阵列涡旋光束在不稳定分层海洋中的远距离传输  

Long-Distance Transmission of Vortex Beam Arrays in Unstable StratifiedOcean

作　　者：王明军[1] 张妍 Wang Mingjun;Zhang Yan(School of Automation and Information Engineering,Xi an University of Technology,Xi an 710048,Shaanxi,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

出　　处：《中国激光》2024年第8期146-155,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金重大研究计划培育项目(92052106);国家自然科学基金(61771385,62101313);陕西省杰出青年科学基金(2020JC-42);固体激光技术重点实验室开放基金(6142404190301);西安市高校人才服务企业工程项目(GXYD14.26);陕西省高等学校创新团队项目、西安市重点产业链关键核心技术攻关项目(103-433023062);咸阳市重点研发计划(L2023-ZDYF-QY⁃CX-025);河南省可见光通信重点实验室基金(HKLVLC2023-B05)。

摘　　要：阵列光束在大功率激光合成、远距离通信、高质量输出等方面发挥着重要作用。本文利用相位屏法模拟海洋湍流,研究了径向阵列涡旋光束与矩形阵列涡旋光束在具有外尺度的不稳定分层海洋中的传输特性,并将其与单涡旋光束的传输特性进行了对比,分析了三种涡旋光束在海洋湍流中的光强与相位分布。结果表明:两种阵列涡旋光束传输一段距离后不再保持初始的阵列分布,子光束之间会相互影响,产生了干涉条纹。在相同的条件下,单涡旋光束的漂移比两种阵列涡旋光束大,束宽比两种阵列涡旋光束小,而且径向阵列涡旋光束的漂移比矩形阵列涡旋光束大,束宽比矩形阵列涡旋光束小。在较远距离处,单涡旋光束的闪烁指数比两种阵列涡旋光束大,而且矩形阵列涡旋光束的闪烁指数比径向阵列涡旋光束大;在较强湍流和远距离处,三种涡旋光束的束宽逐渐减小。Objective The ocean is an important part of the Earth,covering 70%of the Earth s surface.Therefore,marine optical communication is an important field for researchers in optical communication technology.Vortex beams,which carry orbital angular momentum(OAM),can be considered as a new degree of freedom.By leveraging the orthogonal and infinite properties of the OAM mode,these beams can enhance the capacity and spectral efficiency of communication systems.Additionally,the array beam is composed of several single beams with different arrangement modes.Previous studies have shown that the array beam not only improves the transmission power but also suppresses the influence of turbulence on beam transmission.Therefore,researchers developed linear,rectangular,and radially distributed laser arrays.Current research mainly focuses on array beam transmission in the atmosphere,and there is a paucity of studies on transmission characteristics in the ocean.However,these methods are based on Nikishov stable stratified sea spectra with an infinite outer scale,and there have been few studies on the drift characteristics and beam propagation of array vortex beams.Therefore,this study aims to investigate the transmission characteristics of single vortex beams,radial array vortex beams,and rectangular array vortex beams in an unstable stratified ocean considering external scales and analyze the influence of distance on their light intensity and phase.The results of this study provide a theoretical foundation for the development of underwater optical communication technologies.Methods In marine media,refractive index fluctuations are controlled by temperature and salinity fluctuations.In this study,the low-frequency components were superimposed on a phase screen simulated using the power spectrum inversion method to compensate for the absence of low-frequency components.The field phase in the beam propagation path changes after the beam passes through multiple random phase screens.The process of a beam passing through multiple random

关 键 词：光通信 阵列涡旋光束 闪烁指数 湍流相位屏 海洋湍流 光束漂移 

分 类 号：TN929.1[电子电信—通信与信息系统]