FC is round and threaded, SC is buckle square, and LC is buckle square, which is smaller than SC. As for PC, APC and UPC, it mainly refers to the grinding method of ceramic ferrule in the joint. PC is polished by microspheres, APC is tilted at 8 degrees, and microspheres are polished.

Optical fiber connector (also called fiber jumping) refers to installing connector plugs at both ends of the lamp to realize the movable connection of optical paths; The transmitting and receiving wavelengths of the optical modules at both ends of the optical fiber jumper must be the same, that is, both ends of the optical fiber must be optical modules with the same wavelength.

The simple way to distinguish is that the colors of optical modules should be consistent. Generally speaking, short-wave optical modules use multimode fiber (orange fiber) and long-wave optical modules use single-mode fiber (yellow fiber) to ensure the accuracy of data transmission.