Patent ID: 6920261
Filing Date: 2005-07-19
Classification: H04B,H04J

Abstract:
1. A cross phase modulation suppressing device in a wavelength division multiplexing optical transmission system, comprising: an optical circulator which supplies a wavelength multiplexing optical signal entered in a first port to a second port and supplies said wavelength multiplexing optical signal entered in said second port to a third port; a multi/demultiplexer which divides said wavelength multiplexing optical signal outputted from said second port of said optical circulator into a plurality of split optical signals to output, and combines said plurality of split optical signals to create said wavelength multiplexing optical signal; a delay element which adds different delays for each adjacent channel of said plurality of said split optical signals wavelength-divided; and a reflector which reflects said split optical signals with each delay added in a state of orthogonalizing polarization states thereof and again enters said split optical signals to said delay element, wherein said split optical signals passing through said delay element, reflected by said reflector, are inputted as a multiplex input of said multi/demultiplexer, wherein said reflector comprises a Faraday mirror, wherein polarization states of said plurality of split optical signals are orthogonal to each other between adjacent channels, and wherein said multi/demultiplexer includes an interleaver for splitting said wavelength multiplexing optical signal between an odd number channel group and an even number channel group, and first and second multi/demultiplexers for splitting each of said odd number channel group and said even number channel group for each channel.