In the data center, optical modules exist everywhere, but few mention them. In fact, optical modules are already the most widely used products in the data center. Today's data centers are basically fiber-optic interconnections, and the number of cable interconnections has become less and less, so there is no optical module, and there is no way for the data center to operate. The optical module converts the electrical signal into an optical signal at the transmitting end through photoelectric conversion, and then transmits the optical signal into an electrical signal at the receiving end after being transmitted through the optical fiber, that is, any optical module has two parts for transmitting and receiving. Function, do photoelectric conversion and electro-optical conversion, so that the optical modules are inseparable from the devices at both ends of the network. There are thousands of devices in a medium-sized data center, and it takes at least thousands of optical modules to achieve full interconnection of these devices. Although the price of a single optical module is not high, it is very large. In this way, the overall cost of data center procurement optical modules is not low, and sometimes even exceeds the purchase amount of general network equipment, becoming a market segment in the data center.