,optical multiplexers connected to multiplex said light signals onto optical fibers,demultiplexers connected to demultiplex said light signals,optical receivers connected to receive said demultiplexed light signals from said demultiplexers, anda laser cavity gain controlled EDFA connected to provide gain for said light signals, wherein said laser cavity gain controlled EDFA includesan EDFA connected to receive a plurality of narrowband light signals having wavelengths centered on signal wavelengths .lambda..sub.Sn, anda laser cavity connected so as to provide the EDFA with negative feedback and thereby clamp the gain of said EDFA, the lasing wavelength of said laser cavity being selected such that the saturation power at the laser wavelength is less than that at the signal wavelengths.