仿真和实验研究了一种控制Nd:YAG脉冲激光能量通断的光纤直接连接型光开关。建立光纤耦合模型, 分析了光纤对准误差中对耦合效率的影响, 其中横向偏移的影响最显著。采用微机电系统V型槽固定光纤, 微小型凸轮作为制动器, 步进电机驱动凸轮旋转, 微小型凸轮与移动光纤相切, 带动光纤移动, 实现两光纤的错开和对准。制造了这种高功率直接连接型光纤光开关原理样机, 并进行了主要性能测试。测试结果表明, 这种光开关能够满足激光点火系统的大容量、高隔离度的要求。

An optical switch based on direct fiber coupling for high power transfer has been investigated by simulations and experiments. The switch employs MEMS V-grooves for optical fiber fixture, a miniture cam as the actuator and a stepper motor as the drive source, and thus achieves the fiber alignment by the rotary movement of the cam. The switch model was built by using optical simulation software ZEMAX. The effects of mechanical misalignments on fiber to fiber coupling efficiency were then investigated, showing that the effect of lateral misalignment is most significant. The prototype of this switch has been designed and fabricated. Corresponding tests show that the switch has the high power handling capacity and high isolation required in laser ignition systems．(S20070202)