30 May 2016 Temperature influence on the cladding mode distribution in highly localized point-by-point fibre Bragg gratings
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Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 991629 (2016) https://doi.org/10.1117/12.2236905
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland
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.
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C. Caucheteur, A. Gonzalez-Vila, H. Chikh-Bled, B. Lasri, D. Kinet, K. Chah, "Temperature influence on the cladding mode distribution in highly localized point-by-point fibre Bragg gratings", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 991629 (30 May 2016); doi: 10.1117/12.2236905; https://doi.org/10.1117/12.2236905
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