Optical-frequency-comb stabilised lasers for interrogation of fibre-resonator strain sensors

Year: 2009

Authors: Gagliardi G., Salza M., Ferraro P., De Natale P.

Autors Affiliation: CNR, Istituto Nazionale di Ottica Applicata (INOA), Compl. A. Olivetti, via Campi Flegrei 34, 80078 Pozzuoli (Naples), Italy

Abstract: Quasi-static and dynamic strain sensing is performed by means of a fibre Bragg-grating resonator based on an optical-frequency-comb stabilised laser. The comb synthesizer, centred around 1560 nm, is a fs-pulsed fibre laser, which is phase-locked to an ultra-stable quartz oscillator, serving as an optical reference to minimise laser-frequency and phase noise both in the long and short-term operation. Detection limits in the order of a few pεRMS/√Hz, in the Hz and sub-Hz range, are demonstrated, while a sub- pε sensitivity is expected at higher frequencies in the acoustic range. © 2009 SPIE.


Volume: 7503      Pages from: 75033N  to: 75033N

More Information: ISSN: 0277786X
ISBN: 978-081947814-6
DOI: 10.1117/12.835199
KeyWords: Bragg gratings; Fiber Bragg gratings; static strain