带前置光放大的卫星激光通信系统的优化

考虑接收端瞄准误差对空间光到单模光纤耦合的影响,导出了带前置光放大的卫星激光通信系统中,由瞄准误差引起的突发误码率的近似解析表达式,并建立了基于突发误码率的系统优化模型。在给定突发误码率要求及发射端、接收端瞄准误差条件下,对发射光束宽度、接收天线直径及空间光耦合参数进行了优化,使所需发射功率最小,分析了接收端瞄准误差引起的功率损耗。仿真表明:在最优条件下,当接收天线直径与接收端瞄准误差标准差之乘积小于0.15个波长时,由接收端空间光耦合引起的功率损失小于2μrad。

An Optimization of Optically Preamplified Laser Satellite Communication Systems

This paper discusses the coupling loss induced by pointing error of receiver for coupling space light into single mode fiber in laser satellite communication systems with optical preamplifiers. An approximate analytical expression of burst error rate induced by pointing error is derived and an optimized model for the burst error is established. Given the desired burst error rate and the pointing error of transmitter and receiver, the transmitting beam width, receiving antenna diameter and space optical coupling parameter can be optimized so as to minimize the transmitted power, the power loss induced by pointing error of receiver is also analyzed. The simulation shows that, under the optimal conditions, the power penalty induced by space optical coupling of receiver is less than 2 dB when the product of receiving antenna diameter and the rms pointing error of receiver is less than 0.15 waves.