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基于包层模的光纤布拉格光栅折射率传感特性

Refractive Index Sensing Characteristics of Fiber Bragg Grating Based on Cladding Mod

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摘要

提出了基于光纤布拉格光栅(FBG)包层模式的折射率传感方案。实验中,利用不同浓度的丙三醇水溶液作为外界折射率传感溶液,采用氢氟酸溶液化学腐蚀的方法来减小光纤包层的直径以增大包层模式对外界折射率的敏感度,研究了腐蚀后光纤布拉格光栅包层模式的耦合波长对外部折射率的变化关系。实验结果表明在1.3300~1.4584的折射率范围内,包层模式耦合波长随外界折射率增大而增大,在接近光纤包层折射率处具有很高的折射率灵敏度,最大达到了172 nm/riu (refractive index unit)。而且,包层模谐振的光谱半峰全宽(约0.07 nm)仅为布拉格纤芯模谐振光谱半峰全宽的1/4,能够获得更好的传感精度。

Abstract

A new refractive index sensing scheme based on the cladding modes of fiber Bragg grating (FBG) is presented. In the experiments, glycerin aquatic solutions with different concertrations are used as the external refractive index sensing media, and the cladding diameter of FBG is reduced by etching the fiber with HF solution to enhance the sensitivity of cladding modes to the external refractive index. Dependence of the coupling wavelength of the etched FBG cladding mode on the external refractive index is measured. The results show that in the refractive index range of 1.3300~1.4584, the coupling wavelength of cladding mode shifts longer with the increase of the external refractive index and a higher sensitivity is achieved when the external refractive index is close to that of fiber cladding's, and the maximum refractive index sensitivity reaches 172 nm/riu (refractive index unit). Furthermore, the full-width-at-half-maximum (FWHM) of resonant cladding mode is 0.07 nm, which is about 1/4 of that of the core mode's. With this narrower spectrum, a higher sensing resolution can be achieved.

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中图分类号:TN253

所属栏目:光纤光学与光通信

基金项目:江苏省自然科学基金(BK2004207)和国家杰出青年科学基金(60125513)资助课题。

收稿日期:2005-10-18

修改稿日期:2005-12-12

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作者单位    点击查看

恽斌峰:东南大学电子工程系先进光子学中心, 南京 210096
陈娜:东南大学电子工程系先进光子学中心, 南京 210096
崔一平:东南大学电子工程系先进光子学中心, 南京 210096

联系人作者:恽斌峰(ybf@seu.edu.cn)

备注:恽斌峰(1979~),男,江苏常州人,东南大学电子工程系博士研究生,主要从事光纤光栅的传感应用技术研究

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引用该论文

恽斌峰,陈娜,崔一平.  Refractive Index Sensing Characteristics of Fiber Bragg Grating Based on Cladding Mod[J]. Acta Optica Sinica, 2006, 26(7): 1013-1015

恽斌峰,陈娜,崔一平. 基于包层模的光纤布拉格光栅折射率传感特性[J]. 光学学报, 2006, 26(7): 1013-1015

被引情况

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【2】徐俊娇,李杰,戎华北,石志东,董小鹏. 少模光纤布拉格光栅折射率传感的分析与测量. 光学学报, 2008, 28(3): 565-568

【3】刘为俊,饶云江,冉曾令,廖弦. 基于激光微加工的新型光纤法布里-珀罗折射率传感器. 光学学报, 2008, 28(7): 1400-1404

【4】杨建春,徐龙君,章鹏,陈伟民. 纤芯失配型光纤传感器折射率敏感特性. 光学学报, 2009, 29(5): 1183-1187

【5】周爱,苑立波. 蘸粘式光纤液体分析仪的折射率传感特性研究. 光学学报, 2010, 30(5): 1245-1248

【6】罗彬彬,赵明富,周晓军,黄德翼,曹雪梅. 单端腐蚀光纤布拉格光栅在低折射率区的理论模型及设计. 光学学报, 2011, 31(4): 406004--1

【7】吴浩伟,应朝福,彭保进,徐斐,赵亚辉. 基于薄芯光纤模态干涉技术的折射率传感特性实验研究. 光子学报, 2011, 40(12): 1881-1883

【8】刘颖刚,车伏龙,傅海威,赵娜,邵敏. 光纤布拉格光栅折射率传感研究进展. 光电技术应用, 2015, 30(1): 1-7

【9】高久鹏,黄勇林,陶子盛. 环境折射率的细微变化对TFBG透射光谱的影响. 光通信研究, 2016, 42(6): 50-52

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