With the development of the information age technology and the change of the system requirements, continuously expand communication network information transmission capacity, and the rate of optical fiber communication network constantly improve, in optical communication products, optical module occupies an important position, in the present optical communication products, the SFP optical module is more and more get the needs of people and favor.

　　SFP optical module can also be understood as an upgraded version of the GBIC module, the volume of the SFP optical module GBIC module than half of small volume, but also has to be hot-swappable features, namely the need to cut off the power supply, module can and equipment connection or interruption, convenient replacement, but also has low cost, low power consumption, long distance, high speed and so on.

　　Some people call SFP optical module as mini-GBIC. The function of SFP optical module is basically the same as that of GBIC module. At present, the highest speed of SFP optical module can reach 10G. In order to identify the convenience, generally with the color of the ring to identify the type of module. SFP optical module is the most widely used optical module.

　　According to the rate of 155 m / 622 m / 1.25 G / 2.125 G / 4.25 G / 8 G / 10 G, 1.25 G and 155 m in the market with more, 10 G technology has also been gradually mature, demand is to increase the attitude of the development, is the future main SFP optical module products.