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Fiber Bragg Gratings (FBG) sensors are a very promising solution for strain and/or temperature monitoring in hostile or hazardous environments. In particular, their typical immunity to EMI and the absence of electrical signals and cables, encourage the use of FBG sensors in aerospace structure. Moreover, FBG sensors can be embedded in composite materials, allowing the fabrication of the so-called smart-materials. In this paper we experimentally demonstrate that a Fabry-Perot cavity, integrated in a low-loss all-silicon rib waveguide, and realized by standard dry etching technique, is suitable for FBG monitoring. The reflected signal for the sensor passes through the cavity which is tuned by means of thermo-optic effect. The optical circuit ends with a photodetector that, for each tuning step, produces a photocurrent proportional to the convolution integral between the FBG and the FP spectral response. Because the …
International Society for Optics and Photonics
Publication date: 
7 Mar 2005

Giuseppe Coppola, Mario Iodice, Nunzia Saffioti, Rocco Cristian Zaccuri, Maurizio Indolfi, Ivo Rendina, Alessandra Rocco, Pietro Ferraro

Biblio References: 
Volume: 5730 Pages: 234-241
Optoelectronic Integration on Silicon II