Analysis of the orbital angular momentum spectrum for Laguerre-Gaussian beams under moderate-to-strong marine-atmospheric turbulent channels
Analysis of the orbital angular momentum spectrum for Laguerre-Gaussian beams under moderate-to-strong marine-atmospheric turbulent channels
复制标题
中强海洋-大气湍流通道下拉盖尔-高斯光束轨道角动量谱分析
DOI：
10.1016/j.optcom.2018.05.061
复制
发表时间：
2018-11-01
影响因子：
2.4
通讯作者：
Xin, Xiang-jun
中科院分区：
文献类型：
--
作者：
Cui, Xiao-zhou;Yin, Xiao-li;Xin, Xiang-jun
基于轨道角动量（OAM）的自由空间光（FSO）通信可以用于增强用于船对船或船对飞机通信的系统的容量。研究海洋大气信道下的OAM频谱对于分析FSO-OAM通信系统的性能具有重要意义。本文提出了一种新的、简洁的拉盖尔-高斯（LG）光束在中强海洋-大气湍流信道中传输的OAM谱的形式，并具有较高的精度。我们使用一个简洁的表达式来分析调查的规则，在OAM光谱与OAM数，距离，折射率结构参数，和波长的变化。我们证明了海洋大气信道引起的OAM谱的展宽可以基于一个简化的表达式进行解析研究。结果表明，随着透射OAM数、距离和折射率结构参数的增加，OAM谱的展宽加剧，而使用较大的波长可以缓解这种展宽。这些数据有助于海洋大气湍流信道下FSO-OAM复用通信系统的分析和未来海上通信系统的设计。
Free-space optical (FSO) communication based on orbital angular momentum (OAM) can be used to enhance the capacity of systems for vessel-to-vessel or ship-to-aircraft communication. Studying the OAM spectrum is important for analyzing the performance of FSO-OAM communication systems under marine-atmosphere channels. This study offers a new, concise form for the OAM spectrum for Laguerre-Gaussian (LG) beams propagating under moderate-to-strong marine-atmospheric turbulent channels with high accuracy. We use a concise expression to analytically investigate the rules governing the variation in the OAM spectrum versus OAM number, distance, refractive-index structure parameter, and wavelength. We demonstrate that broadening of the OAM spectrum caused by marine-atmospheric channels can be analytically studied based on a simplified expression. The results indicate that an increase in the transmitted OAM number, distance and refractive-index structure parameter exacerbates broadening of the OAM spectrum and that using a larger wavelength relieves such broadening. This data contributes to the analysis of FSO-OAM multiplexing communication systems under marine-atmospheric turbulent channels and the design of future over-the-sea communication systems.