%0 Journal Article 
%A López Gil, Alexia Inés
%A Soto Hernández, Marcelo Alfonso
%A Angulo Vinuesa, Xabier
%A Domínguez López, Alejandro
%A Martín López, Sonia
%A Thévenaz, Luc
%A González Herráez, Miguel
%T Evaluation of the accuracy of BOTDA systems based on the phase spectral response
%D 2016
%@ 1094-4087
%U http://hdl.handle.net/10017/26237
%X We evaluate the Brillouin frequency shift (BFS) determination error when utilizing
the Brillouin phase spectrum (BPS) instead of the Brillouin gain spectrum (BGS) in BOTDA
systems. Systems based on the BPS perform the determination of the BFS through a linear fit
around the zero de-phase frequency region. An analytical expression of the error obtained in
the BFS determination as a function of the different experimental parameters is provided and
experimentally validated. The experimental results show a good agreement with the
theoretical predictions as a function of the number of sampling points, signal-to-noise ratio
(SNR) and Brillouin spectral linewidth. For an equal SNR and linewidth, the phase response
only provides a better BFS estimation than the gain response when the fit is performed over a
restricted frequency range around the center of the spectral profile. This may reduce the
measurement time of specific BOTDA systems requiring a narrow frequency scanning. When
the frequency scan covers most of the Brillouin spectral profile, gain and phase responses
give very similar estimations of the BFS and the BPS offers no crucial benefit.
%K Fiber optics
%K Fiber optics sensors
%K Scattering
%K stimulated Brillouin
%K Nonlinear optics
%K fibers
%K Ciencias tecnológicas
%K Electrónica
%K Technology
%K Electronics
%~ Biblioteca Universidad de Alcala