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提出并演示了一种基于大直径光纤锥的马赫曾德尔干涉仪应力传感器。以锥形光纤马赫曾德尔干涉仪作为滤波器,对掺铒光纤的增益谱进行梳状滤波,最终在环行光纤谐振腔中实现激光的产生并输出。所采用的马赫曾德尔干涉仪在作为滤波器件的同时也能够对光纤轴向应力进行传感,最终实现激光器输出波长随应力增加而向短波长方向漂移,实验结果显示其在波长1 557 nm附近传感的敏感度达到了3 pm/με。基于该锥形光纤的马赫曾德尔干涉仪具有成本低、制作简便和机械强度高的优点,使其更有利于商业化规模制作。
A Mach-Zehnder interferometer stress sensor based on a large diameter fiber cone is presented and demonstrated. Using the tapered fiber Mach-Zehnder interferometer as a filter, the gain spectrum of the erbium-doped fiber is comb-filtered, and finally laser light is generated and output in a ring fiber resonator. The Mach-Zehnder interferometer used as the filter device can also sense the axial stress of the optical fiber, and finally the output wavelength of the laser drifts toward the short wavelength direction as the stress increases. The experimental results show that at a wavelength of 1 557 nm Sensitivity of sensing reached 3 pm / με. The Mach-Zehnder interferometer based on the tapered fiber has the advantages of low cost, simple manufacture and high mechanical strength, making it more conducive to commercial scale production.