Refractive index sensor with asymmetrical fiber Mach-Zehnder interferometer based on concatenating single-mode abrupt taper and core-offset section

被引：74

作者：

Yin, Guolu ^{[1
]}

Lou, Shuqin ^{[1
]}

Zou, Hui ^{[1
]}

机构：

[1] Beijing Jiaotong Univ, Sch Elect & Informat Engn, Beijing 100044, Peoples R China

来源：

OPTICS AND LASER TECHNOLOGY | 2013年 / 45卷

基金：

中国国家自然科学基金; 北京市自然科学基金;

关键词：

Fiber taper; Core-offset section; Refractive index sensor; OPTICAL-FIBER; HIGH-SENSITIVITY; GRATINGS;

D O I：

10.1016/j.optlastec.2012.06.032

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A novel refractive index (RI) sensor based on an asymmetrical fiber Mach-Zehnder interferometer (AFMZI) was realized by concatenating single-mode abrupt taper and core-off section. Compared with the normal two-taper MZI, the proposed sensor enlarges the evanescent field in the surrounding medium through the core-offset section. As a result, the RI sensitivity to the surrounding medium can be improved. Experimental results show that the RI sensitivity of the proposed sensor is 28.2 nm/RIU (refractive index unit) and 59.2 nm/RIU for interferometer length of 30 mm and 50 mm, respectively. It is much higher than the RI sensitivity of the normal two-taper MZI which is 14.7 nm/RIU and 19.1 nm/RIU for the corresponding interferometer length. Such kinds of low cost and highly sensitive RI sensor would find application in chemical and biological sensing fields. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：294 / 300

页数：7

共 25 条

[1] Optical fiber long-period grating sensors [J].

Bhatia, V ;

Vengsarkar, AM .

OPTICS LETTERS, 1996, 21 (09) :692-694

[2] Tapered Mach-Zehnder interferometer based on two mechanically induced long-period fiber gratings as refractive index sensor [J].

Cardenas-Sevilla, G. A. ;

Monzon-Hernandez, D. ;

Torres-Gomez, I. ;

Martinez-Rios, A. .

OPTICS AND LASER TECHNOLOGY, 2012, 44 (05) :1516-1520

[3] Demodulation technique for weakly tilted fiber Bragg grating refractometer [J].

Caucheteur, C ;

Mégret, P .

IEEE PHOTONICS TECHNOLOGY LETTERS, 2005, 17 (12) :2703-2705

[4] Analysis of etched long-period fibre grating and its response to external refractive index [J].

Chiang, KS ;

Liu, YQ ;

Ng, MN ;

Dong, XY .

ELECTRONICS LETTERS, 2000, 36 (11) :966-967

[5]

Datta P, 1996, MICROW OPT TECHN LET, V11, P93, DOI 10.1002/(SICI)1098-2760(19960205)11:2<93::AID-MOP14>3.0.CO

[6]

2-8

[7] Fiber-taper seeded long-period grating pair as a highly sensitive refractive-index sensor [J].

Ding, JF ;

Zhang, AP ;

Shao, LY ;

Yan, JH ;

He, SL .

IEEE PHOTONICS TECHNOLOGY LETTERS, 2005, 17 (06) :1247-1249

[8] Wavelength-selective all-fiber filter based on a single long-period fiber grating and a misaligned splicing point [J].

Dong, XY ;

Su, L ;

Shum, P ;

Chung, Y ;

Chan, CC .

OPTICS COMMUNICATIONS, 2006, 258 (02) :159-163

[9] Optical inclinometer based on a single long-period fiber grating combined with a fused taper [J].

Frazao, O. ;

Falate, R. ;

Fabris, J. L. ;

Santos, J. L. ;

Ferreira, L. A. ;

Araujo, F. M. .

OPTICS LETTERS, 2006, 31 (20) :2960-2962

[10] Thinned fiber Bragg gratings as high sensitivity refractive index sensor [J].

Iadicicco, A ;

Cusano, A ;

Cutolo, A ;

Bernini, R ;

Giordano, M .

IEEE PHOTONICS TECHNOLOGY LETTERS, 2004, 16 (04) :1149-1151

← 1 2 3 →