Interrogation of fiber Bragg-grating resonators by polarization-spectroscopy laser-frequency locking

Year: 2007

Authors: Gagliardi G., De Nicola S., Ferraro P., De Natale P.

Autors Affiliation: CNR – Istituto Nazionale di Ottica Applicata and European Laboratory for Non-Linear Spectroscopy (LENS), Comprensorio “A. Olivetti”, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy;
CNR – Istituto di Cibernetica “E. Caianiello”, Comprensorio “A. Olivetti”, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy

Abstract: We report on an optically-based technique that provides an efficient way to track static and dynamic strain by locking the frequency of a diode laser to a fiber Bragg-grating Fabry-Perot cavity. For this purpose, a suitable optical frequency discriminator is generated exploiting the fiber natural birefringence and that resulting from the gratings inscription process. In our scheme, a polarization analyzer detects dispersive-shaped signals centered on the cavity resonances without need for additional optical elements in the resonator or any laser-modulation technique. This method prevents degradation of the resonator quality and maintains the configuration relatively simple, demonstrating static and dynamic mechanical sensing below the picostrain level.

Journal/Review: OPTICS EXPRESS

Volume: 15 (7)      Pages from: 3715  to: 3728

KeyWords: Birefringence; Cavity resonators; Fiber Bragg gratings; Light modulation; Light polarization; Semiconductor lasers, Laser frequency locking; Mechanical sensing; Optical frequency discriminators; Polarization analyzers, Optical resonators
DOI: 10.1364/OE.15.003715

Citations: 22
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