论文部分内容阅读
采用光纤部件的自由空间光通信系统需要把接收到的光束耦合进单模光纤中,然而由于大气湍流的影响,使光纤耦合效率下降。自适应光学能够减小大气湍流效应,提高光纤耦合效率,根据大气湍流参数的空间光到单模光纤耦合效率表达式,得到了自适应光学校正下单模光纤耦合效率表达式,仿真结果显示:自适应光学能够增加空间相干长度,从而有效提高光纤耦合效率。同时还研究了斯特列尔比与耦合效率的关系,结果表明:无论有无自适应光学校正,两者都具有很好的拟合关系,因此在实际中可以用比较简单的斯特列尔比近似估计耦合效率。
Free-space optical communication systems using fiber optic components require the received light beam to be coupled into a single-mode optical fiber, however, the fiber coupling efficiency is reduced due to the effects of atmospheric turbulence. Adaptive optics can reduce the atmospheric turbulence effect and improve the fiber coupling efficiency. According to the atmospheric light-to-single-mode fiber coupling efficiency expression of atmospheric turbulence parameters, the coupling efficiency of single-mode fiber with adaptive optical correction is obtained. The simulation results show that: Adaptive optics can increase the spatial coherence length, thus effectively improve the fiber coupling efficiency. At the same time, the relationship between the Stirling ratio and the coupling efficiency is also studied. The results show that both of them have a good fitting relationship with or without adaptive optical correction, so in practice, Approximately estimates the coupling efficiency.