在激光通信、量子光学等领域,获得低相位噪声的相干激光是实现高信噪比信号探测的前提,光学锁相环是获得相干光的有效方式,环路的相位噪声水平直接制约着相干光相位噪声水平。为了降低相干激光相位噪声,从光学锁相环环路的基本模型出发,推导了锁相环的传递函数以及环路方程,分析了锁相环路不同频段的相位噪声来源和其对环路噪声的影响,最后通过激光锁相实验对前面的理论分析进行了简单的验证和分析。对低相噪锁相环路设计具有指导意义。 In the fields of laser communication and quantum optics, coherent laser with low phase noise is the premise of high signal-to-noise ratio detection. Optical phase-locked loop is an effective way to obtain coherent light. The phase noise level of the loop directly restricts coherent light Phase noise level. In order to reduce the coherent laser phase noise, based on the basic model of the optical phase-locked loop, the transfer function of the phase-locked loop and the loop equation are deduced. The sources of phase noise in different frequency bands and their effects on the loop noise Finally, the previous theoretical analysis was verified and analyzed by laser phase-locking experiment. Low phase noise phase-locked loop design is instructive.