弱风条件下斜程海洋湍流中涡旋光束的传输特性  

Propagation properties of the vortex beam in the slant path of ocean turbulence under weak wind model

作　　者：吴鹏飞[1,2] 李成毓 雷思琛 谭振坤 王姣 Wu Pengfei;Li Chengyu;Lei Sichen;Tan Zhenkun;Wang Jiao(School of Automation and Information Engineering,Xi'an University of Technology,Xi'an 710048,China;Xi'an Key Laboratory of Wireless Optical Communication and Network Research,Xi'an 710048,China;Faculty of Optoelectronic Engineering,Xi'an Technological University,Xi'an 710021,China;School of Electronic Information and Artificial Intelligence,Shaanxi University of Science and Technology,Xi'an 710021,China)

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048 [2]西安市无线光通信与网络研究重点实验室,陕西西安710048 [3]西安工业大学光电工程学院,陕西西安710021 [4]陕西科技大学电子信息与人工智能学院,陕西西安710021

出　　处：《红外与激光工程》2024年第2期148-158,共11页Infrared and Laser Engineering

基　　金：国家自然科学基金项目(62001363,62101313);陕西省教育厅服务地方专项计划项目(20JC027);陕西省科技厅重点研发计划-工业领域一般项目(2022GY-100);陕西省科协青年人才支持项目(20220142);陕西省科技成果转移与推广计划项目(2020CGXNG-041);西安市高校院所科技人员服务企业项目(22GXFW0074,22GXFW0004,22GXFW0050);碑林区2023年应用技术研发储备工程项目(GX2342)。

摘　　要：光束在海洋介质中传输会极大地受到海洋湍流的影响。此外,涡旋光束轨道角动量的复用会极大地提高系统容量,因此研究涡旋光束在海洋湍流中的传输具有重要意义。在水平海洋湍流理论基础上,创新性地构建了斜程路径上海洋湍流相位屏模型,以相位结构函数为依据验证了海洋湍流相位屏的准确性,根据多相位屏法搭建准直高斯涡旋光束在海洋湍流中的上行传输链路模型。数值模拟并分析了不同天顶角、海洋湍流内外尺度及拓扑荷数等其他海洋湍流参数对准直高斯涡旋光束经海洋湍流上行传输的光强及相位分布、光束漂移、轴上闪烁指数和长曝光光斑半径的影响。结果表明:涡旋光束的拓扑荷数越小、天顶角越小,光束受到湍流的影响越大;在海洋湍流上行传输链路中,准直高斯涡旋光束的光束漂移、轴上闪烁指数及长曝光光斑半径随海洋湍流外尺度的增大而增大,且主要受传输距离的影响;理想情况下,取海洋湍流外尺度为无穷大,会高估湍流对光束的影响;由于涡旋光束的本身特性,拓扑荷数对光强及相位分布和长曝光光斑半径的影响也较为显著。Objective In recent years,with the development of underwater laser communication,laser imaging,lidar and other technologies,many scholars have carried out extensive research on the propagation of beams in ocean turbulence.Beams propagation in ocean medium is greatly affected by ocean turbulence,and the orbital angular momentum multiplexing of the vortex beam greatly increases the system capacity,thus it is of great significance to investigate the propagation of the vortex beam in ocean turbulence.Most of the previous studies have focused on the propagation of beams through horizontal ocean turbulence.However,the beam is mostly propagated through ocean turbulence in the slant path in practical applications.Methods Based on the theory of horizontal ocean turbulence,the phase screen of ocean turbulence in the slant path is generated and compensated,the correctness of ocean turbulence phase screen in the slant path is demonstrated by phase structure function.The uplink propagation link model of collimated Gaussian vortex beam in ocean turbulence is built based on the multi-phase screen method.The intensity and phase profiles,beam wander,on-axis scintillation index and long-exposure beam radius of the collimated Gaussian vortex beam in the slant path of ocean turbulence for the values of the different zenith angle,the inner scale and the outer scale of oceanic turbulence,topological charge and other ocean turbulence parameters are numerically simulated and analyzed.Results and Discussions Two-dimensional diagram of random ocean turbulence phase screen(Fig.2(a)),and the correctness of ocean turbulence phase screen in slant path is demonstrated by phase structure function(Fig.2(b));The beam wander of collimated Gaussian vortex beam versus the propagation distance for the values of different tidal velocity of depth-averaged is simulated(Fig.6(b));The beam wander of the collimated Gaussian vortex beam versus the propagation distance for the values of different wind speed,the zenith angle and the outer scale of oceanic tur

关 键 词：海洋光学 斜程海洋湍流 相位屏 轴上闪烁指数 光束漂移 长曝光光斑半径 

分 类 号：O436[机械工程—光学工程]