纤芯失配的光纤Mach-Zehnder折射率传感器

傅海威; 闫旭; 邵敏; 李辉栋; 赵娜

doi:10.3788/OPE.20142209.2285

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纤芯失配的光纤Mach-Zehnder折射率传感器

现代应用光学 | 更新时间：2020-08-13

- 纤芯失配的光纤Mach-Zehnder折射率传感器
- Optical fiber core-mismatched Mach-Zehnder refractive sensor
- 光学精密工程 2014年22卷第9期页码：2285-2291
- 作者机构：
  
  1. 西安石油大学理学院光电油气测井与检测教育部重点实验室,陕西西安,710065
  2. 西北大学物理系,陕西西安,710069
- 作者简介：
- 基金信息：
  
  国家自然科学基金资助项目（No.61275088，No.61077060）();国家863高技术研究发展计划资助项目（No.2009AA06Z203）();陕西省教育厅
- DOI：10.3788/OPE.20142209.2285
  中图分类号： TN253
- 收稿日期：2014-02-24，
  
  修回日期：2014-04-03，
  
  纸质出版日期：2014-09-25
- 稿件说明：
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傅海威, 闫旭, 邵敏等. 纤芯失配的光纤Mach-Zehnder折射率传感器[J]. 光学精密工程, 2014,22(9): 2285-2291

FU Hai-wei, YAN Xu, SHAO Min etc. Optical fiber core-mismatched Mach-Zehnder refractive sensor[J]. Editorial Office of Optics and Precision Engineering, 2014,22(9): 2285-2291
傅海威, 闫旭, 邵敏等. 纤芯失配的光纤Mach-Zehnder折射率传感器[J]. 光学精密工程, 2014,22(9): 2285-2291 DOI： 10.3788/OPE.20142209.2285.

FU Hai-wei, YAN Xu, SHAO Min etc. Optical fiber core-mismatched Mach-Zehnder refractive sensor[J]. Editorial Office of Optics and Precision Engineering, 2014,22(9): 2285-2291 DOI： 10.3788/OPE.20142209.2285.

摘要

基于Mach-Zehnder干涉仪原理，利用光纤错位熔接技术设计并制作了一种单模光纤-多模光纤-单模光纤-错位熔接点-单模光纤结构的液体折射率传感器。传感器中的多模光纤和错位连接部分充当光耦合器；多模光纤在后面的单模光纤的纤芯和包层中激发出纤芯模和包层模，不同的模式有不同的模式折射率，经中间单模光纤传输到错位熔接点处时，不同模式光之间将产生光程差，经错位熔接点耦合成为导出光纤的纤芯模从而产生干涉。对该传感器输出的干涉光谱中干涉谷功率随外界溶液折射率变化的规律进行了理论分析和实验研究。结果表明：溶液折射率变化为1.358 9~1.392 2时，干涉谱中1 530 nm附近的干涉谷光功率与溶液折射率呈单调递增关系，可用于折射率的测量；折射率变化为1.372 0~1.392 2时，传感器响应曲线具有很好的线性度，线性拟合系数为0.998，对应的灵敏度为252.06 dB/RIU。该传感器制作简单、结构紧凑、成本低、灵敏度高，可用于生物医学领域液体折射率的实时测量。

Abstract

According to the principle of Mach-Zehnder interferometers

an optical in-fiber Mach-Zehnder sensor for Surrounding Refractive Index (SRI) is designed and prepared based on single mode fiber/multimode fiber/single mode fiber/misallied fusion spliced point/single mode fiber structures by misallied fusion spliced technology. The multimode fiber and misallied fusion spliced point in this sensor are served as optical couplers. The light from leading in single mode fiber is coupled into a core mode and cladding modes and propagates in the fiber. Because different modes have different effective refractive indices when the light reaches the misallied fusion spliced point

different modes have different optical path lengths

and the intermodal interference will occur. The dip power of the transmission spectral response to the SRI is theoretically analyzed and experimentally studied. The experimental results show that the dip power at wavelength of 1 530 nm increases monotonically with the SRI in a Refractive Index(RI) range of 1.372 0-1.392 2. Moreover

the response curve of the sensor achieves a good linearity of 0.998 at the RI range of 1.372 0-1.392 2

which is corresponding to a high sensitivity of 252.06 dB/RIU.This compact size

low-cost and highly sensitive SRI sensor is easy to be fabricated

and offers attractive applications in biomedical sensing.

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Keywords

references

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