Novel NCF-FBG Interferometer for Simultaneous Measurement of Refractive Index and Temperature

Author

Li, Lecheng ; Xia, Li ; Wuang, Yuanwu ; Ran, Yanli ; Yang, Chengliang ; Liu, Deming

Author_Institution

Wuhan National Laboratory for Optoelectronics, College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan, China

Volume

24

Issue

24

fYear

2012

Firstpage

2268

Lastpage

2271

Abstract

A simple and compact interferometer structure based on no-core fiber (NCF) and fiber Bragg grating (FBG) is proposed for simultaneous measurement of surrounding refractive index (SRI) and temperature. Two methods of measurement may be used here: 1) the sensing information can be analyzed by the wavelengths shift of the NCF-based interferometer and one arbitrarily FBG-reflected modes, or 2) they can be solely extracted through both wavelength and power of each FBG reflected mode. Moreover, experimental results indicate that the SRI sensitivity of the FBG reflected core mode is up to 160.23 dB/RIU at a range from 1.3330 to 1.3780, which is the highest value to our knowledge.

Keywords

Bragg gratings; Fiber gratings; Optical fiber sensors; Refractive index; Temperature measurement; Temperature sensors; Fiber Bragg grating (FBG); no-core fiber (NCF); refractive index measurement;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2012.2226876

Filename

6359755