Improvement in refractive index sensitivity by means of internally curved long period fiber gratings

F. Chiavaioli; C. Trono; F. Baldini

doi:10.1117/12.2059691

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2 June 2014 Improvement in refractive index sensitivity by means of internally curved long period fiber gratings

F. Chiavaioli, C. Trono, F. Baldini

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Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91578P (2014) https://doi.org/10.1117/12.2059691
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

A novel configuration of long period fiber grating (LPFG), based on a specially designed refractive index (RI) profile, was manufactured and studied. The internally manufactured geometric structure is characterized by grating planes tilted at increasing angles, as moving away from the center of symmetry of the structure towards its both edges. This structure reproduces the bending of an optical fiber and improves the RI sensitivity of an LPG to the external surrounding medium. A three-fold enhancement in the RI sensitivity was experimentally proved, thus giving a further contribution towards the development of more sensitive RI sensors based on optical fiber LPGs.

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F. Chiavaioli, C. Trono, and F. Baldini "Improvement in refractive index sensitivity by means of internally curved long period fiber gratings", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91578P (2 June 2014); https://doi.org/10.1117/12.2059691

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