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文中介绍了卫星间激光通信系统的构成,分析比较了非相干的IM/DD系统和相干光通信系统的性能。指出对于同步卫星间这种超长距离的光通信系统,高的接收灵敏度是至关重要的,因而,相干光通信技术更有优势;但对于中低轨道卫星光通信系统,由于多普勒效应的影响,采用IM/DD技术是更恰当的。
This paper introduces the structure of satellite laser communication system, analyzes and compares the performance of non-coherent IM / DD system and coherent optical communication system. It is pointed out that the high receiving sensitivity is very important for the long-distance optical communication system between synchronous satellites. Therefore, coherent optical communication technology is more advantageous. However, for the low orbit satellite optical communication system, due to the Doppler effect The impact of using IM / DD technology is more appropriate.