The pigtail is also called pigtail. Only one end has a connector, while the other end is a broken end of an optical cable core, which is connected to other optical cable cores through welding. It often appears in the optical fiber terminal box to connect the optical cable and the optical fiber transceiver (coupler, jumper, etc. are also used between them).

Optical fiber connector is a detachable (movable) connection device between optical fiber and optical fiber. It is the basic requirement of optical fiber connector that the two end faces of optical fiber are precisely butted together to maximize the coupling of optical energy output by the transmitting optical fiber to the receiving optical fiber, and minimize the impact on the system due to its involvement in the optical link. To some extent, optical fiber connectors also affect the reliability and performance of optical transmission systems