不稳定分层海洋湍流对厄米-高斯光通信系统的影响  

Effects of Unstable Stratified Ocean Turbulence on Hermite-Gaussian Optical Communication System

作　　者：丁桂璇 杜星 杜浩 王生 敖磊 李崔春 Ding Guixuan;Du Xing;Du Hao;Wang Sheng;Ao Lei;Li Cuichun(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Earth Observation of Hainan Province,Hainan Aerospace Information Research Institute,Wenchang 571300,Hainan,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100094 [2]中国科学院大学,北京100049 [3]海南空天信息研究院海南省地球观测重点实验室,海南文昌571300

出　　处：《光学学报》2024年第6期105-112,共8页Acta Optica Sinica

基　　金：国家重点研发计划(2022YFB3901805);海南省自然科学基金(622MS105)。

摘　　要：推导了不稳定分层海洋湍流下厄米-高斯光束闪烁指数的理论公式,以及考虑海洋湍流和瞄准误差综合影响下UWOC系统信道系数的概率分布函数,进一步推导了系统主要性能参数即误码率、信道容量和中断概率的理论计算公式,并采用高斯-厄米正交积分近似方法求得3个性能参数的闭合表达式,仿真分析了不稳定分层和稳定分层湍流情况下,光束模数、传输距离、海洋湍流参数和瞄准误差对系统的平均误码率、平均信道容量和中断概率的影响。结果表明:相比于稳定分层,不稳定分层的系统计算误差更小;当盐度波动占主导时,系统性能更好;随着均方温度耗散率增大、湍流动能耗散率减小、瞄准误差增大,系统信道容量减小,中断概率增大。本研究结果可为厄米-高斯光在水下光通信领域的应用提供参考。Objective Underwater wireless optical communication(UWOC)has caught much attention due to its wide frequency band,high information capacity,and fast data transmission rate.However,ocean turbulence causes light intensity scintillation during beam propagation,which increases the difficulty of optical signal resolution in UWOC systems.During establishing underwater optical communication links,Hermite-Gaussian(HG)beams can help to improve system performance by reducing scintillation.Most of the performance studies on current HG UWOC systems employ stable stratification turbulent power spectra,whose computational accuracy cannot match unstable stratification cases.Additionally,current research on UWOC is at the level where the system pointing error must be considered,but this aspect is not addressed in the study of the HG UWOC.According to the literature findings,the study of average bit error rate(BER),average channel capacity,and outage probability of UWOC systems based on unstable stratified ocean turbulence and HG beam pointing error is not reported.Therefore,we investigate the performance of the HG beam wireless optical communication system under unstable stratified ocean turbulence.Methods We derive the theoretical formulae for the HG optical scintillation index under unstable stratified ocean turbulence and the probability distribution function of the channel coefficients of UWOC systems considering the combined effects of ocean turbulence and pointing error.Meanwhile,theoretical formulae for the main performance parameters of the system are derived,including BER,channel capacity,and outage probability.Additionally,we derive the closed-form expressions for these three performance parameters using the Gaussian-Hermite orthogonal integral approximation method,thus conducting an in-depth analysis of the system performance.To more comprehensively evaluate the system performance in different conditions,we perform simulations to analyze the effects of beam modulus,transmission distance,ocean turbulence,and pointing e

关 键 词：海洋光学 厄米-高斯光束 不稳定分层 海洋湍流 水下光通信 

分 类 号：O436[机械工程—光学工程]