大气湍流对激光通信系统影响的数值模拟  

Research on the effect of the atmospheric turbulence on laser communication system

作　　者：宿伟[1] 齐文宗[1] 

机构地区：[1]四川大学电子信息学院

出　　处：《激光与红外》2009年第8期813-816,共4页Laser & Infrared

摘　　要：从大气湍流对激光传输的影响出发,在Rytov和Tartaskii理论模型的基础上,得到激光通信系统的信噪比(SNR)、误码率(BER)和光强起伏之间的关系,并对信噪比和误码率在不同湍流强度、不同波长下随传输距离的变化进行了数值模拟。结果表明:大气湍流对系统误码率和信噪比均有明显的影响,且对误码率的影响超过信噪比占主要地位,在不同湍流强度下,误码率随着湍流强度的增加起初以指数形式迅速增长,最后趋于同一值,传输的最大距离有显著的变化,使用长波长的激光可以增加信号传播的有效距离,提高激光的通信质量。From analyzing the effect of the atmospheric turbulence on laser communication system, based on the theory model of Rytov and Tartaskii and ignoring other noises in the system, the signal-to-noise ratio（SNR） and the bit error rate（BER） between which the relationship and intensity variance was deduced in laser communication system, then made numerical simulation which varied with distance in different turbulence and different wavelength. The result indi- cates that the intensity of atmosphere turbulence has great impact on both BER and SNR of the system,and it affects the former more. BER follows an exponential growth curve as the intensity of atmosphere turbulence increases initially and finally tends to be maintain the same value, during which course, the maximum effective range of the transmission varies. Adopting laser with longest wave to communicate can increase effective distance of the signal transmission and improve the quality of laser communication system.

关 键 词：大气湍流 光强起伏 信噪比 误码率 

分 类 号：TN929.13[电子电信—通信与信息系统]