Scientific Results

Enhanced spectral response of pi-phase shifted fiber Bragg gratings in closed-loop configuration

Year: 2015

Authors: Malara P., Campanella C. E., De Leonardis F., Giorgini A., Avino S., Passaro V.M.N., Gagliardi G.

Autors Affiliation: Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), via Campi Flegrei, 34-Comprensorio A. Olivetti, Pozzuoli (Naples), 80078, Italy; Dipartimento di Ingegneria Elettrica e dell

Abstract: The transmission spectrum of a ring resonator enclosing a pi-phase shifted fiber Bragg grating (pi-FBG) shows a spectral feature at the Bragg wavelength that is much sharper than resonance of the pi-FBG alone, and that can be detected with a simple integrated cavity output technique. Hence, the resolution of any sensor based on the fitting of the pi-FBG spectral profile can be largely improved by the proposed configuration at no additional fabrication costs and without altering the sensor robustness. A theoretical model shows that the resolution enhancement attainable in the proposed closed-loop geometry depends on the quality factor of the ring resonator. With a commercial grating in a medium-finesse ring, a spectral feature 12 times sharper than the pi-FBG resonance is experimentally demonstrated. A larger enhancement is expected in a low-loss, polarization maintaining setup. (C) 2015 Optical Society of America

Journal/Review: OPTICS LETTERS

Volume: 40 (9)      Pages from: 2124  to: 2126

More Information: This work was funded by the Italian Ministry of Education and Research in the framework of PON01_01209 “BACKOP” project.
KeyWords: Bragg gratings; Optical resonators; Phase shift; Phase shifters; Resonators, Closed loop configuration; Phase shifted fiber bragg grating (PSFBG); Polarization maintaining; Resolution enhancement; Spectral feature; Spectral response; Theoretical modeling; Transmission spectrums; Fiber Bragg gratings
DOI: 10.1364/OL.40.002124

Citations: 6
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