Wavelength selective switch based on lcos

A wavelength selective switch (WSS), comprising:

• an optical fiber array;
• and
• a liquid crystal on silicon (LCoS) panel, wherein
• the optical fiber array comprises a plurality of ports, the plurality of ports comprise one input port and a plurality of output ports, the input port is configured to receive a light beam, the light beam is diffracted to the output ports through the LCoS panel, all diffraction orders that are generated after the diffraction are on a straight line, and the plurality of output ports are configured to obtain an order with strongest energy in all the diffraction orders, and
• the plurality of output ports are arranged into one layer or a plurality of layers, and at least one layer of output ports in the one layer or the plurality of layers of output ports are arranged in the following manner:
• centers of the plurality of output ports are distributed along a combination line, wherein the combination line comprises a line segment, a straight line connecting centers of any two output ports on the combination line does not pass through the input port, only one intersection point exists between the straight line that all the diffraction orders pass through and the combination line, a diffraction order at the intersection point is the order with strongest energy in all the diffraction orders, and one output port is arranged at the intersection point.