The optical module is an optical device used for photoelectric conversion and electro-optical conversion, which consists of optoelectronic devices, functional circuits and optical interfaces. The optoelectronic device includes two parts: transmitting and receiving. The transmitting end converts the electrical signal into an optical signal, and after transmission through the optical fiber, the receiving end converts the optical signal into an electrical signal, so the optical module is also called an integrated optical transceiver module. As long as there are optical fibers, there will be optical modules. Specific equipment: optical transceivers, optical transceivers, switches, optical network cards, optical high-speed domes, base stations, repeaters, etc. SFP is often used for rates below 4G. XPK is often used for 10 Gigabit rates.

　　1. Classification by speed

　　In order to meet the requirements of various transmission rates, optical modules with different rates are produced: FE optical modules, GE optical modules, 10GE optical modules, and 40GE optical modules.

　　Second, according to packaging classification

　　Optical modules with higher transmission rates have more complex structures. In order to meet the needs of different structures, optical modules of various packaging types are produced. The package types applicable to Huawei switches are: SFP package, SFP+ package, XFP package, and QSFP+ package.

　　3. Classification according to physical layer standards

　　In order to satisfy the data transmission in different forms, various physical layer standards are defined, and optical modules supporting various standards are produced. The detailed categories are shown in the "standard type" in the following table.

　　4. Classification by mode

　　Fiber is divided into single-mode fiber and multi-mode fiber. In order to satisfy the use of different types of optical fibers, single-mode optical modules and multi-mode optical modules are produced.