LCOS can be applied to wavelength selective switches WSS for optical communication, which are the core components of optical cross connectors OXC and ROADM. Its port structure is N × K (N in K out), using an optical switch array to achieve the function of outputting any set of wavelengths from the input port to any port, thereby achieving high-speed optical crossover. It is an important core component of current optical communication networks, gradually sinking from backbone networks and metropolitan area networks to local area networks.