Optical signal demultiplexing device, optical signal receiving device, optical signal transmitting and receiving device, and optical signal demultiplexing method

摘要

An optical signal having a different wavelength interval is demultiplexed while suppressing the number of ports of a wavelength selective switch used. The branching means (11) branches the optical signal by the number of wavelength intervals. Each band division unit (12) generates a band division signal in which a signal band is divided into N division bands and odd channels and even channels are separated. The multiplexing means (13a and 13b) multiplex the band-divided signals of the same signal band, and the branching means (14a and 14b) output the multiplexed signal to the optical receiver (20). The control means (15) controls the wavelength selection switch included in the band division means (12) based on the information indicating the signal arrangement of the signal at each wavelength interval, so that the signal band in which the signal at the corresponding wavelength interval exists. Is included in each band division signal.