Overcoming non-local effects and Brillouin threshold limitations in Brillouin optical time domain sensors
Fecha
2015Autor
Versión
Acceso abierto / Sarbide irekia
Tipo
Artículo / Artikulua
Versión
Versión aceptada / Onetsi den bertsioa
Impacto
|
10.1109/JPHOT.2015.2498543
Resumen
We demonstrate, for the first time to our knowledge, a Brillouin optical time domain analysis
(BOTDA) sensor that is able to operate with a probe power larger than the Brillouin threshold of the
deployed sensing fiber and that is free from detrimental non-local effects. The technique is based
on a dual-probe-sideband setup in which an optical frequency modulation of the probe waves along
the ...
[++]
We demonstrate, for the first time to our knowledge, a Brillouin optical time domain analysis
(BOTDA) sensor that is able to operate with a probe power larger than the Brillouin threshold of the
deployed sensing fiber and that is free from detrimental non-local effects. The technique is based
on a dual-probe-sideband setup in which an optical frequency modulation of the probe waves along
the fiber is introduced. This makes the optical frequency of the Brillouin interactions induced by each
probe wave on the pump to vary along the fiber so that two broadband Brillouin gain and loss spectra
that perfectly compensate are created. As a consequence, the pulse spectral components remain
undistorted avoiding non-local effects. Therefore, a very large probe power can be injected, which
improves the signal-to-noise ratio in detection for long-range BOTDA. Moreover, the probe power can
even exceed the Brillouin threshold limit due to their frequency modulation, which reduces the effective
amplification of spontaneous Brillouin scattering in the fiber. Experiments demonstrate the technique
in a 50-km sensing link in which 8 dBm of probe power is injected. [--]
Materias
Brillouin distributed sensors,
Brillouin optical time domain analysis,
Non-local effects,
Brillouin threshold,
Optical fiber sensors,
Stimulated Brillouin scattering
Editor
IEEE
Publicado en
IEEE Photonics Journal, Volume 7, Issue 6, Dec. 2015
Departamento
Universidad Pública de Navarra. Departamento de Ingeniería Eléctrica y Electrónica /
Nafarroako Unibertsitate Publikoa. Ingeniaritza Elektrikoa eta Elektronikoa Saila
Versión del editor
Entidades Financiadoras
This work was
supported by the Universidad Pública de Navarra, by the Universidad de Cantabria, and by the
Spanish Ministerio de Ciencia e Innovación through project TEC2013-47264-C2 and Feder funds.
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