Open AccessHigh resolution temperature sensor based on frequency beating between twin DFB fiber lasers
Author(s) -
Laurent Dusablon,
Vincent Fortin,
Tommy Boilard,
Martin Bernier,
Pierre Galarneau,
F. Babin,
Réal Vallée
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.395949
Subject(s) - materials science , optics , fiber bragg grating , fiber laser , laser , femtosecond , fiber optic sensor , beat (acoustics) , optical fiber , optoelectronics , polarization maintaining optical fiber , phosfos , single mode optical fiber , wavelength , physics
We present a high resolution temperature sensor using the beat frequency between the longitudinal modes of twin single-mode distributed feedback fiber lasers. The lasers are made by femtosecond inscription of π-shifted fiber Bragg gratings in a thulium-doped fiber. Combining the light from two single frequency fiber lasers on a photodetector produces a rf beat frequency signal which is dependent on temperature. Experimental results show a sensitivity of 1900 MHz/°C, leading to a precision of 0.0007 °C.