Numerical and Experimental Analysis of Sensitivity-Enhanced RI Sensor Based on Ex-TFG in Thin Cladding Fiber
Numerical and Experimental Analysis of Sensitivity-Enhanced RI Sensor Based on Ex-TFG in Thin Cladding Fiber
复制标题
DOI：
10.1109/jlt.2015.2422076
复制
发表时间：
2015-07-15
影响因子：
4.7
通讯作者：
Zhang, Lin
中科院分区：
文献类型：
--
作者：
Yan, Zhijun;Sun, Zhongyuan;Zhang, Lin
我们报道了一种水溶液中高灵敏度的折射率（RI）传感器，该传感器基于81度倾斜的光纤光栅结构，嵌入包层半径为40 μ m的薄包层光纤中。数值分析表明，减小包层尺寸可显著提高光栅包层共振模式的RI灵敏度。实验结果证明了这一点：在包层半径为62.5 μ m的标准电信光纤中，同样的光栅结构，在1.345折射率区，TM和TE共振峰的RI灵敏度分别从200 nm/RIU和170 nm/RIU提高到1180 nm/RIU和1150 nm/RIU。虽然温度灵敏度也有所提高，但与RI灵敏度增强相比，温度灵敏度的变化仍然不显著。
We report a highly sensitive refractive index (RI) sensor in the aqueous solution, which is based on an 81 degrees-tilted fiber grating structure inscribed into a thin cladding fiber with 40 mu m cladding radius. The numerical analysis has indicated that the RI sensitivity of cladding resonance mode of the grating can be significantly enhanced with reducing cladding size. This has been proved by the experimental results as the RI sensitivities of TM and TE resonance peaks in the index region of 1.345 have been increased to 1180 nm/RIU and 1150 nm/RIU, respectively, from only 200 and 170 nm/RIU for the same grating structure inscribed in standard telecom fiber with 62.5-mu m cladding radius. Although the temperature sensitivity has also increased, the change in temperature sensitivity is still insignificant in comparison with RI sensitivity enhancement.