With the rapid development of the network, GBIC(Gigabit Interface Converter) is gradually replaced by SFP optical transceiver. The SFP optical module transceiver inherits the hot-swap characteristics of GBIC and also borrows the advantages of SFF miniaturization. The use of LC connector has greatly increased the port density of network equipment, adapted to the rapid development of the network, and has been used in the most widespread applications. Although many higher-tech and newer optical module products have appeared, SFP optical modules will continue to exist for a long time. After SFP, the development of optical module transceivers are mainly toward higher speeds. 10G, 40G, 100G and other optical modules have appeared.