针对大气湍流中激光通信耦合效率的优化设计  

Optimal design of coupling efficiency for laser communication in atmospheric turbulence

作　　者：王晓艳[1] 徐高魁 WANG Xiaoyan;XU Gaokui(Southwest Forestry University,Kunming 650224,Chin)

机构地区：[1]西南林业大学

出　　处：《激光杂志》2018年第7期126-129,共4页Laser Journal

基　　金：国家自然科学基金(No.61171179)

摘　　要：对于在大气湍流条件下的空间激光通信而言,为了提高其与光纤传输系统的耦合效率,优化设计了系统的光学耦合结构。在分析了湍流对耦合效率影响的基础上,给出了湍流条件下的耦合效率函数。对影响耦合效率的两个主要参数进行了仿真分析,得到了耦合效率在不同D/f和D/r0条件下的函数分布。针对仿真分析结果设计了调焦系统与锥形光纤端面结构,并给出了优化后的等效数值孔径表达式。实验对1550nm激光在2.0km远距离上的耦合效率进行了测试,结果显示,焦距在80mm至240mm范围内变化过程中,耦合效率存在明显的最优位置,同时,采用锥形光纤端面的耦合效率比传统光纤端面效果更好,验证了系统的可行性。For space laser communication under atmospheric turbulence conditions,the optical coupling structure of the system was optimized in order to improve the coupling efficiency with the optical fiber transmission system. Based on the analysis of the influence of turbulence on the coupling efficiency,the coupling efficiency function was given under turbulent flow conditions. The two main parameters that affects the coupling efficiency were simulated. Under different D/f and D/r0 conditions,the functional distribution of the coupling efficiency was obtained. According to the result of simulation analysis,focusing system and tapered fiber end face structure were designed. At the same time,the optimized equivalent numerical aperture expression was also given. In experiments,the coupling efficiency test was done at a distance of 2. 0 km with a 1550 nm laser. The results show that there is a significant optimal coupling efficiency in the focal length of 80 ~ 240 mm. At the same time,the coupling efficiency of tapered fiber end face is better than traditional fiber end face. It verifies the system＇s viability.

关 键 词：耦合效率 激光通信 锥形光纤端面 大气湍流 

分 类 号：TN929[电子电信—通信与信息系统]