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一、前言卫星之间如果使用激光通信将具有以下优点,①使用小天线就能进行大容量通信,②系统间的干扰可以忽略不计。最近,随着光纤以及大功率输出半导体激光和高密度CCD器件的出现,有力地促进了卫星之间光通信技术的实现,目前许多国家为此进行积极研究开发。实现卫星间光通信(Optical Inter-satellite Links)中的主要技术课题是确立10μ弧度以下的方向性极强的光束控制技术,还有相干通信方式、大功率输出半导体激光调制等光调制解调技术,以及进一步提高半
I. INTRODUCTION If the use of laser communication between satellites will have the following advantages, ① large capacity communication is possible using small antennas, and ② interference between systems is negligible. Recently, with the advent of optical fibers and high-power semiconductor laser and high-density CCD devices, the realization of optical communication technologies between satellites has been vigorously promoted. At present, many countries actively do research and development for this purpose. The main technical issue in achieving optical inter-satellite links is to establish extremely directional light beam steering techniques below 10μ radians, as well as optical modulation and demodulation techniques such as coherent communication and high power output semiconductor laser modulation , And further improve the semi-