CABLE COUPLING, WAVELENGTH-MULTIPLEXED OPTICAL COMMUNICATION SYSTEM, AND WAVELENGTH-MULTIPLEXED-OPTICAL-SIGNAL BRANCHING METHOD

摘要

[Problem] To provide a cable coupling, a wavelength-multiplexed optical communication system, and a wavelength-multiplexed-optical-signal branching method with which only a signal that is permitted to be used at a branch station is branched at low cost. [Solution] Provided is a cable coupling that connects a branching device that branches a wavelength-multiplexed optical signal to a branch cable. The cable coupling includes: a band limiting means that limits the wavelengths of a signal dropped by the branching device to a first band when the signal is passed therethrough; a dummy-signal generating means that generates a dummy signal having wavelengths in a second band not including the first band; and a signal multiplexing means that multiplexes the signal passed through the band limiting means with the dummy signal and that forwards the resulting multiplexed signal to the branch cable.