Patent ID: 9287992
Filing Date: 2016-03-15
CPC Classification: H04B,H04J

Claim Text:
1. A wavelength division multiplexing transmission device in a wavelength division multiplexing transmission system which transmits signal light from a transmitting terminal station, the device comprising: an optical intensity detection unit configured to detect light intensity of signal light transmitted from the transmitting terminal station when an output of a transmitter added or reduced in the transmitting terminal station is turned ON and OFF; and a wavelength number detection unit configured to detect a number of wavelengths corresponding to a number of transmitters after being added or reduced, the wavelength number detection unit detecting the number of wavelengths based on an amount of fluctuation of the light intensity between a first light intensity of the signal light detected by the optical intensity detection unit when the output of the transmitter is turned ON and a second light intensity of the signal light detected by the optical intensity detection unit when the output of the transmitter is turned OFF.