水下无线光轨道角动量通信湍流斜射信道建模及其系统性能分析  

UWO-OAM Communication in Turbulence Slant Channel Modeling and Its System Performance Analysis

作　　者：赵阳 殷洪玺[1] 季秀阳 Zhao Yang;Yin Hongxi;Ji Xiuyang(School of Information and Communication Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学信息与通信工程学院,辽宁大连116024

出　　处：《光学学报》2024年第18期283-293,共11页Acta Optica Sinica

基　　金：国家自然科学基金(61871418)。

摘　　要：提出一种适用于水下涡旋光束湍流斜射光链路的信道模型,将海水的温度与盐度在深度上的分布情况与海洋湍流光信道相关联,基于多相位屏法搭建拉盖尔-高斯涡旋光束在海洋湍流中的斜射链路传播模型。数值仿真分析不同海水湍流参数、温度和盐度及链路倾斜角度等,对拉盖尔-高斯涡旋光束经海洋湍流斜射链路传输的闪烁指数和探测概率的影响。最后,基于全球海洋实时观测网Argo的真实数据,对湍流斜射链路的轨道角动量频移键控调制通信系统的性能进行数值分析,验证所提出的水下涡旋光束湍流斜射光链路信道模型的有效性。Objective In recent years,the growing demand for ocean exploration and exploitation has led to an increasing need for underwater high-rate,high-capacity,and low-latency communications.Orbital angular momentum(OAM),as a new multiplexing dimension,can provide additional multiplexing degrees of freedom that are structurally independent of amplitude,polarization,phase,and subcarriers.This is expected to substantially improve spectral efficiency and communication capacity,which makes it a recent hotspot in research for underwater wireless optical(UWO)communications.However,when the OAM beam propagates in an oceanic random turbulence channel,the seawater medium causes both absorption and scattering of the transmitted beam.Additionally,seawater turbulence,influenced by salinity and temperature fluctuations,disrupts the phase profile of the helical wavefront,which greatly affects the performance of the UWO-OAM communication system.In practical applications,the beam must carry information from the deep ocean to the shallow ocean,encountering vertical or slant optical links with seawater parameters that vary with water depth.Furthermore,there has been no research on the performance of the UWO-OAM communication system based on real ocean data.Therefore,it is of great significance to construct a more generalized ocean-inclined optical link.Methods Based on the power spectrum inversion method,a random phase screen of ocean turbulence related to seawater depth is generated and compensated for.The propagation channel model for vortex beams in an oceanic turbulent slant optical link is established using the multi-phase screen approach.Numerical simulations and analyses are conducted to study the effects of the scintillation index and detection probability of Laguerre-Gaussian(LG)vortex beams transmitted through slant oceanic turbulence channels across varying transmission distances,seawater turbulence parameters,average temperature and salinity,and link tilt angles.Finally,the performance of the OAM modulation communication syst

关 键 词：光通信 水下无线光通信 涡旋光束 轨道角动量 多层相位屏 斜射光信道 

分 类 号：TN929.1[电子电信—通信与信息系统] TN929.3[电子电信—信息与通信工程]