一种提高卫星光通信终端发射效率的新方法

俞建杰; 谭立英; 马晶; 韩琦琦; 杨玉强; 李密

中国激光, 2009, 36 (3): 581, 网络出版: 2009-03-17

一种提高卫星光通信终端发射效率的新方法

A Novel Method to Improve the Emission Efficiency of Satellite Optical Communication Terminal

论文大纲

俞建杰 ^*谭立英马晶韩琦琦杨玉强李密

作者单位

哈尔滨工业大学可调谐激光技术国家级重点实验室, 黑龙江哈尔滨 150080

光通信发射效率衍射光学元件光束整形 optical communication emission efficiency diffractive optical elements (DOE) beam shaping

摘要

在采用同轴反射式光学天线的卫星光通信终端中,发射光束受天线次镜的遮挡,将损失部分能量。为消除次镜遮挡,提高光通信终端的发射效率,提出一种基于衍射光学元件的新方法。该方法利用衍射原理将光束整形为圆环光束,以规避次镜遮挡。按照遮挡比和切断比固定和变化这两类情况进行了仿真设计,前一类仿真结果表明：当遮挡比为15,切断比为1.5时,远场强度峰值提高了40%。后一类情况的仿真结果则表明：遮挡比越大,系统透过率和远场峰值强度越高,远场光束的主瓣宽度和强度峰值相对增量则分别变窄和变低;切断比越大,强度峰值的相对增量也越大。该方法提高了卫星光通信系统发射端的发射效率,同时也改善了接收端的光束质量。

Abstract

In satellite optical communication transmitter with reflective telescope of two-mirror on axis, a large mount of the transmitted energy will be obscured by the secondary mirror. A novel method based on diffractive optical elements (DOE) is proposed for offsetting it. The beam centrally obscured is reshaped to annulus beam by a diffractive beam shaper and another phase corrector, as a result central obscuration is avoided. Numerical simulation is carried out with fixed obscuraction ratio and truncation ratio, and variation of them, respectively. Subsequent numerical simulation reveals that peak energy of far field is raised about forty percent under the condition of obscuration ratio is 15, and truncation ratio is 1.5. And numerical modelling of the latter are as follows: the larger obscuraction ratio, the larger transmission efficiency of whole system and peak energy of the far field, the narrower the width of main lobe of far field pattern, and the lower relative increment of peak energy; The larger truncation ratio, the larger relative increment of peak energy of beam in far field. This work can improve the emission efficiency of transmitter and energy density of receiver plane in satellite optical communication system.

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俞建杰, 谭立英, 马晶, 韩琦琦, 杨玉强, 李密. 一种提高卫星光通信终端发射效率的新方法[J]. 中国激光, 2009, 36(3): 581. Yu Jianjie, Tan Liying, Ma Jing, Han Qiqi, Yang Yuqiang, Li Mi. A Novel Method to Improve the Emission Efficiency of Satellite Optical Communication Terminal[J]. Chinese Journal of Lasers, 2009, 36(3): 581.

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