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Temperature influence on the cladding mode distribution in highly localized point-by-point fibre Bragg gratings
Author(s): C. Caucheteur; A. Gonzalez-Vila; H. Chikh-Bled; B. Lasri; D. Kinet; K. Chah
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Paper Abstract

An infrared femtosecond pulses laser is used to manufacture point-by-point gratings in telecommunication-grade optical fibres. The refractive index modulations are localized close to the core-cladding interface, yielding a strong coupling to cladding mode resonances together with an important photo-induced birefringence. Such gratings have been recently used for refractrometric measurements. In this work, their transmitted amplitude spectrum is measured with polarized light while they are exposed to temperature changes up to 900 °C. Despite an overall good thermal stability of the gratings that confirms their robustness for high-temperature refractometry, we report an interesting polarization effect depending on both the cladding mode resonance family (radially- and azimuthally-polarized modes) and mode order. While the birefringence of the core mode resonance decreases with the temperature, certain cladding mode resonances show an increase of the wavelength splitting between their orthogonally-polarized components. This differential behaviour can be of high interest to develop high-resolution multiparametric sensing platforms.

Paper Details

Date Published: 30 May 2016
PDF: 4 pages
Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 991629 (30 May 2016); doi: 10.1117/12.2236905
Show Author Affiliations
C. Caucheteur, Univ. de Mons (Belgium)
A. Gonzalez-Vila, Univ. de Mons (Belgium)
H. Chikh-Bled, Univ. of Abou-Bekr Belkaid (Algeria)
B. Lasri, Univ. of Abou-Bekr Belkaid (Algeria)
D. Kinet, Univ. de Mons (Belgium)
K. Chah, Univ. de Mons (Belgium)

Published in SPIE Proceedings Vol. 9916:
Sixth European Workshop on Optical Fibre Sensors
Elfed Lewis, Editor(s)

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