According to the different transmission distances of optical modules, they can be divided into three types: short-distance optical module s, medium-distance optical modules, and long-distance optical modules. Optical modules are critical components in fiber optic communications, enabling the conversion between electrical and optical signals. Among them, long-distance optical modules refer to optical modules with a transmission. Some are responsible for connections of a few meters between server racks, while others bear the heavy responsibility of spanning tens of kilometers across a city.