Abstract: A wavelength multiplexing optical communication device having an optical dispersion-compensating function compensating for waveform variation of an optical signal due to optical dispersion of a transmission line determines optimum dispersion-compensating values causing a minimum error rate with respect to pre-installed wavelength channels, produces a dispersion map of the transmission line based on optimum dispersion-compensating values, predicts an initial value of a dispersion-compensating value per a newly added wavelength channel with reference to the dispersion map, and starts scanning at the initial value so as to determine an optimum dispersion-compensating value of the newly added wavelength channel, thus updating the dispersion map by adding the optimum dispersion-compensating value of the newly added wavelength channel. Thus, it is possible to set an optimum dispersion-compensating value per each wavelength channel with a high precision, thus shortening the setting time.

Abstract: An optical signal receiver is provided which is capable of making an optical signal receiver come into common and shared use even when a plurality of transmission methods is to be performed and of constructing a simplified optical transmission system. In a performance monitoring circuit, a switching control section transmits a connecting control signal to make a switching section operate so that the switching section selects a monitoring section to be connected based on bit-rate information corresponding to information about a transmission method type fed from a frequency detecting circuit and the selected monitoring section is connected to a clock/data regenerating circuit. The monitoring section extracts alarm information from a data signal fed from the clock/data regenerating circuit and transfers the alarm information to the selection connecting section. When the switching control section receives alarm information, the alarm information is transferred to devices mounted on a downstream side.

Abstract: An optical signal receiver is provided which is capable of making an optical signal receiver come into common and shared use even when a plurality of transmission methods is to be performed and of constructing a simplified optical transmission system. In a performance monitoring circuit, a switching control section transmits a connecting control signal to make a switching section operate so that the switching section selects a monitoring section to be connected based on bit-rate information corresponding to information about a transmission method type fed from a frequency detecting circuit and the selected monitoring section is connected to a clock/data regenerating circuit. The monitoring section extracts alarm information from a data signal fed from the clock/data regenerating circuit and transfers the alarm information to the selection connecting section. When the switching control section receives alarm information, the alarm information is transferred to devices mounted on a downstream side.