光学锁相环(OPLL)是电子学锁相环在光学领域的拓展,它是基于光电探测器、鉴相器以及配套的电路,通过反馈回路控制半导体激光器的电流模块和压电陶瓷扫描模块,以达到锁定两束激光的频率和相位的目的。介绍了光学锁相环的结构、鉴频鉴相器(PFD)的工作原理,并基于锁相环路芯片ADF41020设计了一种光学锁相电路,设计锁定两束激光的频率差的范围为4GHz-18GHz。 Optical phase-locked loop (OPLL) is an electronic phase-locked loop in the field of optical development, which is based on the photodetector, phase detector and the matching circuit, the feedback loop control of the semiconductor laser current module and the piezoelectric ceramic scanning module, In order to achieve the purpose of locking the frequency and phase of two laser beams. The structure of the optical phase-locked loop and the working principle of the phase-frequency detector (PFD) are introduced. An optical phase-locked circuit is designed based on the phase-locked loop chip ADF41020. The designed range of the frequency difference between the two laser beams is 4GHz -18GHz.