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Proceedings Paper

Low-noise wavelength-locked Brillouin ring laser for Brillouin sensing
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Paper Abstract

In this work, we present an enhanced design for a Brillouin Ring Laser (BRL) based on a doubly-resonant cavity (DRC) with short fiber length, paired with a heterodyne-based wavelength-locking system, to be employed as pump-probe source in Brillouin sensing applications. The enhanced source is compared with the long-cavity (LC) (~ 2 km) BRL pump-probe source that we recently demonstrated, showing a significantly lower relative intensity noise (~ -145 dB/Hz in the 0-800 MHz range), a narrower linewidth (10 kHz), combined with large tunability features and an excellent pumpprobe frequency stability (~200 Hz) which is uncommon for fiber lasers. The measurement of intensity noise on the novel BRL signal yielded an improved signal-to-noise ratio (SNR) of about 22 dB with respect to LC-BRL schemes that is expected to lead to a temperature/strain resolution enhancement in BOTDA applications up to 5.5 dB.

Paper Details

Date Published: 28 August 2019
PDF: 4 pages
Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 1119924 (28 August 2019); doi: 10.1117/12.2540111
Show Author Affiliations
Diego Marini, Consiglio Nazionale delle Ricerche (Italy)
Leonardo Rossi, Consiglio Nazionale delle Ricerche (Italy)
Univ. de Bologna (Italy)
Filippo Bastianini, Sestosensor s.r.l. (Italy)
Gabriele Bolognini, Consiglio Nazionale delle Ricerche (Italy)

Published in SPIE Proceedings Vol. 11199:
Seventh European Workshop on Optical Fibre Sensors
Kyriacos Kalli; Sinead O. O'Keeffe; Gilberto Brambilla, Editor(s)

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