Fiber In-Line Mach–Zehnder Interferometer Embedded in FBG for Simultaneous Refractive Index and Temperature Measurement

Author

Liao, C.R. ; Wang, Ying ; Wang, D.N. ; Yang, M.W.

Author_Institution

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

Volume

22

Issue

22

fYear

2010

Firstpage

1686

Lastpage

1688

Abstract

An ultracompact optical fiber sensor based on a Mach-Zehnder interferometer (MZI) embedded in fiber Bragg grating (FBG) is proposed and experimentally demonstrated for simultaneous refractive index (RI) and temperature measurement. By use of the resonant wavelength of the FBG and the interference dip of the MZI, the RI and temperature of the surrounding medium can be unambiguously determined. The interesting properties of the sensor include good operation linearity, extremely high RI sensitivity up to ~ -9148 nm/RI unit in the RI range between 1.30 and 1.325, and precise sensing location, determined by the MZI cavity created.

Keywords

Bragg gratings; Mach-Zehnder interferometers; fibre optic sensors; refractive index measurement; temperature measurement; MZI cavity; fiber Bragg grating; fiber in-line Mach-Zehnder interferometer; refractive index measurement; resonant wavelength; temperature measurement; ultracompact optical fiber sensor; Fiber gratings; Fiber lasers; Optical fiber sensors; Optical fibers; Temperature measurement; Temperature sensors; Femtosecond laser micromachining; fiber sensors; interferometer;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2010.2079924

Filename

5585711