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Novel refractive index sensor based on fiber bragg grating in nano-bore optical fiber

机译：纳米光纤中基于光纤布拉格光栅的新型折射率传感器

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摘要

In this paper, we propose a novel refractive index sensor with large dynamic range based on fiber Bragg grating in the nano-bore optical fiber. The spectral responses of grating on the filling index in the bore with different bore diameters and index ranges are numerically studied by the finite element method and coupled mode theory based transmission matrix method. It is found that the Bragg wavelength of grating is sensitive to the filling index in the bore. The influences of bore diameter on the wavelength sensitivity, resolution and dynamic range of the index sensor are analyzed. There exists a trade off between the linear dynamic range and sensitivity of index when the bore diameter varies. The optimized wavelength sensitivity and resolution of filling index are 53.6923nm/index unit and 9.3123x10(-6) index under a linear index range of 1.0-1.4 using 2 mu m bore diameter. The optimized linear dynamic range of index is 1.0-1.48 with wavelength sensitivity of 13.3056nm/index unit and resolution of 3.7578x10(-5) index using 1 mu m bore diameter. Our proposed index sensor has the technical advantages of simple all-fiber structure, large index range, and potential capability to synchronously detect index, temperature and strain.
机译：在本文中，我们基于纳米孔光纤中的布拉格光栅，提出了一种具有大动态范围的新型折射率传感器。利用有限元法和基于耦合模理论的透射矩阵法，对光栅对不同孔径和折射率范围的孔内填充指数的光谱响应进行了数值研究。发现光栅的布拉格波长对孔中的填充指数敏感。分析了孔径对折射率传感器的波长灵敏度，分辨率和动态范围的影响。孔径变化时，线性动态范围和折射率灵敏度之间需要权衡。在使用2微米孔径的线性折射率范围为1.0-1.4的情况下，优化的波长灵敏度和填充指数的分辨率为53.6923nm /指数单位和9.3123x10（-6）指数。折射率的最佳线性动态范围是1.0-1.48，波长灵敏度为13.3056nm /折射率单位，使用1毫米孔径的分辨率为3.7578x10（-5）折射率。我们提出的折射率传感器具有简单的全纤维结构，较大的折射率范围以及同步检测折射率，温度和应变的潜在能力的技术优势。

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