自由空间轨道角动量新型光通信关键技术研究

项目名称： 自由空间轨道角动量新型光通信关键技术研究

项目编号： No.61475075

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 无线电电子学、电信技术

项目作者： 赵生妹

作者单位： 南京邮电大学

项目金额： 82万元

中文摘要： 自由空间轨道角动量（OAM）复用具有高的频带利用率和超高容量。在复用系统中大气湍流干扰的应对方法是其实用化关键技术之一，也是当前光通信领域研究的前沿和热点。本项目将信息处理领域中纠错编码、多用户检测和信道均衡等先进的信号处理技术和轨道角动量这一重要的量子光学理论相结合，研究如何应对基于OAM复用的通信链路信道干扰。具体地：（1）将信道编码与自适应技术相给合，研究克服复用系统中大气湍流引起的单OAM态强度减弱和OAM态间能量转移的方法，减少大气湍流对OAM态通信复用的信道干扰；(2)在此基础上，分别设计OAM态多用户检测和OAM态MIMO信道均衡方法，进一步降低大气湍流对复用信道的干扰；(3)从理论和实验上探索一种抗大气湍流干扰的OAM态通信复用方案。以上研究结果对实现自由空间长距离高速光通信具有重要的理论意义和实用价值。

中文关键词： 自由空间光通信；轨道角动量；大气湍流；纠错编码和波前纠正；多输入多输出均衡

英文摘要： The OAM-multiplexed free space optical communication links are capable of reliably transferring up to terabit with a higher spectral transmission efficiency. It is currently a hot topic in optical communication, where the methods to mitigate the interference caused by atmospheric turbulence (AT) are the key techniques. In the proposal, we do research on the methods to mitigate the interference caused by atomphseric turbulence by taking advantange of channel coding, multiuse detection and multiple-input-multiple-output (MIMO) equalization in information processing area, and orbital angular momentum (OAM) states, the crutial theory and experimental techniques in quantum optics. The details are the following: (1) Combining channel coding and wavefront correction method, we propose a turbulence mitigation OAM-multiplexed scheme to improve AT tolerance. In the scheme, we use channel codes to correct the burst and random errors caused by AT for a single OAM information-carrier, and use wavefront correction method to correct the 'crosstalk' interference between different OAM information-carriers. (2) Based on the above scheme, we design a multiuser detection method with misformed OAM states and a MIMO equalizer for OAM-multiplexed communication links to further decrease the channel interference caused by AT. (3) We present a feasible experimental scheme to improve AT tolerance of OAM-multiplexed communication links. The results are significant and valuable to the long-range practical free-space optical communication links.

英文关键词： Free space optical communication;Orbital angular momentum;Atmoshperic turbulence;Error correction and wavefront correction;Multiple-input-multiple-output equalization