Title :
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
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;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2079924
