锁相环技术的研究进展

Research progress of phase-locked loop technology

电锁相环(PLL)在无线通信系统、导航、雷达等领域中都占据相当重要的作用,它影响了整个系统的数据处理速率、时钟相位信息的提取等。光学锁相环(OPLL)具有高速实时接收、功耗低、抗背景光干扰能力强、抗多普勒频移等优势,是相干光通信系统的关键电路模块,其性能直接影响光通信系统性能,光锁相环的研究主要针对其参数进行优化和改进。综述了由电锁相环到光锁相环技术的研究进展,在对其原理和关键组件介绍的基础上,详细介绍了电锁相环和光锁相环的分类和参数指标,比较各类光锁相环的性能,总结了无线光相干通信系统中的光锁相环技术,最后对其未来的发展方向进行展望,可为锁相环技术在不同领域的研究和发展提供参考。

Phase-locked loop(PLL)plays an important role in wireless communication navigation,radar and other fields.It affects the data processing rate of the whole system and the extraction of clock phase information.The optical phase-locked loop(OPLL)has the advantages of high-speed real-time reception,low power consumption,strong ability to resist background light interference and Doppler frequency shift,and is the key circuit module of coherent optical communication system.Its performance directly affects the performance of optical communication system.The research of optical phase-locked loop is mainly aimed at optimizing and improving its parameters.This paper reviews the research progress of the technology from electric PLL to OPLL.Based on an introduction to the principle and key components,the classification and parameters of the electric PLL and optical PLL are introduced in detail,and the performance of various optical PLLs is compared.In addition,the OPLL technology applied in coherent optical wireless communication system is summarized,and the future development direction is prospected,which provides a benchmark for research and development of PLL technology in different areas.