Fiber optic switches play a very important role in optical network. It not only forms the switching core of key equipment in WDM network, but is also the key component in optical network. Featuring advantages such as high speed, high stability and low crosstalk, optical switches are a promising passive optical component and have become the research focus of major telecommunication companies and institutes. The application of optical switches is very wide, featuring various functions https://www.glsun.com/article-p97-the-applications-of-fiber-optical-switches.html