海洋湍流中厄米-高斯光束的传输特性研究  

Transmission Characteristics of Hermite-Gaussian Beam in Oceanic Turbulence

作　　者：杜星 丁桂璇 杜浩 王生 冯慧 Du Xing;Ding Guixuan;Du Hao;Wang Sheng;Feng Hui(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 101408,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,北京101408 [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》2023年第24期31-38,共8页Acta Optica Sinica

基　　金：海南省自然科学基金(622MS105,620MS076)。

摘　　要：研究了海洋湍流中部分相干厄米-高斯光束的传输特性。首先,根据广义惠更斯-菲涅耳原理,建立了海洋湍流中厄米-高斯光束的强度分析模型。然后,推导了海洋湍流中厄米-高斯光束的均方束腰宽、瑞利区间和湍流距离的表达式。最后,对海洋湍流中厄米-高斯光束的均方束腰宽、瑞利区间和湍流距离进行仿真分析。仿真结果表明,均方束腰宽随着均方温度耗散率和温度与盐度相对参数的增大而增加,随着湍流动能耗散率的增大而减小。此外,瑞利区间和湍流距离都随着厄米-高斯光束的阶数的增加而增大。该研究可以为水下光通信研究提供理论依据。Objective In practical applications,communication between underwater platforms typically employs super low frequency/very low frequency(SLF/VLF)with narrow transmission bandwidths and insufficient security.Underwater laser communication has become a research hotspot due to its potential to provide higher transmission bandwidths and smaller transmission delay.However,adopting a Gaussian beam as a carrier of laser communication signals for underwater communication is limited by oceanic turbulence,which weakens the beam intensity and causes beam wander,beam expansion,and light intensity fluctuation to restrict the distance of underwater laser communication.To this end,we propose to utilize a Hermite-Gaussian beam for laser communication in oceanic turbulence.While this technique has been demonstrated in atmospheric turbulence,the mean square beam width,Rayleigh range,and turbulence distance in oceanic turbulence have not been reported.Therefore,our paper aims to build a beam transmission model in oceanic turbulence and analyze the mean square beam width,Rayleigh range,and turbulent distance.Finally,a more effective solution is provided for underwater laser communication technology,which can improve communication quality and extend the communication distance,thereby enabling more effective underwater exploration and resource development.Methods The research methodology involves the study on propagation properties of partially coherent Hermite-Gaussian beams in oceanic turbulence.Our study begins by developing an intensity analysis model of Hermite-Gaussian beams in oceanic turbulence based on the extended Huygens-Fresnel principle.Then,the mean square beam width,Rayleigh range,and turbulent distance of Hermite-Gaussian beams in oceanic turbulence are derived.The expressions are obtained by the analytical approach based on the proposed intensity analysis model.Finally,the simulation analysis of the mean square beam width,Rayleigh range,and turbulent distance of Hermite-Gaussian beams in oceanic turbulence is conducted

关 键 词：水下光通信 厄米-高斯光束 海洋湍流 传输特性 

分 类 号：O436[机械工程—光学工程]