With the rapid development of optical fiber technology and the large-scale application of dense wavelength division multiplexing (DWDM) systems, optical switches have become a key link in future optical interconnection. It is a device with one or more selectable transmission ports that can perform mutual conversion or logical operations on optical signals in optical transmission lines.

Optical on-off switches, simply referred to as optical switches, are devices used in optical communication systems to selectively route optical signals from one fiber or port to another.

Optical Switch (OS) is mainly used to realize physical switching or other logical operations of Optical signals in optical paths, and is often used as a key component of optical path switching in optical Cross-connect technology.