基于光锁相环的大气湍流随机相位差解调系统仿真研究  

Simulation of atmospheric turbulence random phase difference demodulation system based on optical phase-locked loop

作　　者：刘乐嘉 南航[1] 张鹏[1] 王大帅 佟首峰[1] 高培钧 马晨源 LIU Lejia;NAN Hang;ZHANG Peng;WANG Dashuai;TONG Shoufeng;GAO Peijun;MA Chenyuan(Institute of Space Optoelectronics Technology,School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学光电工程学院空间光电技术研究所,长春130022

出　　处：《激光杂志》2025年第2期54-61,共8页Laser Journal

基　　金：国家自然科学基金(No.62231005);国家科技部重点研发项目(No.2022YFB2903401);国家科技部重点研发项目(No.2022YFB2903402);吉林省教育厅科学研究项目(No.JJKH20220746KJ)。

摘　　要：大气湍流是影响大气光通信性能的主要原因之一,传统测量法存在测量范围有限、易受环境影响等问题。基于零差相干光通信系统中光锁相环技术,通过对信道间大气湍流引入的随机相位解调,实现对信道内大气湍流强度的高精度、宽范围、高响应的实时测量。首先建立了测量系统理论模型,模拟了不同强度下大气湍流随机相位噪声模型;然后通过软件搭建了零差相干光通信仿真系统;最后导入湍流随机相位信息并进行通信和湍流测量,仿真结果验证了理论的可行性,湍流强度测量范围为10^(-18)m^(-2/3)~10^(-12)m^(-2/3),测量精度优于14.8%。本方法相比传统方法具有更宽的测量范围、更高的测量精度以及更灵活的测量距离的优势,对研究大气光通信系统信道间的大气湍流强度具有重要意义。Atmospheric turbulence is one of the important factors affecting the performance of atmospheric laser communication.Traditional measurement methods have the problems of limited measurement range and influence of en-vironment.Based on the optical phase-locked loop(OPLL)technology in homodyne coherent optical communication system,the atmospheric turbulence intensity is demodulated through the additional phase fluctuation information intro-duced by the atmospheric turbulence between channels.It can realize the real-time measurement of the atmospheric turbulence intensity in the communication channel with high precision,wide range and high response.Firstly,a theo-retical model of the measurement system is established,simulating random phase noise model of atmospheric turbu-lence under different intensities.Secondly,the homodyne coherent optical communication system is built through soft-ware.Finally,the turbulence random phase information is introduced into the simulation system.The simulation results verify the feasibility of the theory and shows that the measurement range of the atmospheric turbulence measurement system is 10^(-18)m^(-2/3)~10^(-12)m^(-2/3),and the measurement accuracy is better than 14.8%.The results show that this method has advantages of higher measuring accuracy,wider measuring range and more flexible measurement distance than the traditional measurement methods of atmospheric turbulence,and the results are of great significance for studying the intensity of atmospheric turbulence between channels in atmospheric optical communication system.

关 键 词：大气湍流 大气光学 光学锁相环 空间相干光通信 90°空间光混频器 

分 类 号：TN929.12[电子电信—通信与信息系统]