The optical module (optical module) is composed of optoelectronic devices, functional circuits and optical interfaces. The optoelectronic device includes two parts: transmitting and receiving. The SFP produced by Shenzhen Xianyitong Technology Co., Ltd. is a small, hot-swappable optical module, which can be simply understood as an upgraded version of GBIC. The volume of the SFP module is half that of the GBIC module, and it is only the size of a thumb. More than double the number of ports can be configured on the same panel. The other functions of the SFP module are basically the same as those of the GBIC, and the SFP module is also called a miniaturized GBIC. Optical modules are classified according to the packaging form and speed. The common ones are SFP, 1X9, SFP+, XFP, QSFP, CFP, GBIC, CXP, CFP2, CFP4, CWDM and DWDM series and so on. Shenzhen Xianyitong Technology Co., Ltd. produces a complete range of optical modules with high stability and strong compatibility.