Scientific Results

Sensitive strain measurements with a fiber Bragg-grating ring resonator

Year: 2014

Authors: Malara P., Campanella C. E., Giorgini A., Avino S., Zullo R., Gagliardi G., De Natale P.

Autors Affiliation: Consiglio Nazionale Delle Ricerche, Istituto Nazionale di Ottica (INO), via Campi Flegrei, 34 – Comprensorio A. Olivetti, 80078 Pozzuoli (Naples), Italy; Dipartimento di Elettrotecnica Ed Elettronica, Politecnico di Bari, Via Edoardo Orabona 4, 70125 Bari, Italy

Abstract: We describe a novel strain sensor based on a fiber Bragg grating (FBG) ring resonator. The spectrum of this resonator consists of equally-spaced resonances, exhibiting a frequency splitting proportional to the reflectivity of the intracavity FBG. A strain applied to the FBG causes a shift of the bragg wavelength, and thus a variation of the resonance splitting. The splitting is insensitive to the thermal/strain noise affecting the fiber in the region outside the FBG. The sensitivity and resolution of the sensor are analyzed in detail, showing that a subpicostrain resolution can be easily achieved with an optimized setup.

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KeyWords: Optical resonators; Sensors, Bragg wavelength; Frequency splittings; Intracavities; Novel strains; Ring resonator; Fiber Bragg gratings
DOI: 10.1117/12.2059641

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English