湍流大气中激光通信系统接收光功率的优化研究  

Optimal Selection of Receiving Optical Power in Laser Communication System in Atmospheric Turbulence

作　　者：高铎瑞 付强[1] 赵昭[2] 

机构地区：[1]长春理工大学空地激光通信技术国防重点学科实验室,吉林长春130022 [2]长春理工大学光电工程学院,吉林长春130022

出　　处：《激光与光电子学进展》2014年第5期35-40,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(60677009);国防重点基础科研项目

摘　　要：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 partially coherent Gaussian-Schell model （GSM） beam as an example to get the best launch parameters of laser communication system, considering overall decline of the alignment adaption loss caused by beam drift and decrease of receiving optical power density induced by beam expanding, some numerical calculation and analysis on the receiving power in the laser link are necessary. Results represent that in atmospheric turbulence the best launch parameters of laser communication system are related to beam waist radius, spatial coherent length, wavelength, propagation distance and turbulence intensity. There exists an optimal value when the receiving power density of the partially coherent GSM beam changes with the variance of the wavelength, beam width, degree of coherence and transmission distance.

关 键 词：激光通信 功率损耗 大气湍流 光束漂移 光束扩展 

分 类 号：TN929.12[电子电信—通信与信息系统]