RT info:eu-repo/semantics/article
T1 Simple Baseband Method for the Distributed Analysis of Brillouin Phase-Shift Spectra
A1 López Gil, Alexia Inés
A1 Angulo Vinuesa, Xabier
A1 Domínguez López, Alejandro
A1 Martín López, Sonia
A1 González Herráez, Miguel
K1 Brillouin distributed sensors
K1 Brillouin optical time domain analysis
K1 Brillouin scattering
K1 Fiber optics sensor
K1 Interferometry
K1 Nonlinear optics
K1 Temperature sensor
K1 Telecomunicaciones
K1 Telecommunication
AB The phase shift feature of stimulated Brillouin scattering is rarely used for the development of sensors based on the Brillouin optical time-domain analysis (BOTDA). However, this feature shows significant interest for sensing thanks to its linear dependence around the Brillouin frequency shift. Until now, distributed Brillouin phase shift (BPS) measurements required complex modulations, high-bandwidth detection, and sharp filtering. Recently, we introduced the possibility of developing simple distributed measurements of BPS in BOTDA using the baseband technology. The basic idea was the use of a Sagnac interferometer coupled to a conventional BOTDA without filtering and incorporating balanced detection. Although the concept was demonstrated, the setup proposed (using a 2 × 2 optical coupler) had significant shortcomings, the main one being its lack of stability due to the need of setting the interferometer bias through the polarization of the interacting waves. This restricted severely the practicality of the method. In this letter, we propose a setup with enhanced stability thanks to the use of a 3 × 3 optical coupler. With this configuration, the impact of the drifts along the measurement is strongly reduced, and the quality of the measurements improves substantially. The method is theoretically studied and demonstrated experimentally.
PB IEEE
SN 1041-1135
YR 2016
FD 2016-07-01
LK http://hdl.handle.net/10017/26306
UL http://hdl.handle.net/10017/26306
LA eng
NO European Commission
DS MINDS@UW
RD 23-abr-2024