Optical network system and wdm apparatus

An optical network system that performs transmission of N:1 protection with respect to client signals of M×N channels constituting a signal bundle with M channels, where M is an integer equal to or larger than 2 and N is an integer equal to or larger than 1, wherein

• the client signal includes a plurality of types of signals, and
• the optical network system comprises:
• a transmission-side optical redundant switching device including
• a transmission-side operating muxponder that generates a multiplexed signal for each of the signal bundles by performing a multiplexing process including a predetermined transmission-side process according to a type of the client signal on the client signals, and converts each multiplexed signal into an operating optical signal having a different wavelength,
• a transmission-side optical coupler that branches the client signal into an operating signal and a redundant signal for each channel of the client signals,
• M parallel transmission-side optical switches each selecting one channel from among the redundant signals of the N signal bundles, and outputs a selected redundant signal as a redundant client signal, and
• a transmission-side redundant muxponder that generates a multiplexed signal by performing a multiplexing process including a predetermined transmission-side process according to a type of the signal on the M-channel redundant client signals, converts the multiplexed signal into a redundant optical signal having a wavelength different from that of the operating optical signal, and performs a process according to the type by setting an accommodation mode corresponding to the type in the predetermined transmission-side process, thereby making the accommodation mode settable for each channel in an independent manner;
• and
• a reception-side optical redundant switching device including
• a first WDM device that multiplexes the operating optical signal and the redundant optical signal by a wavelength, and outputs a wavelength-multiplexed signal to an optical transmission path,
• a second WDM device that demultiplexes a wavelength-multiplexed signal input from the optical transmission path, and outputs wavelength-demultiplxed signals,
• a reception-side operating muxponder that generates an output client signal by performing a demultiplexing process including a predetermined reception-side process according to a type of the client signal on the operating optical signal from among the wavelength-demultiplexed signals,
• a reception-side redundant muxponder that generates an output client signal by performing a demultiplexing process including a predetermined reception-side process according to a type of the client signal on the redundant signal from among the wavelength-demultiplexed signals, and performs a process according to the type by setting an accommodation mode corresponding to the type in the predetermined reception-side process, thereby making the accommodation mode settable for each channel in an independent manner,
• a reception-side optical coupler that is provided for each channel of the client signals and optically couples an output client signal generated by the reception-side redundant muxponder and an output client signal generated by the reception-side operating muxponder, and
• a reception-side optical switch that selects a reception-side optical coupler corresponding to a channel selected by the transmission-side optical switch as an output destination of an output client signal generated by the reception-side redundant muxponder, and outputs an output client signal generated by the reception-side redundant muxponder to a selected reception-side optical coupler.