Optical fiber connector：
FC round type thread (the most used on the rack)
ST card connected circular
SC card connected type (the most used on router switch)
PC microsphere lapping and polishing
APC is 8 degree angle and microsphere lapping polishing
MT-RJ type, one double fiber transceiver (HUAWEI 8850)
In marking the tails, we often see "FC/PC", "SC/PC" and so on. The meaning is as follows: the front part indicates that the "SC" connector of the tail fiber connector is the standard square joint, and the engineering plastic has the advantages of high temperature resistance and no easy oxidation. The side connector of the transmission equipment is generally similar to the SC connector "LC" joint and the SC joint shape, smaller than the SC joint. The "FC" connector is a metal joint, generally used on the ODF side. The metal joint can be plugged more times than plastic. There are many kinds of connectors, besides MTRJ, ST, MU and so on, which are the three introduced above. "/" indicates the section technology of the optical fiber joint, that is, the way of grinding. "PC" is the most widely used device in telecom operators, and its joint section is flat. "SC" indicates that the type of tail fiber connector is SC joint. The side connector of the industry transmission equipment is usually connected with SC connector. The SC joint is engineering plastic, which has the advantages of high temperature resistance and not easy oxidation. The ODF side light interface is usually made of FC joints, FC is metal joint, but ODF will not have high temperature problems. At the same time, the metal joint can be plugged more times than plastic. More pigtail. Other common connectors are ST, DIN and FDDI. "PC" indicates the section technology of optical fiber joints, and PC is the most common. The APC model is widely used in broadcasting and early CATV. The tail end of the pigtail head has a tilt angle. The slope can not be seen normally, and the quality of the TV signal can be improved. The main reason is that the TV signal is modulated by analog light. When the coupling plane of the joint is vertical, the reflected light returns along the original path. The uneven distribution of fiber refractive index will return to the coupling surface again. Although the energy is very small, because the analog signal can not eliminate the noise completely, it is equivalent to adding a weak signal with time delay on the original clear signal. On the screen is the ghost. The inclination angle of the tail fiber can make the reflected light not return along the original path. General digital signals generally do not have this problem. There is also a kind of "UPC" process, its decay is smaller than PC, and the enamel tray usually has special needs, its enamel plate is generally FC/UPC. The ODF jumper for foreign manufacturers is FC/UPC, which improves the index of ODF equipment itself.
