High resolution temperature sensor based on frequency beating between twin DFB fiber lasers | Zendy

Laurent Dusablon | Zendy; Vincent Fortin | Zendy; Tommy Boilard | Zendy; Martin Bernier | Zendy; Pierre Galarneau | Zendy; François Babin | Zendy; Réal Vallée | Zendy

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High resolution temperature sensor based on frequency beating between twin DFB fiber lasers

Author(s) -

Laurent Dusablon,

Vincent Fortin,

Tommy Boilard,

Martin Bernier,

Pierre Galarneau,

François 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.

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