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根据模间干涉原理提出了一种基于细芯光敏光纤的全光纤马赫-曾德尔干涉仪(MZI)结构,并实验制作出纤芯错位的MZI。根据数值模拟对该模间干涉仪结构进行优化,获得了干涉仪的干涉谱消光比超过20 dB。通过对该传感器进行温度响应实验,分析并讨论了干涉长度及弯曲特性对其温度灵敏度的影响,最终获得的温度灵敏度达到116 pm/°C。
According to the principle of intermodulation interference, an all-fiber Mach-Zehnder interferometer (MZI) structure based on a fine core photosensitive optical fiber is proposed, and an MZI with core misalignment is fabricated experimentally. According to the numerical simulation, the structure of the inter-mold interferometer is optimized, and the interference spectrum extinction ratio of the interferometer is over 20 dB. Through the temperature response experiment of the sensor, the influence of the interference length and the bending characteristics on the temperature sensitivity was analyzed and discussed, and finally the temperature sensitivity reached 116 pm / ° C.