Patent ID: 7526204
Filing Date: 2009-04-28
Classification: H04B,H04J

Abstract:
1. An optical communication apparatus for adding and dropping an optical signal from a wavelength-division-multiplexed optical signal, comprising: a receiving dispersion compensating module for adjusting the accumulated dispersion of the wavelength-division-multiplexed signal such that the accumulated dispersion has an optimum value at a receiver for receiving optical signals in respective wavelength channels which are dropped from the wavelength-division-multiplexed optical signal; a demultiplexing unit for demultiplexing the wavelength-division-multiplexed optical signal whose accumulated dispersion has been adjusted by said receiving dispersion compensating module, into a wavelength-division-multiplexed optical signal in a through wavelength group to pass though the optical communication apparatus and a wavelength-division-multiplexed optical signal in a dropped wavelength group to be dropped from the optical communication apparatus; an auxiliary dispersion compensating module for applying the same value of dispersion as the value of accumulated dispersion adjusted by said receiving dispersion compensating module, to a wavelength-division-multiplexed optical signal in an added wavelength group representative of signals to be added; and a multiplexing unit for combining the wavelength-division-multiplexed optical signal in the through wavelength group and the wavelength-division-multiplexed optical signal in the added wavelength group whose accumulated dispersion has been adjusted by said auxiliary dispersion compensating module, into an output optical signal.