| 摘要 |
PURPOSE: To suppress the effect due to 4-light wave mixture (FWM) crosstalk being a nonlinear energy drop in an optical fiber on the condition that each wavelength interval is equal by providing a wavelength converter and a synthesizer synthesizing signals of each wavelength outputted from the wavelength converter and providing an output. CONSTITUTION: The system is provided with a wavelength selection filter 1 branching an optical signal subjected to wavelength multiplex for each wavelength, a wavelength converter 2 setting a crosstalk light level to be a prescribed level or below through replacement of wavelengths by applying wavelength conversion to a signal of each wavelength branched by the filter 1 according to a control signal, and a synthesizer 3 synthesizing signals of each wavelength outputted from the wavelength converter 2 and providing an output. Then the wavelength filter 1 separates a signal light on which wavelengths λ1 , λ2 ,...λ3 , λ4 are multiplexed for each wavelength and gives the result to the converter Z. The converter Z rearranges the wavelengths λ1 and λ2 each other and sends them to the sythesizer 3. the synthesizer 3 synthesizes the wavelengths and provides an output, then FWM crosstalk amt. with a reference level or below is obtained from all channels. |
