OPTICAL SIGNAL DEMULTIPLEXING DEVICE, OPTICAL SIGNAL RECEPTION DEVICE, OPTICAL SIGNAL TRANSMITTING/RECEIVING DEVICE, AND OPTICAL SIGNAL DEMULTIPLEXING METHOD

摘要

The present discloses demultiplexes optical signals whose wavelength intervals are different from one another while reducing the number of ports of a wavelength selective switch to be used. Branch means (11) branches an optical signal by the number of wavelength intervals. Each band division means (12) generates a band division signal in which a signal band is divided into N division bands and an odd channel and an even channel are separated from each other. Multiplexing means (13a and 13b) multiplex band division signals of the same signal band, and branch means (14a and 14b) output the multiplexed signal to an optical receiver (20). Control means (15) controls the wavelength selective switch included in the band division means (12) based on information indicating a signal arrangement of the signals in the respective wavelength intervals, thereby causing a signal of a signal band in which a signal of a corresponding wavelength interval is present to be included in each band division signal.