RT info:eu-repo/semantics/article
T1 Non-local effects in dual-probe-sideband Brillouin optical time domain analysis
A1 Domínguez López, Alejandro
A1 Angulo Vinuesa, Xabier
A1 López Gil, Alexia Inés
A1 Martín López, Sonia
A1 González Herráez, Miguel
K1 Scattering
K1 Stimulated Brillouin
K1 Scattering, Brillouin
K1 Fiber optics sensors
K1 Nonlinear optics
K1 Fibers
K1 Ciencias tecnológicas
K1 Electrónica
K1 Technology
K1 Electronics
AB According to recent models, non-local effects in dual-probesidebandBrillouin Optical Time Domain Analysis (BOTDA) systemsshould be essentially negligible whenever the probe power is below theStimulated Brillouin Scattering (SBS) threshold. This paper shows thatactually there appear non-local effects in this type of systems before theSBS threshold. To explain these effects it is necessary to take into account afull spectral description of the SBS process. The pump pulse experiences afrequency-dependent spectral deformation that affects the readout processdifferently in the gain and loss configurations. This paper provides a simpleanalytical model of this phenomenon, which is validated against compellingexperimental data, showing good agreement. The main conclusion of ourstudy is that the measurements in gain configuration are more robust to thisnon-local effect than the loss configuration. Experimental and theoreticalresults show that, for a total probe wave power of ~1 mW (500 μW on eachsideband), there is an up-shifting of ~1 MHz in the Brillouin FrequencyShift (BFS) retrieved from the Brillouin Loss Spectrum, whereas the BFSextracted from the measured Brillouin Gain Spectrum is up-shifted only~0.6 MHz. These results are of particular interest for manufacturers of longrangeBOTDA systems.
PB Optical Society of America
YR 2015
FD 2015-04
LK http://hdl.handle.net/10017/25077
UL http://hdl.handle.net/10017/25077
LA eng
NO European Commission
DS MINDS@UW
RD 20-abr-2024