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中文摘要：
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。
英文摘要：
The optical phase locked loop（OPLL）is obtained from the electronics phase locked loop,which also affects the optics with its developing. The OPLL is based on photoelectric detectors,phase discriminator and matched electric circuits.The current module and piezoelectric ceramics scaling module of the semiconductor laser to be locked are controlled by the feedback loop.By this way,the frequency and phase of two lasers could be locked by the OPLL.The structure of the OPLL and the operating principle of phase frequency detector（PFD）were introduced in this paper.A new OPLL circuits was designed based on the phase locked loop chip ADF41020,and the designed frequency difference range of two lasers to be locked was 4GHz-18 GHz.
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