一种消除相位变化和调制深度的改进PGC解调技术  

An improved PGC demodulation technology for eliminating phase changes and modulation depth

作　　者：童晓凡 孔勇[1] 张贺 吴慧慧 廖后章 TONG Xiaofan;KONG Yong;ZHANG He;WU Huihui;LIAO Houzhang(Department of Control Science and Engineering,School of Electronic and Electrical Engineering,Shanghai University of Engineering and Technology,Shanghai 201620,China)

机构地区：[1]上海工程技术大学电子电气工程学院控制科学与工程系,上海201620

出　　处：《激光技术》2025年第1期41-47,共7页Laser Technology

基　　金：上海市自然科学基金资助项目(19ZR1421700)。

摘　　要：为了解决传统的相位生成载波解调技术中载波相位延迟、初始相位差和低频环境噪声等因素引起的相位变化以及相位调制深度引起的波形失真问题,提出了一种新的基于传统反正切解调的改进解调算法。该算法从理论上可同时消除载波相位延迟等不同因素引起的相位变化和调制深度依赖性的影响,无需额外的计算和补偿。结果表明,通过仿真软件和构建马赫-曾德尔干涉仪解调设备对所提出的改进算法与其它两种算法的波形和性能指标进行比较,新算法信噪比高达71.51 dB,总谐波失真率低至0.0004501%;改进算法对载波相位延迟、初始相位差和低频环境噪声等因素引起的相位变化和调制深度不敏感。该研究为提高相位产生载波解调技术的精度,提高系统性能提供了参考。In order to solve the phase change caused by factors such as carrier phase delay,initial phase difference,and low-frequency environmental noise in traditional phase generation carrier(PGC)demodulation technology,as well as waveform distortion caused by phase modulation depth,a new improved demodulation algorithm based on traditional arctangent demodulation was proposed.The phase changes and modulation depth dependence caused by different factors such as carrier phase delay could be theoretically eliminated by using this algorithm,without the need of additional calculations and compensation.By using simulation software and constructing a Mach-Zehnder interferometer demodulation device,the waveform and performance indicators of the proposed improved algorithm were compared with the other two algorithms.The results show that the calculated signal-to-noise ratio of the new algorithm is as high as 71.51 dB,and the total harmonic distortion rate is as low as 0.0004501%.The improved algorithm is insensitive to phase changes and modulation depth caused by factors such as carrier phase delay,initial phase difference,and low-frequency environmental noise.This study provides a reference for improving the accuracy of phase generation carrier demodulation technology and improving system performance.

关 键 词：光通信 解调失真 载波相位延迟 相位调制深度 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]