Enhanced spectral response of pi-phase shifted fiber Bragg gratings in closed-loop configuration
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 gratingsDOI: 10.1364/OL.40.002124Citations: 7data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2022-05-22References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here