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.
Marini D., Rossi L., Bastianini F., Bolognini G. (2019). Low-noise wavelength-locked Brillouin ring laser for Brillouin sensing. 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA : SPIE [10.1117/12.2540111].
Low-noise wavelength-locked Brillouin ring laser for Brillouin sensing
Marini D.Primo
;Rossi L.Secondo
;
2019
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
