中国激光, 2010, 37 (11): 2860, 网络出版: 2010-11-16
湍流大气信道激光透射率的研究
Research of the Transmittance of Atmospheric Turbulent Channels
光通信 自由空间光通信 大气透射率 高斯分布 湍流 大气折射率结构常数 optical communications free space optical communication atmospheric transmittance Gauss distribution turbulence atmospheric refractive-index structure parameter
摘要
自由信道的大气透射率对自由空间光通信系统的设计和应用具有重要的价值, 经典的大气透射率测量方法的精度水平已不能满足实际需求。结合实际应用中激光器光束能量的高斯分布特性和存在于大气信道中的湍流影响特性, 对经典的大气透射率测量方法进行了改进, 提出了大气透射率精确测量的实验方案。对上海和青海的多条自由空间信道的大气透射率采用经典方法与新提出方法分别进行了测量, 得到的结果之间存在差异。发现青海的大气透射率很高, 但是大气湍流相对严重, 而上海的大气情况正好相反。分析和实验数据还表明经过长距离湍流信道后光斑扩展严重。
Abstract
The atmospheric transmittance is valuable in designing and applying free space optical communication system. The precision of classical method can not meet actual needs. In this paper, by ameliorating classical method of measuring atmospheric transmittance, and combining the Gauss distribution of the energy of the laser beam and the turbulent influence existing in the atmospheric channel, the experiment scheme of accurately measuring atmospheric transmittance is designed. Actual atmospheric transmittance of several free space channels in Shanghai and Qinghai are measured. The results of classical method and the method which we mention above are different. The results show that, in Qinghai, the transmittance is high, but turbulence is bad; in Shanghai, the situation is opposite. The analytic and experimental results also indicate that the distant turbulent channels influence facular spread strongly.
杨世骥, 何志平, 贾建军, 吴金才, 王建宇. 湍流大气信道激光透射率的研究[J]. 中国激光, 2010, 37(11): 2860. Yang Shiji, He Zhiping, Jia Jianjun, Wu Jincai, Wang Jianyu. Research of the Transmittance of Atmospheric Turbulent Channels[J]. Chinese Journal of Lasers, 2010, 37(11): 2860.