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High performance optical add/drop multiplexer and optical wavelength multiplexing network
High performance optical add/drop multiplexer and optical wavelength multiplexing network
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机译:高性能光分插复用器和光波长复用网络
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摘要
In making use of an add/drop multiplexer for demultiplexing or multiplexing signal light of a few specific wavelengths from signal light subjected to optical wavelength multiplexing, a fiber bragg grating (33-1,33-N) is excellent for enhancing rejection of a leakage of a demultiplexed light, but with respect to a high speed optical signal at the demultiplexing or multiplexing, a waveform deterioration occurs. When a dielectric multilayer film filter is used for dealing with the high speed optical signal, a plurality of filters are used to suppress a coherent cross talk, resulting in an increase of loss of pass-through light and an increase of costs.;For a filter portion of at least demultiplexing part (22-1), a dielectric multilayer film filter (23-1,23-N) which is short in an optical path and free from deterioration of a high speed optical signal is used, and for demultiplexed light leakage rejecting part between the demultiplexing part and the multiplexing part, a fiber bragg grating (33-1,33-N) which is low in loss of pass-through light, is low in cost and is excellent in the rejection characteristics of filter light is used.
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