带有前置EDFA卫星相干激光通信终端的信噪比分析

卫星激光通信链路是一项实现卫星大规模星座组网的关键技术。相干激光链路灵敏度高、抗背景干扰、速率升级空间大，在星间激光链路中应用广泛。文章建立了带有前置掺铒光纤放大器(EDFA)的卫星相干激光通信终端的信噪比分析模型，仿真分析了EDFA功率增益、EDFA噪声系数、本振光功率、信号光功率、光放后端光带宽、基带前端电带宽对终端输出信噪比的影响以及各种输出噪声功率占比的情况，得到了带有前置EDFA卫星相干激光通信终端的信噪比参数特性。

Analysis of Signal-to-Noise-Ratio of Satellite Coherent Laser Communication Terminal with Front EDFA

Satellite laser communication link is a key technology for achieving large-scale constellation networking of satellites. Coherent laser link has high sensitivity, resistance to background interference, and large space for rate upgrade, making it widely used in inter-satellite laser link. In this paper, a signal-to-noise-ratio (SNR) analysis model was established for satellite coherent laser communication terminal with front EDFA. The effects of EDFA power gain, EDFA noise figure, local optical power, signal optical power, optical bandwidth, and electrical bandwidth on the terminal output SNR and the power ratio of various output noise were analyzed by simulation. The SNR characteristics of satellite coherent laser communication terminal with front EDFA were obtained.