Fiber Bragg grating laser sensor with direct radio-frequency readout

Year: 2016

Authors: Malara P., Campanella C. E., Giorgini A., Avino S., Gagliardi G.

Autors Affiliation: Consiglio Nazionale Delle Ricerche, Istituto Nazionale di Ottica (INO), via Campi Flegrei, 34-Comprensorio A. Olivetti, Pozzuoli (Naples), 80078, Italy; QOpSys S.r.l.s., via Matteotti, 23, Gioia del Colle, Bari, Italy

Abstract: A fiber Bragg grating (FBG)-coupled ring laser sensor is demonstrated. In the proposed configuration the interrogating source, the sensing head and the readout instrument are integrated in a single fiber-optic device. An FBG inserted within a bidirectional fiber ring couples the two counterpropagating modes of the cavity, generating a splitting of the resonant wavelengths proportional to the FBG reflectivity. When the cavity gain is brought beyond threshold, the two peaks of the split resonances simultaneously lase, leading to a beat note in the emission spectrum whose frequency tracks any small shift of the FBG reflectivity spectrum. Such a beat note can be simply monitored by a frequency counter, without the need for an optical spectrometer, allowing to significantly reduce size and costs of the sensor setup. The sensing performance compares well to the state-of-the-art thermomechanical fiber sensors. (C) 2016 Optical Society of America

Journal/Review: OPTICS LETTERS

Volume: 41 (7)      Pages from: 1420  to: 1422

More Information: Italian Ministry of education and Research (PON01_01209).
KeyWords: Bragg gratings; Emission spectroscopy; Fibers; Reflection; Ring lasers, Bidirectional fibers; Counterpropagating; Emission spectrums; Frequency counters; Optical spectrometers; Reflectivity spectra; Resonant wavelengths; Sensing performance; Fiber Bragg gratings
DOI: 10.1364/OL.41.001420

Citations: 13
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