基于costas光学锁相环的性能分析

摘要

光学锁相环是相干光通信系统的核心组成部分,可以有效地实现本振对信号光的相位跟踪和锁定,从而大大提高系统的接收灵敏度.本文基于二进制相移键控(BPSK)调制的科斯塔斯(costas)光学锁相环原理,通过软件仿真和计算得到了二阶环路下,带宽与自然频率的最佳关系以及维持系统稳定性的最优环路带宽,并在此基础上得到了相干系统各种参数的关系.%OPLL is the core component of the coherent optical communication system, it can effectively achieve phase tracking and locking between local oscillator and the received signal light, thus improve the system sensibility greatly. In this paper, on the basis of costas OPLL principle with BPSK modulation, we achieved the best relationship between bandwidth and natural frequency with the help of software simulation and computation, but also the optimum bandwidth that maintain the stability of the system under the second梠rder OPLL condition, based on this, we got the relationships of various parameters in coherent systems