Bragg fibre for sensing applications

O. Frazão; J. M. Baptista; J. L. Santos; P. Roy; R. Jamier; S. Février

doi:10.1117/12.854391

14 May 2010 Bragg fibre for sensing applications

O. Frazão, J. M. Baptista, J. L. Santos, P. Roy, R. Jamier, S. Février

Proceedings Volume 7714, Photonic Crystal Fibers IV; 771402 (2010) https://doi.org/10.1117/12.854391
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

Abstract

In this work, we propose to take advantage of properties of a Bragg fibre for optical sensing. The Bragg fibre exhibits three concentric high refractive index layers embedded in pure silica and surrounding a 35μm diameter core. A short (0.3 m long) piece of Bragg fibre slightly multimode, is used to elaborate an intermodal interferometer, the spectral response of which exhibits a fringe pattern that depends on the operating wavelength, which can therefore be used as a sensor. The two modes considered were found to be the fundamental LP01 and the high-order mode LP02. The sensor has been characterized in strain and temperature and presents a sensitivity of - 1.09 pm/με and 14.1 pm/°C respectively. The sensor demonstrated insensitivity to curvature thanks to well known Bragg fibre properties.

Citation Download Citation

O. Frazão, J. M. Baptista, J. L. Santos, P. Roy, R. Jamier, and S. Février "Bragg fibre for sensing applications", Proc. SPIE 7714, Photonic Crystal Fibers IV, 771402 (14 May 2010); https://doi.org/10.1117/12.854391

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