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以部分相干高斯-谢尔模型(GSM)光束为例,对湍流引起的漂移方差和扩展角进行模拟,综合考虑由光束漂移引起的瞄准误差和光束扩展引起的接收光功率密度的整体下降,对激光通信链路中接收端光功率进行数值计算和分析,找出激光通信系统中最佳发射光束的参数。研究结果表明,湍流大气中激光通信系统最佳发射光束的参数与光束的束腰半径、空间相干长度、波长、传播距离和湍流强度有关。部分相干GSM光束接收端光功率随着波长、光束束腰、空间相干长度和传输距离的变化存在一最优值。
Taking the partially coherent Gaussian-Shear model (GSM) beam as an example, the drift variance and spread angle caused by turbulence are simulated. Taking into account the aiming error caused by the beam drift and the overall decrease of the received light power density caused by the beam spreading, The optical power of the receiving end in the laser communication link is numerically calculated and analyzed to find out the parameters of the best transmitted beam in the laser communication system. The results show that the parameters of the laser beam emitted by the laser communication system in turbulent atmosphere are related to the beam waist radius, spatial coherence length, wavelength, propagation distance and turbulence intensity. The optical power of the partially coherent GSM beam receiving end has an optimal value as a function of wavelength, beam waist, spatial coherence length, and transmission distance.