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Optical fiber connector is a detachable (movable) connection device between optical fibers, which precisely connects the two end faces of optical fibers, so that the optical energy output from the transmitting optical fiber can be coupled into the receiving optical fiber to the maximum extent, and the influence on the system caused by its involvement in the optical link can be minimized, which is the basic requirement of optical fiber connector. To some extent, optical fiber connectors affect the reliability and performance of optical transmission systems. According to different transmission media, optical fiber connectors can be divided into common single-mode and multi-mode connectors of silicon-based optical fibers, as well as other optical fiber connectors with plastic as transmission media; According to the connector structure, it can be divided into FC, SC, ST, LC, D4, DIN, MU, MT and so on. Among them, ST connectors are usually used for wiring equipment, such as optical fiber distribution frames and optical fiber modules; SC and MT connectors are usually used on the network equipment side. According to the shape of fiber end face, there are FC, PC (including SPC or UPC) and APC. According to the number of optical fiber cores, there are single-core and multi-core (such as MT-RJ). Optical fiber connectors are widely used and varied. In the practical application process, we generally distinguish them according to the different structures of optical fiber connectors. It is divided into FC-type optical fiber connector, SC-type optical fiber connector, biconical connector, MT-RJ connector, LC connector, MU connector and MC connector.