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

M. Delgado-Pinar; I. L. Villegas; A. Díez; J. L. Cruz; M. V. Andrés

doi:10.1117/12.2059559

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2 June 2014 Measurement of temperature profile in fiber Bragg gratings using whispering gallery modes

M. Delgado-Pinar, I. L. Villegas, A. Díez, J. L. Cruz, M. V. Andrés

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Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91578B (2014) https://doi.org/10.1117/12.2059559
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

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.

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M. Delgado-Pinar, I. L. Villegas, A. Díez, J. L. Cruz, and M. V. Andrés "Measurement of temperature profile in fiber Bragg gratings using whispering gallery modes", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91578B (2 June 2014); https://doi.org/10.1117/12.2059559

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