大气湍流对基于轨道角动量的自由空间光通信影响及解决方案综述

Influence of Atmospheric Turbulence on Free Space Optical Communication Based on Orbital Angular Momentum and Solutions:A Review

摘要:

基于轨道角动量(OAM)的自由空间光通信(FSOC)具有通信容量大、信息传输快等优点。FSOC系统以大气作为传输媒介,受大气吸收、散射等影响,OAM光束传输质量严重下降。从OAM复用技术和大气湍流模型出发,综述了大气湍流强度对OAM空间光通信系统传输误码率和信道容量影响的研究现状,在此基础上综述多入多出均衡技术及自适应光学技术研究现状,并分析比较了两种技术中不同算法对大气湍流影响的抑制效果,对技术发展现状进行了展望。

Abstract:

Free space optical communication (FSOC) based on orbital angular momentum (OAM) has the advantages of large communication capacity and fast information transmission. The FSOC system uses the atmosphere as the transmission medium, which will be affected by atmospheric absorption and scattering. As a result, the transmission quality of the OAM beam is seriously degraded. Based on the theory of OAM multiplexing technology and atmospheric turbulence model, this paper analyzed the influence of different turbulence intensities on the bit error rate and channel capacity of OAM beam transmission, and analyzed the research status of the mitigation effect on atmospheric turbulence by introducing multiple-input multiple-output equalization technology and adaptive optics technology respectively into FSOC system. The inhibition effects of different algorithms in the two technologies were compared and analyzed, and the technology development status was summarized and prospected.