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Proceedings Paper

Actively stabilized low-noise Brillouin fiber ring laser for Brillouin sensing
Author(s): Diego Marini; Leonardo Rossi; Filippo Bastianini; Gabriele Bolognini
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Paper Abstract

In this work we report the results of a theoretical and experimental study that we have carried out on a Brillouin optical time domain analysis (BOTDA) sensing scheme using a novel low-noise actively-stabilized fiber Brillouin ring laser (BRL) as probe source. The BRL laser is based on a short-cavity (SC), < 4 meters long, layout achieving double-resonance (DR) operation for both pump and probe signals; an active wavelength-locking circuit is used to stabilize the signal and tune the signal frequency over a range of ̴ 200 MHz range. The wavelength-locked SC-DR BRL shows spectral linewidth of approximately 10 kHz and RIN values of ~-145 dB/Hz across the (0-600) MHz range; pump-probe frequency shift can be efficiently tuned across the entire Brillouin gain spectrum of the sensing fiber with sub-kHz precision (200 Hz) and high temporal stability for timescale of BOTDA measurements (more than 100 ms). A preliminary BOTDA measurement using a wavelength-locked long-cavity (LC) BRL yielded a Brillouin frequency shift (BFS) uncertainty of 1,5 MHz corresponding to temperature and strain sensitivity values of 1 K and 25 με, respectively, and a spatial resolution of 5 m for 50 ns-long pump pulses.

Paper Details

Date Published: 7 March 2019
PDF: 7 pages
Proc. SPIE 10897, Fiber Lasers XVI: Technology and Systems, 108971U (7 March 2019); doi: 10.1117/12.2510539
Show Author Affiliations
Diego Marini, CNR, Institute for Microelectronics and Microsystems (Italy)
Leonardo Rossi, CNR, Institute for Microelectronics and Microsystems (Italy)
Univ. degli Studi di Bologna (Italy)
Filippo Bastianini, Sestosensor srl (Italy)
Gabriele Bolognini, CNR, Institute for Microelectronics and Microsystems (Italy)

Published in SPIE Proceedings Vol. 10897:
Fiber Lasers XVI: Technology and Systems
Adrian L. Carter; Liang Dong, Editor(s)

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