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以直线形光纤马赫曾德尔干涉仪作为滤波器件,掺铒光纤作为增益介质的环行腔光纤激光器实现位移传感。构成该马赫曾德尔干涉仪的扩径光纤锥由光纤熔接机制作而成。随着两个应力调节支架距离的减小,干涉仪发生弯曲,输出的波峰向短波长方向移动,最大敏感度为4.49 nm/mm,消光比大于50 d B。扩径光纤锥的引入使得光纤在弯曲时能够保持基本一致的弯曲度,并且相比其他结构强度更高,不容易发生断裂。同时,该结构的制作所需材料便宜,制作过程简便,有利于工程应用。
The linear fiber Mach-Zehnder interferometer is used as the filter device, and the erbium-doped fiber is used as the gain medium to realize the displacement sensing of the ring-cavity fiber laser. The fiber-optic taper, which makes up the Mach-Zehnder interferometer, is made from a fiber splicer. As the distance between the two stress-adjusting stents decreases, the interferometer bends and the output peak shifts to short wavelengths with a maximum sensitivity of 4.49 nm / mm and extinction ratio greater than 50 dB. The introduction of the expanded diameter optical fiber cone allows the optical fiber to maintain a substantially uniform degree of curvature when bent, and has higher strength than other structures and is less prone to fracture. At the same time, the material required for the fabrication of the structure is cheap, the production process is simple and convenient for engineering application.