Patent ID: 6091541
Filing Date: 2000-07-18
Classification: H01S,H04B

Abstract:
A multichannel 3-stage optical fiber amplifier, comprising:first amplification means for amplifying input multichannel multiplexed signal light to provide amplified signal light;gain equalization means for equalizing gains by causing a different amount of loss for each of a plurality of channels of the amplified signal light to provide a signal light output; andsecond amplification means for amplifying the signal light output from the gain equalization means;wherein said second amplification means comprises:an erbium doped filter (EDF) for amplifying the signal light output of the gain equalization means;a first coupler connected to said EDF for outputting amplified signal light from the EDF;a second coupler connected to said first coupler for dividing the amplified signal light in accordance with a predetermined ratio; anda filter connected to said second coupler for extracting a signal light having a wavelength out of a wavelength range of a multichannel signal light from one part of the amplified signal light divided by said second coupler to provide an output of said filter.