纳秒量级开关时间的全光纤磁光开关

采用磁光晶体薄膜、半波片、偏振分束器、偏振合束器和高速法拉第转子等元器件研制了一种具有新型光路的1×2全光纤磁光开关,以用于全光网络通信. 采用雪崩晶体管设计和制作了多种纳秒脉冲发生器,用于驱动法拉第转子中的微型螺线管. 对螺线管的尺寸和结构布局进行了优化设计,并分析螺线管的磁场强度和自感系数等性能参量,以提高磁光开关的开关速度. 磁光开关的性能测试结果表明,纳秒脉冲上升时间为2～5 ns、脉冲宽度为6～12 ns、脉冲幅值为30～150 V. 磁光开关的插入损耗为1.55 dB,串扰为23.69 dB,消光比为-23.69 dB,开关时间为100～400 ns. 该全光纤磁光开关的开关时间已达到纳秒量级.

All-fiber Magneto-optic Switch with the Nanosecond-level Switching-time

The 1×2 all-fiber magneto-optic switch with the novel optical route is studied for the all-optical networking, by means of the magneto-optic crystal film, the half-wave plate, the polarized beam splitter, the polarized beam combiner, and the high-speed Faraday rotator etc. Some nanosecond pulse generators are designed and fabricated by the avalanche dynatrons, in order to actuate the miniature solenoid in the Faraday rotator. The dimensions and structure layout of the solenoid are designed optimally, while the magnetic field intensity and the self-inductance coefficient are analyzed to enhance the switching-speed of the magneto-optic switch. The performance measurement results state that the rising-time of the nanosecond pulse is 2～5 ns, the pulse width is 6～12 ns, and the pulse amplitude is 30～150 V. For the all-fiber magneto-optic switch, the insertion loss is 1.55 dB, the crosstalk is 23.69 dB, the extinction ratio is -23.69 dB, and the switching-time is 100～400 ns. The switching-time of the all-fiber magneto-optic switch has reached the nanosecond level.