Connet provides extremely rich single-frequency fiber lasers and single-frequency fiber amplifier products for coherent LiDAR, such as continuous or pulsed Coherent Doppler wind measurement LiDAR, coherent imaging LiDAR, linear frequency modulation continuous wave (LFMCW LiDAR ). The conventional lasers used for coherent LiDAR are CO2 lasers, solid-state lasers such as Nd: YAG lasers, semiconductor lasers, etc. Connet uses ultra-narrow linewidth and low noise single-frequency fiber lasers such as CoSF-D or CoSF-R as the seed laser of coherent LiDAR, which has obvious advantages compared with semiconductor lasers. The extremely low phase noise and frequency noise are s inherent characteristics of the single-frequency fiber laser itself. This will bring benefits to the signal-to-noise ratio of the coherent LiDAR system. In order to improve the relative intensity noise (RIN) performance of single-frequency fiber lasers, Connet uses a unique extra-cavity RIN suppression technology that does not affect the phase noise and frequency noise of single-frequency fiber lasers.