光学学报, 2014, 34 (s2): s201004, 网络出版: 2014-12-02
基于Kolmogorov模型的大气湍流对于空间光通信轨道角动量模式间串扰影响的研究
Study of Orbital Angular Momentum Mode Crosstalk Caused by Atmospheric Turbulence Based on Kolmogorov Model in Free Space Optical Communication
大气光学 轨道角动量 拉盖尔高斯模式 光通信 信道串扰 atmospheric optics orbital angular momentum Laguerre-Gaussian mode optical communications channel crosstalk
摘要
讨论了基于Kolmogorov模型的大气湍流对于自由空间光通信轨道角动量(OAM)模式正交性、光束强度以及相位分布的影响。仿真研究了不同大气湍流强度对轨道角动量模式复用光通信系统中相邻模式之间的串扰。仿真结果表明,在弱大气湍流条件下,连续轨道角动量模式可以作为短距离自由空间光通信中的模式分配方案。在中等大气湍流条件下,轨道角动量模式间隔应该至少为3,才能保证信号串扰不至于影响到接收端的信号提取。
Abstract
The influences on orthogonality, intensity and phase distribution of orbital angular momentum (OAM) mode based on Kolmogorov spectrum model in free space optical communication are discussed. Furthermore, the impact of crosstalk between OAM modes by different atmospheric turbulences strength is studied. The simulation results show that continuous orbital angular momentum modes multiplexing can be used as a scheme in short distance free space optical communication under weak atmospheric turbulence. However, when introducing moderate atmospheric turbulence, in order to ensure that the signal extraction not be influenced by the crosstalk at receiver, the multiplex interval of orbital angular momentum modes is at least equal to 3.
张磊, 宿晓飞, 张霞, 张晓光, 席丽霞. 基于Kolmogorov模型的大气湍流对于空间光通信轨道角动量模式间串扰影响的研究[J]. 光学学报, 2014, 34(s2): s201004. Zhang Lei, Su Xiaofei, Zhang Xia, Zhang Xiaoguang, Xi Lixia. Study of Orbital Angular Momentum Mode Crosstalk Caused by Atmospheric Turbulence Based on Kolmogorov Model in Free Space Optical Communication[J]. Acta Optica Sinica, 2014, 34(s2): s201004.