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空间激光到单模光纤(SMF)耦合技术是自由空间激光通信中的关键技术之一。在Matlab环境下仿真分析了单项波前像差和大气湍流像差对空间光到SMF耦合效率的影响,研究了随机并行梯度下降(SPGD)算法校正大气湍流中整体倾斜像差的迭代过程及对耦合效率的影响。仿真结果表明,SMF耦合效率随单项波前像差均方根(RMS)增加而降低,校正大气湍流中整体倾斜像差后,SMF耦合效率都有提高;当D/r0较小时,大气湍流像差中影响SMF耦合效率的主要像差为倾斜像差。搭建了基于SPGD算法的闭环控制系统,利用自适应光纤耦合器(AFC)校正模拟湍流倾斜像差后,SMF平均耦合效率从30.07%提升到了61.72%;耦合效率的均方误差(MSE)从7.28%降低到2.16%。
Spatial laser to single mode fiber (SMF) coupling technology is one of the key technologies in free space laser communication. The effect of single wavefront aberration and atmospheric turbulence aberration on the coupling efficiency of space light to SMF is simulated and analyzed in the Matlab environment. The iterative process of stochastic parallel gradient descent (SPGD) algorithm to correct global tilt aberration in atmospheric turbulence is studied. Effect of coupling efficiency. The simulation results show that the SMF coupling efficiency decreases with the increase of single-wave front aberration (RMS), and the SMF coupling efficiency is improved after correcting the overall tilt aberration in atmospheric turbulence. When D / r0 is small, the atmospheric turbulence The main aberration affecting the SMF coupling efficiency in the difference is the oblique aberration. The closed-loop control system based on SPGD algorithm is built. The average coupling efficiency of SMF is improved from 30.07% to 61.72% using adaptive fiber coupler (AFC), and the mean square error (MSE) of coupling efficiency is increased from 7.28 % Down to 2.16%.