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Optical Refractive-Index Sensor Based on Dual Fiber-Bragg Gratings Interposed With a Multimode-Fiber Taper

机译:基于双光纤布拉格光栅和多模光纤锥度的光学折射率传感器

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摘要

A new type of optical refractive-index (RI) sensor is proposed and experimentally demonstrated by using a structure of two single-mode fiber (SMF) Bragg gratings with a multimode fiber (MMF) taper in-between. The loss induced by a mismatch of waveguide structure between SMFs and MMFs is amplified by a tapering process, and is utilized for RI sensing through evanescent field. Experimental results show that the sensor possesses a tailorable sensitivity to the change of external RI and has a good linear response in the simultaneous measurement of external RI and temperature
机译:提出了一种新型的光学折射率(RI)传感器,并通过使用两个单模光纤(SMF)布拉格光栅与中间的多模光纤(MMF)锥度的结构进行了实验验证。由SMF和MMF之间的波导结构不匹配引起的损耗通过逐渐变细的过程被放大,并被用于通过e逝场进行RI感测。实验结果表明,该传感器对外部RI的变化具有可定制的灵敏度,并且在同时测量外部RI和温度时具有良好的线性响应

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