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Proceedings Paper

Effects of thickness and external refractive index in coated tilted fiber Bragg gratings
Author(s): D. Paladino; P. Pilla; A. Cutolo; S. Campopiano; M. Giordano; A. Cusano; C. Caucheteur; P. Mégret
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Paper Abstract

In this work, an experimental analysis on the spectral effects induced by depositing a uniform high refractive index (HRI) thin coating on weakly tilted fiber Bragg gratings (TFBGs) is carried out. First, two weakly TFBGs presenting different tilt angles were fabricated. Successively, by using dip-coating technique, two different coating thicknesses were deposited on each of them. The transmission spectra of the obtained structures were collected as the surrounding refractive index (SRI) changed in the range 1÷1.47. The coated gratings present some differences in their spectral evolution, that can be opportunely exploited. The coated configuration could improve some aspects of previous demodulation techniques exploited in the case of bare TFBGs. Moreover, an important effect of HRI coatings is to enhance the SRI sensitivity of the spectral position of the dips corresponding to cladding modes coupling, leading to a different interrogation method for sensing applications.

Paper Details

Date Published: 2 July 2007
PDF: 4 pages
Proc. SPIE 6619, Third European Workshop on Optical Fibre Sensors, 66192X (2 July 2007); doi: 10.1117/12.738558
Show Author Affiliations
D. Paladino, Univ. of Sannio (Italy)
P. Pilla, Univ. of Sannio (Italy)
Institute of Composite and Biomedical Materials, National Research Council (Italy)
A. Cutolo, Univ. of Sannio (Italy)
S. Campopiano, Univ. of Naples Parthenope (Italy)
M. Giordano, Institute of Composite and Biomedical Materials, National Research Council (Italy)
A. Cusano, Univ. of Sannio (Italy)
C. Caucheteur, Faculté Polytechnique de Mons (Belgium)
P. Mégret, Faculté Polytechnique de Mons (Belgium)

Published in SPIE Proceedings Vol. 6619:
Third European Workshop on Optical Fibre Sensors
Antonello Cutolo; Brian Culshaw; José Miguel López-Higuera, Editor(s)

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