Patent ID: 6768580
Filing Date: 2004-07-27
Classification: H01S

Abstract:
An optical amplifying device, comprising first and second optical amplifiers for respectively amplifying first and second signal lights received on first and second transmission paths, respectively, from first and second signal sources, respectively, wherein:said first optical amplifier comprises a first reflector and a first optical wavelength multiplexer/demultiplexer, said first optical wavelength multiplexer/demultiplexer separating light of a first particular wavelength from the first signal light and applying the first separated light to said first reflector to be reflected thereby, returned to said first multiplexer/demultiplexer, and applied therefrom to a second multiplexer/demultiplexer, said second multiplexer/demultiplexer multiplexing the first separated light with the second signal light and applying the resulting light to the first signal source; and said second optical amplifier comprises a second reflector and said second optical wavelength multiplexer/demultiplexer, said second optical wavelength multiplexer/demultiplexer separating light of a second particular wavelength from the second signal light and applying the second separated light to said second reflector to be reflected thereby, returned to said second multiplexer/demultiplexer, and applied therefrom to said first multiplexer/demultiplexer, said first multiplexer/demultiplexer multiplexing the second separated light with the first signal light and applying the resulting light to the second signal source.