Wavelength cross connect device and cross connect connection method

A cross-connect connection method of a wavelength cross-connect device for performing relaying for changing, using WSSs, routes of optical signals transmitted from M routes, in which K optical fibers are grouped for each of the routes, on an input side to output the optical signals to respective optical fibers of M routes on an output side, the cross-connect connection method comprising steps, which are executed by the wavelength cross-connect device, of:

• detecting the number M of the routes on the input side and the number K of the optical fibers in each of the routes;
• detecting the number M of the routes on the output side and the number K of the optical fibers in each of the routes;
• detecting, based on the detected number K of the optical fibers on the input side, the number of first WSSs each including a 1 input port connected to each of the K optical fibers and M×L output ports, wherein L is a positive integer L K;
• detecting, based on the detected number K of the optical fibers on the output side, the number of second WSSs each including a 1 output port connected to each of the K optical fibers and M×L input ports;
• connecting the input port of each of the first WSSs to each of the optical fibers in each of the routes on the input side;
• connecting the output port of each of the second WSSs to each of the optical fibers in each of the routes on the output side;
• detecting the number of optical couplers each including K input ports connected to the output ports of the first WSSs on the input side and K output ports connected to the input ports of the second WSSs on the output side;
• connecting the K input ports of each of the optical couplers to the output ports of each of the first WSSs;
• and
• connecting the input ports of each of the optical couplers to output ports of the M×K first WSSs on the input side and connecting the output ports of each of the optical couplers to input ports of the second M×K WSSs on the output side such that the optical signals input from the K optical fibers in each of the routes on the input side are capable of being output to the K optical fibers in each of the routes on the output side, respectively,
• wherein each of the second WSSs includes 2×M×L demultiplexers configured to demultiplex and output optical signals output from each of the optical couplers, switches including ML input ports, to which the optical signals demultiplexed by each of the demultiplexers are input, and a 1 output port, and a multiplexer configured to multiplex the optical signals output from the switches and output the multiplexed optical signal to the optical fiber on the output side from a 1 output port.