SFP optical module is a hot-swappable small package module in SFP package, suitable for gigabit switches with SFP ports, and can be used to extend the data transmission of the entire network through single-mode and multi-mode fibers. SFP classification can be classified by speed, wavelength, and mode. At present, the maximum rate of SFP optical modules can reach 10.3G, and the LC interface.

　　SFP optical module is mainly composed of laser (including transmitter TOSA and receiver ROSA), circuit board IC and external accessories. The external accessories include PCBA, pull ring, shell, base, sheet metal and rubber plug. Color to distinguish the wavelength of the module. SFP optical modules are widely used in data centers, mobile communication base stations, passive wavelength division systems, SAN/NAS storage, 5G bearer network and other fields. Many consumers will have such questions as to why the application range of SFP optical modules With such a wide range, what are the advantages of SFP optical modules?

　　SFP optical modules have the following five advantages

　　1. Support hot swap

　　The SFP optical module adopts the pin definition of gold fingers, which makes the power-on sequence of different functional pins of the module different, which ensures that the SFP module can be hot-swapped when the socket is powered on, which facilitates the maintenance of the system chassis. .

　　2. With digital diagnostic function (DDM)

　　It can monitor and report some relevant working parameters of the module in real time, and can monitor its working status.

　　3. Low cost

　　The integration of optical transceivers not only saves raw materials, but also saves man-hours compared with the previous separate optical receiving and optical transmitting modules. Therefore, the optical transceiver module is the best solution to realize low-cost bidirectional transmission and optical interconnection.

　　4. Miniaturization

　　The size of the SFP module is not only smaller than that of a single optical transmitter module or optical receiver module, but also due to the coaxial optical device in the LC type package, its size is smaller than that of other packaged optical transceiver modules. The installation can also be more intensive. Integrated circuits are used in the components to complete the functions of APC (power compensation), ATC (temperature compensation), driving, and slow-start protection of the transmitting module, as well as the functions of pre-amplification, limit amplification, and signal alarm of the receiving module.

　　5. High reliability

　　The IC is used in the component and isolated to ensure the reliability of the circuit. At the same time, the coaxial packaging of the To tube shell is adopted to ensure the service life of the photoelectric device die. In the production process, the laser welding process is adopted to improve the reliability. The transmitting and receiving parts inside the module are completely independent, which reduces the cross-winding between the two, so that the interference of the module itself is reduced and the performance is better.