临近空间对地面空间激光通信光纤耦合效率研究

Research on Fiber Coupling Efficiency of Laser Communications from Near Space to Ground

空间激光通信朝着小型化、高速率、大容量方向发展,这对载人航天工程数据高速传输十分有利。针对临近空间对地面平台,比较了海拔高度20km空域内不同大气折射率结构常数模型,分析了它与Fried参数的关系,得出斜程链路环境中天顶角、链路距离、近地面折射率结构常数与耦合效率的关系。仿真结果显示,近地面大气折射率结构常数处于不同范围时,耦合效率对天顶角变化的敏感程度不一样,而且耦合效率很大程度受100m以内的链路影响。

Space laser communication is developing in a direction of small size, high speed, and large capacity, which will be ben- eficial to the high speed transmission of manned space engineering data. Different models of atmospheric refractive in- dex structure parameters within the altitude of 20km are discussed, in order to make a comparison with Fried parame- ter. The relationship between zenith angle, link distance and coupling efficiency are concluded. Results of simulation show that when the near-surface refractive index structure parameters are at different ranges, the sensitivity of the cou- pling efficiency to the zenith angle variation are different, and the coupling efficiency is greatly influenced by the fink distance within lOOm.