In addition to requiring the output optical power of the laser to remain stable within the full temperature range, the emission part of the SFP+ optical module also requires the extinction ratio of the optical signal emitted by the laser to be basically stable. The transmitting part of the high-speed SFP+ optical module not only requires the output optical power of the laser to remain stable in the full temperature range, but also requires the extinction ratio of the optical signal emitted by the laser to remain basically stable. Keeping the output optical power stable in the full temperature range is the transmitting part of the high-speed SFP+ optical module. The design temperature of the SFP+ module based on the plastic-encapsulated 10G850nm VCSEL is -40℃-85℃. In the absence of an automatic temperature control circuit, the laser temperature characteristics The resulting changes in the performance index parameters of the optical module may exceed the allowable range of the system design, resulting in abnormal communication signals. Therefore, when designing the module circuit, a temperature control system must be used to monitor and compensate it in real time to ensure the stability of the extinction ratio and luminous power of the optical module, and to ensure the normal operation of the optical communication system.