Optical network system and WDM apparatus

摘要

An optical network system that performs transmission of N:1 protection includes a node (101) that includes transmission-side operating muxponders (3-1 to 3-N) that multiplex client signals for every M-channel signal bundle and convert multiplexed signals into optical signals having different wavelengths, transmission-side optical couplers (2-1 to 2-4N) that branch the client signals into two channels of operating and redundant, transmission-side optical switches (5-1 to 5-N) each selecting one channel from redundant signals as a redundant client signal, and a transmission-side redundant muxponder (6) that performs a predetermined transmission-side process according to an accommodation mode set on the redundant client signal and then multiplexes the redundant client signals, converts the multiplexed signal into an optical signal having a wavelength different from that of the operating signal, thereby making the accommodation mode settable for each channel in an independent manner.