The solid-state LiDAR with FMCW+OPA+coherent detection will become an important direction in the development of LiDAR. FMCW LiDAR has obvious advantages over traditional TOF LiDAR technology in terms of personnel safety, anti-interference ability, longer detection distance, and has the ability to detect instantaneous velocity information. The high-power narrow linewidth frequency modulation laser is the most core component in OPA+FMCW lidar. Currently, the frequency modulation laser with micro source photons has become the preferred laser for many domestic lidar companies, and the product has received praise from domestic and foreign customers.