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In this work, an ultra compact in line fiber optic Fabry-Perot interferometer is presented. The interferometric structure consists of a thin (< 1 μm) amorphous silicon layer in line integrated into a standard single mode optical fiber by means of an electric arc discharge technique. The device exhibits low loss (1.46 dB) and high interference fringe visibility (~ 30% in linear scale) both in reflection and transmission due to the high refractive index contrast between silica and α-Si. A high linear temperature sensitivity up to 75 pm/°C is demonstrated in the range 15-52 °C. The proposed device is simple, compact, cost effective and attractive for point monitoring sensing application in ultra-high temperature sensing in harsh environments.
International Society for Optics and Photonics
Publication date: 
20 May 2013

A Micco, G Quero, A Crescitelli, A Ricciardi, A Cusano

Biblio References: 
Volume: 8794 Pages: 87940P
Fifth European Workshop on Optical Fibre Sensors