Takenaka Hideki, Toyoshima Morio, Takayama Yoshihisa
Space Communication Systems Laboratory, Wireless Network Research Institute, National Institute of Information and Communications Technology (NICT), 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184-8795, Japan.
Opt Express. 2012 Jul 2;20(14):15301-8. doi: 10.1364/OE.20.015301.
Optical communication is a high-capacity method that can handle considerable satellite data. When common-fiber optical devices such as optical fiber amplifiers based on single mode fibers are used in free-space laser communication systems, the laser beam has to be coupled to a single-mode fiber. Under atmospheric turbulence it would be difficult to make the required fiber coupling efficiency in satellite-to-ground laser propagation paths. A fast-steering mirror that can operate at high frequencies under atmospheric turbulence is fabricated, and its tracking performance is verified in real satellite-to-ground laser communication experiments. The measured fiber coupling loss of 10-19 dB in satellite-to-ground laser communication links under atmospheric turbulence shows good agreement with the predicted fiber coupling efficiency of 17 dB.
光通信是一种能够处理大量卫星数据的高容量方法。当基于单模光纤的光纤放大器等普通光纤光学器件用于自由空间激光通信系统时，激光束必须耦合到单模光纤中。在大气湍流条件下，在卫星到地面的激光传播路径中很难实现所需的光纤耦合效率。制造了一种能够在大气湍流条件下高频运行的快速转向镜，并在实际的卫星到地面激光通信实验中验证了其跟踪性能。在大气湍流条件下，卫星到地面激光通信链路中测得的光纤耦合损耗为10 - 19 dB，与预测的17 dB光纤耦合效率吻合良好。
