Efficiently coupling Gaussian beams into single-mode fibers (SMF) plays an important role in scientific experiments. However, the optical misalignment will decrease the coupling efficiency dramatically. In this paper, we proposed and investigated a SMF auto-coupling system consisting of two wedges driven by stepper motors. We simulated and analysed the dual-wedge system’s ability of correcting optical misalignment and experimentally demonstrated the feasibility of this proposal. The results show that when the optical path is misaligned within a certain range, by automatically rotating the two wedges, the system can restore the efficiency to near the manually optimal coupling efficiency. The system inherits the stability of the stepper motors and will be beneficial for space applications and other unmanned scientific experiments.

有效地将高斯光束耦合到单模光纤（SMF）中，在科学实验中起着重要作用。然而，光学失准将大大降低耦合效率。在本文中，我们提出并研究了一个SMF自动耦合系统，该系统由两个由步进电机驱动的楔形组成。我们模拟并分析了双楔系统校正光学失准的能力，并通过实验证明了该建议的可行性。结果表明，当光路在一定范围内未对准时，通过自动旋转两个楔形片，系统可以将效率恢复到手动最佳耦合效率附近。该系统继承了步进电机的稳定性，将有利于太空应用和其他无人科学实验。