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在入射光瞳面处针对星地激光链路中空间光至单模光纤耦合效率补偿特性进行了研究,依据星地下行链路特点,对星地下行链路光纤耦合效率模型进行分析。在此基础上,利用基于单模光纤后向传输模场为加权函数的加权孔径正交多项式,建立光纤耦合接收系统波前相位模式补偿理论模型,运用该理论模型,通过数值模拟对波前相位进行模式补偿,给出波前相位模式补偿下平均光纤耦合效率与接收孔径尺寸和相位补偿项数的变化关系,以及典型接收孔径下采取一定项数的波前相位补偿后光纤耦合效率概率分布,为基于光纤耦合接收方式的星地激光通信链路波前补偿系统设计提供一定理论参考。
At the entrance pupil plane, the coupling efficiency of the space-to-single-mode fiber in the laser-to-ground laser link is studied. According to the characteristics of the satellite downlink, the optical fiber coupling efficiency model of the satellite to the downlink is analyzed. On this basis, the theoretical model of wavefront phase mode compensation for fiber coupled receiving system is established by using the weighted aperture orthogonal polynomials based on the mode field of the single mode fiber as the weighting function. By using this theoretical model, Mode compensation, the relationship between average fiber coupling efficiency and receiving aperture size and phase compensation term in wave front phase mode compensation is given, and the probability distribution of fiber coupling efficiency after taking a certain number of wavefront phase compensation under typical receiving aperture is given. It provides a theoretical reference for the design of the wavefront compensation system of the ground laser communication link based on the fiber coupled receiving mode.