基于波前相位校正的OAM-SK FSO通信系统误码率性能研究  

Research on BER performance of the OAM-SK FSO communication system with wavefront phase correction

作　　者：李爽 王平[1] 刘涛[1] 潘宇婷 王炜 LI Shuang;WANG Ping;LIU Tao;PAN Yuting;WANG Wei(State Key Laboratory of Integrated Service Networks,School of Telecommunications Engineering,Xidian University,Xi’an 710071,China)

机构地区：[1]西安电子科技大学通信工程学院综合业务网国家重点实验室,陕西西安710071

出　　处：《通信学报》2022年第5期14-23,共10页Journal on Communications

基　　金：国家自然科学基金资助项目(No.62071365);陕西省重点研发计划基金资助项目(No.2022GY-103)。

摘　　要：弱大气湍流条件下,针对轨道角动量键控自由空间光通信系统,基于Gerchberg-Saxton算法和角谱理论,提出了一种改进的Laguerre-Gaussian光束波前相位校正算法。该算法将传输前后探测光束的光场分布作为输入,利用迭代计算得到的相位掩膜校正畸变的传输光束,从而减缓大气湍流引起的模间串扰效应。仿真结果表明,改进的波前相位校正算法明显优于传统的GS算法,且随着折射率结构参数的增加,系统的误码率性能得到显著提升。On the basis of Gerchberg-Saxton(GS)algorithm and angular-spectrum theory,an improved wavefront phase correction algorithm to the Laguerre-Gaussian(LG)beams was proposed for the orbital angular momentum-shift keying(OAM-SK)modulation-based free space optical(FSO)communication system under weak atmospheric turbulence.The light field distributions of the probe beam at transmitter and receiver were regarded as the input of the improved wavefront phase correction algorithm.And the correction phase mask was iteratively calculated to correct the distorted LG beams,thereby alleviating the inter-model crosstalk caused by atmospheric turbulence.Simulation results show that the improved wavefront phase correction algorithm is superior to the conditional GS algorithm.And with the increase of the refractive-index structure parameter,the bit error rate(BER)performance of the OAM-SK FSO communication system is significantly improved.

关 键 词：自由空间光通信 轨道角动量 相位校正 角谱理论 误码率 

分 类 号：TN929.12[电子电信—通信与信息系统]