基于双通道M-Z干涉仪的FBG光开关研究

为降低电光开光的插入损耗并提高性能,提出了一种基于双通道可调谐马赫-曾德(M-Z)干涉仪制作的光纤布拉格光栅(fiber Bragg grating,简称FBG)光开关,通过改变干涉仪中的可调电动光纤延迟线的延迟时间,实现滤波谱周期的可调谐。通过改变干涉仪其中一臂的延迟时间设定,该光开关能够实现对设定波长光波的开关功能。对光纤M-Z干涉滤波原理进行了理论分析,使用C波段宽带放大自发辐射光源对双通道可调M-Z干涉仪的性能进行了测试。结果表明,其可实现大范围及高精度的滤波调节功能。对基于双通道可调谐马赫-曾德干涉仪制作的FBG光开关,通过FBG开关性能检测系统实验,得到该光开关在波长为1 550nm处的输出光谱,光开关的消光比达到25dB。结果表明,该光开关能够实现大范围高精度滤波功能,具有高消光比、结构简单和易于调节等优点。

Research of Optical Switch Based on Dual-pass Tunable Mach-Zehnder Interferometer

In order to improve performance and reduce the insertion losses of electro-optic switches, a fiber Bragg grating(FBG) optical switch was designed based on a dual-pass tunable Mach-Zehnder interferometer. The filtering cycle spectrum was tunable by changing the delay time of the electric adjustable fiber delay line in the interferometer. The filter principle of the optical fiber M-Z interferometer was analyzed and tested with the C-band broadband light, and the results show that it can achieve a wide range and high-precision filter adjustment function. The interferometer was also tested as a FBG optical switch. The output spectrum at a wavelength of 1550 nm was obtained through a FBG optical switch performance testing system experiment. Its side mode suppression ratio was over 25 dB. Test results show that it can achieve a large range and fine filter, and that the optical switch also has advantages of a high extinction ratio, simple structure, and easy adjustability.