Thinned fiber Bragg gratings for sensing applications

In this work, we report recent developments on the use of thinned and structured fiber Bragg gratings (FBGs) as in fiber refractometers. Several etched FBG configurations have been proposed for refractive index measurements and for simultaneous temperature referencing, based on Bragg wavelength shift monitoring. Furthermore, advanced configuration based on structured FBGs has been proposed as low cost and high resolution refractive index sensor. Here, theoretical analysis, fabrication techniques and spectral characterizations of the proposed optoelectronic devices are presented.