卫星激光通信均匀信标光的研究  

Study on the Uniform Beacon Used for the Free Space Laser Communication

作　　者：王建民[1] 汤俊雄[1] 孙东喜[1] 朱彦[1] 谷亚权[1] 

机构地区：[1]北京大学电子学系量子信息与测量教育部重点实验室,北京100871

出　　处：《光学学报》2006年第1期7-10,共4页Acta Optica Sinica

基　　金：国家自然科学基金(60377028);国防重点实验室基金(51473040205-JW0201)资助课题

摘　　要：采用信标光是完成卫星激光通信捕获过程的一种重要手段,信标光的远场分布对捕捉概率和捕获时间有较大的影响。为满足通信系统的性能要求,对信标的远场分布提出一定的要求是必要的。首先从理论计算的角度,分析了远场高斯分布信标光对卫星激光通信捕获过程的影响,认为在存在光束抖动的情况下,均匀信标光在捕获阶段具有明显的优势。基于多激光器合束技术,利用半导体激光器设计了一个能实现远场均匀分布的信标光模块。给出了模块结构,分析了均匀信标光产生的机理,并从理论上推导了该模块的远场光强分布表达式。实验表明,所研制的均匀信标光模块可出射功率超过3.8 W,不均匀度小于11%的远场均匀信标光,通光效率为54%,从而证明了所设计的信标光模块的可行性。Using a beacon in the free space laser communication system is an important method of finishing the acquisition course. The far-field distribution of a beacon affects seriously the acquisition time and acquisition probability. In order to satisfy practical performance requirements, it is necessary to design the far-field distribution of a beacon. First, the impact of a far-field Gaussian distribution beacon on the acquisition course of laser communication is analysed and the far-field uniform beacon has some advantage compared with the far field Gaussian beacon in the case of transmitting beam jitter. One kind of far-field uniform beacon model is developed on the base of combination of semiconductor lasers. The structure of the model is described, the operating principle of model is analysed and the far-field distribution expression of the beam is derived. Experiment＇s data indicate that transmitting power of the model is more than 3.8 W, the degree of non-uniformity is less than 11% and the coupling efficiency is 54 %, so the feasibility of the model is proved.

关 键 词：卫星激光通信 均匀信标光 半导体激光器 光纤 

分 类 号：TN929[电子电信—通信与信息系统]