Theoretical Analysis of Slow-light in π-phase-shifted fiber Bragg grating for sensing applications

2019 Conference on Microwave Techniques (COMITE) Pub Date : 2019-04-01 DOI:10.1109/COMITE.2019.8733540

Krishna Mohan Dwivedi, G. Trivedi, T. Osuch, Karel Juryca, J. Pidanic

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引用次数: 2

Abstract

In this paper, a theoretical analysis of slow-light in π-phase-shifted fiber Bragg grating (π-FBG) for sensing applications has been presented. The coupled-mode theory (CMT) and transfer matrix method (TMM) have been used to establish the numerical modeling of slow-light in π-FBG. The influence of slow-light grating parameters, such as grating length (L), index change (δn), and loss coefficient (α), on the spectral and on the sensing characteristics of π-FBG are studied in detail. The simulation results show that for the maximum slow-light sensitivity the optimum grating parameters are obtained as L = 5 mm, δn = 1×10−3 and α = 0.10 m−1. The peak transmissivity of 0.55 and a remarkable group-index of 1477 is obtained from the optimized grating. The optimized π-FBG is used for slow-light sensing applications. The highest values of slow-light strain and temperature sensitivity of 8.431 µϵ−1 and 91.6435°C−1, respectively are achieved. The slow-light sensitivity of proposed π-FBG is the highest as compared to apodized FBGs reported in the literature. Therefore, the proposed slow-light π-FBG shows great importance in sensing applications.

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传感用π相移光纤光栅慢光的理论分析

本文对传感用π相移光纤布拉格光栅中的慢光进行了理论分析。利用耦合模理论(CMT)和传输矩阵法(TMM)建立了π型光纤光栅中慢光的数值模拟。详细研究了慢光光栅参数，如光栅长度(L)、折射率变化(δn)和损耗系数(α)对π-FBG光谱和传感特性的影响。仿真结果表明，获得最大慢光灵敏度的最佳光栅参数为L = 5 mm， δn = 1×10−3，α = 0.10 m−1。优化后的光栅峰值透过率为0.55，群指数为1477。优化后的π-FBG用于慢光传感应用。慢光应变和温度灵敏度的最大值分别为8.431µε−1和91.6435°C−1。本文提出的π-FBG与文献报道的apodized fbg相比具有最高的慢光灵敏度。因此，所提出的慢光π-FBG在传感应用中具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 Conference on Microwave Techniques (COMITE)

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