Simultaneous temperature and refractive index measurements using a 3° slanted multimode fiber Bragg grating

Author

Zhao, Chun-liu ; Yang, Xiufeng ; Demokan, M.S. ; Jin, W.

Author_Institution

Dept. of Electr. Eng., Hong Kong Polytech. Univ., China

Volume

24

Issue

2

fYear

2006

Firstpage

879

Lastpage

883

Abstract

A novel and simple sensor based on a 3° slanted multimode fiber Bragg grating (MFBG) for simultaneous temperature and refractive index measurement is demonstrated. The 3° slanted MFBG shows two wavelength groups in its transmission spectrum: One group, due to the coupling from one core mode to cladding modes, is sensitive to both surrounding refractive index (SRI) and temperature and the other, due to the coupling from one core mode to other core modes is sensitive only to temperature. Utilizing the obvious difference of two transmission dips in different wavelength groups on the temperature and the refractive index, two parameters can be distinguished and measured simultaneously using one slanted MFBG.

Keywords

Bragg gratings; fibre optic sensors; optical fibres; refractive index; refractive index measurement; temperature measurement; mode coupling; refractive index measurement; slanted multimode fiber Bragg grating; surrounding refractive index; temperature measurement; Bragg gratings; Chemical sensors; Couplings; Fiber gratings; Optical fiber sensors; Refractive index; Strain measurement; Temperature measurement; Temperature sensors; Wavelength measurement; Multimode fiber Bragg grating; sensor; simultaneous temperature and refractive index measurement;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2005.862471

Filename

1593760