基于拉盖尔-高斯光束的通信系统在非Kolmogorov湍流中传输的系统容量

摘要

涡旋波束在大气湍流中的传输有非常重要的理论研究和实际应用意义。本文基于利托夫近似和广义惠更斯-菲涅耳原理，推导出拉盖尔-高斯(LG)光束在非Kolmogorov湍流中斜程传输时的螺旋谱，并进一步推导出系统的容量。对基于LG光束的通信系统容量进行了数值计算，并对指数参数、光束波长、天顶角、湍流内尺度、外尺度、结构常数对系统容量的影响进行了分析比较。本文的结论能够为LG光束在非Kolmogorov湍流中的通信提供一定的参考价值。%The propagation of vortex beam in atmospheric turbulence is of great importance in theoretical study and practical applications. Based on the Rytov approximation and extended Huygens-Fresnel integral, the analytical expressions for the spiral spectrum of the Laguerre-Gaussian (LG) beam propagating in a slant non-Kolmogorov turbulence channel have been derived and the average capacity of free space optical system is given. The average capaticy of free space optical system is examined and the effects of exponent parameter, wavelength, zenith angle, inner scale, outer scale, and structure constant on average capacity are also analyzed. Results obtained in this paper may be benefical to optical communication.