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Proceedings Paper

Measurement of temperature profile in fiber Bragg gratings using whispering gallery modes
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Paper Abstract

We present the measurement of the temperature variation along a fiber Bragg grating (FBG) written in a photosensitive fiber, using azimuthal whispering gallery modes (WGM) resonances of the fiber itself. The FBG is regarded as a cylindrical microresonator, in which the azimuthal WGM resonances are excited with an auxiliary 2 μm taper. The wavelengths of the WGM resonances shift as the temperature of the grating increases at a given point. The temperature profile along the FBG is obtained by monitoring the WGM resonances at different points, as a function of the power and wavelength of the optical signal. Our experiments give useful information to study the small absorption changes produces by the standard UV photo-inscription technique and the thermally induced chirping effects generated when FBGs are used with moderate power levels.

Paper Details

Date Published: 2 June 2014
PDF: 4 pages
Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91578B (2 June 2014); doi: 10.1117/12.2059559
Show Author Affiliations
M. Delgado-Pinar, Univ. de València (Spain)
I. L. Villegas, Univ. de València (Spain)
A. Díez, Univ. de València (Spain)
J. L. Cruz, Univ. de València (Spain)
M. V. Andrés, Univ. de València (Spain)

Published in SPIE Proceedings Vol. 9157:
23rd International Conference on Optical Fibre Sensors
José M. López-Higuera; Julian D. C. Jones; Manuel López-Amo; José Luis Santos, Editor(s)

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