Ultra-short phase-shifted fiber Bragg grating in a microprobe for refractive index sensor with temperature compensation
Ultra-short phase-shifted fiber Bragg grating in a microprobe for refractive index sensor with temperature compensation
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DOI：
10.1016/j.optlastec.2022.108672
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发表时间：
2022-09-18
影响因子：
5
通讯作者：
Yang, Gang
中科院分区：
文献类型：
--
作者：
Chen, Mao-qing;He, Tong-yue;Yang, Gang
提出了一种由级联微通道构成的超短相移光纤布拉格光栅(PS-FBG)，并进行了实验验证。基于飞秒激光微加工技术，在微探头中制作了级联微通道，并在靠近微探头的单模光纤(SMF)的芯部写入了光纤布拉格光栅(FBG)。超短PS-FBG对折射率(RI)和温度都敏感，而FBG只对温度敏感，可以用来补偿温度串扰。微探头的长度小于150微米，直径约为40微米，超短PS-FBG的总长度小于95微米，约为传统FBG的五分之一。实验结果表明，PS-FBG的RI灵敏度在1.3323~1.3797的范围内为463.7953 nm/riu，在40~80℃温度范围内的温度灵敏度约为-28.9 pm/℃，基于传输矩阵法可以很好地抑制温度串扰。
Ultra-short phase-shifted fiber Bragg grating (PS-FBG) composed of cascaded microchannels is proposed and demonstrated experimentally. The cascaded microchannels are fabricated based on femtosecond (fs) laser micromachining technology in the microprobe and a fiber Bragg grating (FBG) is written in the core of single-mode fiber (SMF) near the microprobe. Ultra-short PS-FBG is sensitive to both refractive index (RI) and temperature, while FBG is only sensitive to temperature, so FBG can be used to compensate temperature crosstalk. The length of the microprobe is less than 150 mu m and its diameter is about 40 mu m, and the total length of the ultra-short PS-FBG is less than 95 mu m, which is about one fiftieth of the traditional FBG. Experimental results show that the RI sensitivity of the PS-FBG is 463.7953 nm/RIU in the range of 1.3323 similar to 1.3797, the temperature sensitivity is about -28.9 pm/degrees C from 40 degrees C to 80 degrees C, and the temperature crosstalk can be well suppressed based on the transfer matrix method.