The International Telecommunication Union (ITU) proposes to define the optical fiber movable connector as "a passive component used to connect two or more optical fibers stably, but not permanently" (adopted by Research Group VI of CCITT in Geneva in March 1992). It is a device for detachable (movable) connection between optical fiber and optical fiber. It is a precise butt joint of two end faces of optical fiber, so that the optical energy output by the transmitting optical fiber can be coupled to the receiving optical fiber to the maximum extent, and the impact on the system caused by its intervention in the optical link is minimized.
According to the different transmission media, the optical fiber movable connector can be divided into common single-mode and multi-mode connectors of silicon-based optical fiber, and other optical fiber connectors with plastic as the transmission media. According to the connector structure, it can be divided into FC, SC, St, LC, MTRJ, MPO, mu, SMA, FDDI, E2000, din4, D4 and other forms