Optical communication network system

An optical communication network system, comprising:

• a wavelength selective switch (WSS) that includes a first input port, a second input port, a first output port, and a second output port, and is capable of selecting an output port for each wavelength component of a signal input from the input port;
• a first multiplexing network comprising S1 (S1 is an integer of 2 or more) input ports and at least one output port, the first multiplexing network including an optical transmission configuration in which a plurality of couplers are connected in a tree shape, the first multiplexing network being connected to the first input port of the WSS;
• a second multiplexing network comprising S2 (S2 is an integer of 2 or more) input ports and at least one output port, the second multiplexing network including an optical transmission configuration in which a plurality of couplers are connected in a tree shape, the second multiplexing network being connected to the second input port of the WSS;
• a first demultiplexing network comprising at least one input port and T1 (T1 is an integer of 2 or more) output ports, the first demultiplexing network including an optical transmission configuration in which a plurality of couplers are connected in a tree shape, the first demultiplexing network being connected to the first output port of the WSS;
• and
• a second demultiplexing network comprising at least one input port and T2 (T2 is an integer of 2 or more) output ports, the second demultiplexing network including an optical transmission configuration in which a plurality of couplers are connected in a tree shape, the second demultiplexing network being connected to the second output port of the WSS.