Abstract:optical switchIt is the core device for all-optical switching in optical networks, and its research has increasingly become a focus of attention in the field of all-optical communication. The article focuses on the application of optical switches in all-optical networksMEMSoptical switchandThe basic working principle and two types of thermo optic switchesoptical switchThe progress of technology and a brief introduction to other optical switches were also presented.

Keywords: all-optical network;optical switchOptical CommunicationClassification number of the middle imageTN929.11 Literature Code: A

1 Preface

All optical network refers to the process where the up and down traffic signals and exchange are carried out in the form of light waves, without any photoelectric or electro-optical conversion, and all processes are completed within the optical domain [1,2].optical switchIt is a device that converts the optical signal of one optical channel to another optical channel according to certain requirements. Optical switches enable direct exchange between optical paths and are the core components for all-optical switching in optical networks. With the expansion of the all-optical network market, research on optical switches has increasingly become a focus of attention in the field of all-optical communication. In all-optical networks,optical switchIt can achieve important functions such as routing selection, wavelength selection, optical cross connection, and self-healing protection in the all-optical layer. Therefore, optical switches are key optical devices in many all-optical communication devices, and their response speed, crosstalk, insertion loss, and other performance will directly affect the quality of all-optical communication [3-6]. Among them, optical cross connect devices (OXC) and optical add/drop multiplexing devices (OADM) can be said to be the core of all-optical networks [7]. ButOptical switch and optical switch arrayIt is precisely the core technology of OXC and OADM. Developing all-optical cross connect OXC and add/drop multiplexing OADM devices has become an important part of building high-capacity communication backbone networks. Optical switches used in all-optical networks should have fast response speed, low insertion loss, low channel crosstalk, insensitivity to polarization, integrability and scalability, low cost, low power consumption, and good thermal stability [6-8].