%0 Journal Article 
%A Domínguez López, Alejandro
%A Angulo Vinuesa, Xabier
%A López Gil, Alexia Inés
%A Martín López, Sonia
%A González Herráez, Miguel
%T Non-local effects in dual-probe-sideband Brillouin optical time domain analysis
%D 2015
%U http://hdl.handle.net/10017/25077
%X According to recent models, non-local effects in dual-probesideband
Brillouin Optical Time Domain Analysis (BOTDA) systems
should be essentially negligible whenever the probe power is below the
Stimulated Brillouin Scattering (SBS) threshold. This paper shows that
actually there appear non-local effects in this type of systems before the
SBS threshold. To explain these effects it is necessary to take into account a
full spectral description of the SBS process. The pump pulse experiences a
frequency-dependent spectral deformation that affects the readout process
differently in the gain and loss configurations. This paper provides a simple
analytical model of this phenomenon, which is validated against compelling
experimental data, showing good agreement. The main conclusion of our
study is that the measurements in gain configuration are more robust to this
non-local effect than the loss configuration. Experimental and theoretical
results show that, for a total probe wave power of ~1 mW (500 μW on each
sideband), there is an up-shifting of ~1 MHz in the Brillouin Frequency
Shift (BFS) retrieved from the Brillouin Loss Spectrum, whereas the BFS
extracted from the measured Brillouin Gain Spectrum is up-shifted only
~0.6 MHz. These results are of particular interest for manufacturers of longrange
BOTDA systems.
%K Scattering
%K Stimulated Brillouin
%K Scattering, Brillouin
%K Fiber optics sensors
%K Nonlinear optics
%K Fibers
%K Ciencias tecnológicas
%K Electrónica
%K Technology
%K Electronics
%~ Biblioteca Universidad de Alcala