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dc.contributor.authorSoto Hernández, Marcelo Alfonso 
dc.contributor.authorAngulo Vinuesa, Xabier 
dc.contributor.authorMartín López, Sonia 
dc.contributor.authorChin, S.H.
dc.contributor.authorAnia Castañón, Juan Diego
dc.contributor.authorCorredera, Pedro
dc.contributor.authorRochat, Etienne
dc.contributor.authorGonzález Herráez, Miguel 
dc.contributor.authorThévenaz, Luc
dc.identifier.bibliographicCitationSoto, M.A., Angulo-Vinuesa, X., Martin-Lopez, S., Chin, S.-H., Ania-Castañon, J.D., Corredera, P., Rochat, E., Gonzalez-Herraez, M., Thévenaz, L., 2014, " Extending the real remoteness of long-range brillouin optical time-domain fiber analyzers", Journal of Lightwave Technology, 32 (1), art. no. 6678536, pp. 152-162.
dc.description.abstractThe real remoteness of a distributed optical fiber sensor based on Brillouin optical time-domain analysis is considerably extended in this paper using seeded second-order Raman amplification and optical pulse coding. The presented analysis and the experimental results demonstrate that a proper optimization of both methods combined with a well-equalized two-sideband probe wave provide a suitable solution to enhance the signal-to-noise ratio of the measurements when an ultra-long sensing fiber is used. In particular, the implemented system is based on an extended optical fiber length, in which half of the fiber is used for sensing purposes, and the other half is used to carry the optical signals to the most distant sensing point, providing also a long fiber for distributed Raman amplification. Power levels of all signals launched into the fiber are properly optimized in order to avoid nonlinear effects, pump depletion, and especially any power imbalance between the two sidebands of the probe wave. This last issue turns out to be extremely important in ultra-long Brillouin sensing to provide strong robustness of the system against pump depletion. This way, by employing a 240 km-long optical fiber-loop, sensing from the interrogation unit up to a 120 km remote position (i.e., corresponding to the real sensing distance away from the sensor unit) is experimentally demonstrated with a spatial resolution of 5 m. Furthermore, this implementation requires no powered element in the whole 240 km fiber loop, providing considerable advantages in situations where the sensing cable crosses large unmanned areas.en
dc.description.sponsorshipMinisterio de Ciencia e Innovaciónes_ES
dc.description.sponsorshipComunidad de Madrides_ES
dc.description.sponsorshipEuropean Commissionen
dc.subjectDistributed optic fiber sensoren
dc.subjectDistributed Raman amplificationen
dc.subjectOptical pulse codingen
dc.subjectTemperature measurementsen
dc.titleExtending the real remoteness of long-range brillouin optical time-domain fiber analyzersen
dc.subject.ecienciaCiencias tecnológicases_ES
dc.contributor.affiliationUniversidad de Alcalá. Departamento de Electrónicaes_ES
dc.relation.projectIDinfo:eu-repo/grantAgreement/MICINN//TEC2009-14423-C02-01/ES/Aplicacion Del Laser Femto Fibre Comb A La Metrologia De Frecuencias Para Comunicaciones Opticas/en
dc.relation.projectIDinfo:eu-repo/grantAgreement/MICINN//TEC2009-14423-C02-02/ES/Aplicacion Del Laser Femtocomb Al Estudio De Estructuras Semiconductoras Para Comunicaciones Opticas/en
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/FP7/307441/EU/Ubiquitous optical FIbre NErves/U-FINEen

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