2 July 2007 Effects of thickness and external refractive index in coated tilted fiber Bragg gratings
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Proceedings Volume 6619, Third European Workshop on Optical Fibre Sensors; 66192X (2007) https://doi.org/10.1117/12.738558
Event: Third European Workshop on Optical Fibre Sensors, 2007, Napoli, Italy
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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
D. Paladino, D. Paladino, P. Pilla, P. Pilla, A. Cutolo, A. Cutolo, S. Campopiano, S. Campopiano, M. Giordano, M. Giordano, A. Cusano, A. Cusano, C. Caucheteur, C. Caucheteur, P. Mégret, P. Mégret, } "Effects of thickness and external refractive index in coated tilted fiber Bragg gratings", Proc. SPIE 6619, Third European Workshop on Optical Fibre Sensors, 66192X (2 July 2007); doi: 10.1117/12.738558; https://doi.org/10.1117/12.738558
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