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dc.creatorMariñelarena Ollacarizqueta, Jones_ES
dc.creatorUrricelqui Polvorinos, Javieres_ES
dc.creatorLoayssa Lara, Alaynes_ES
dc.date.accessioned2016-11-07T14:18:30Z
dc.date.available2016-11-07T14:18:30Z
dc.date.issued2016
dc.identifier.citationJ. Mariñelarena, J. Urricelqui and A. Loayssa, "Gain Dependence of the Phase-Shift Spectra Measured in Coherent Brillouin Optical Time-Domain Analysis Sensors," in Journal of Lightwave Technology, vol. 34, no. 17, pp. 3972-3980, Sept.1, 1 2016. doi: 10.1109/JLT.2016.2593747en
dc.identifier.issn0733-8724
dc.identifier.urihttps://hdl.handle.net/2454/22583
dc.description.abstractWe report on the effects of large pump pulse powers on Brillouin optical time-domain analysis (BOTDA) sensors based on phase-modulated probe wave and coherent self-heterodyne detection. These sensors are particularly suitable to perform dynamic strain and temperature measurements because the radio-frequency (RF) signal that is obtained when the probe wave is detected has a phase-shift spectrum that is independent to first order of the Brillouin gain. Therefore, a fixed optical frequency separation between pump and probe wave can be deployed and uses the stable RF phase-shift spectrum to obtain the Brillouin frequency shift (BFS) from measured changes in the probe RF phase-shift. However, in this paper, it is found that there is a narrowing of the RF phase-shift spectrum that depends on the Brillouin gain. This effect becomes significant when very high power pulses are used and the resultant large gain induces a narrowing of the RF phase-shift spectrum. This narrowing leads to a BFS measurement error when the sensor is configured for dynamic measurements. We analyze, theoretically and experimentally, the origins and the magnitude of the narrowing of RF phase-shift spectra for high pump pulses in a coherent BOTDA sensor. Furthermore, this spectral shape change is compared to the broadening of the gain spectrum that has been recently discovered in conventional direct-detection BOTDA sensors, which is linearly dependent on the pulse peak power injected to the fiber, finding that the spectral shape change is less significant in coherent BOTDA sensors. Finally, we quantify the BFS measurement error that it can induce and find the trade-offs to keep it below a certain threshold. It is found that, from a practical point of view, this effect is significant for short fibers, where nonlinear effects are negligible and large pump pulses can be used.en
dc.description.sponsorshipThis work was supported by the Universidad Publica de Navarra, Feder funds and Spanish Ministerio de Economía y Competitividad through the project TEC2013-47264-C2-2-R.en
dc.format.mimetypeapplication/pdfen
dc.language.isoengen
dc.publisherIEEEen
dc.relation.ispartofJournal of Lightwave Technology, vol. 34, no. 17, September 1, 2016en
dc.rights© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.en
dc.subjectBrillouin optical time-domain analysisen
dc.subjectBrillouin scatteringen
dc.subjectCoherent sensorsen
dc.subjectDynamic sensingen
dc.titleGain dependence of the phase-shift spectra measured in coherent Brillouin optical time-domain analysis sensorsen
dc.typeArtículo / Artikuluaes
dc.typeinfo:eu-repo/semantics/articleen
dc.contributor.departmentUniversidad Pública de Navarra. Departamento de Ingeniería Eléctrica y Electrónicaes_ES
dc.contributor.departmentNafarroako Unibertsitate Publikoa. Ingeniaritza Elektriko eta Elektronikoa Sailaeu
dc.rights.accessRightsAcceso abierto / Sarbide irekiaes
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessen
dc.identifier.doi10.1109/JLT.2016.2593747
dc.relation.projectIDinfo:eu-repo/grantAgreement/ES/1PE/TEC2013-47264en
dc.relation.publisherversionhttps://dx.doi.org/10.1109/JLT.2016.2593747
dc.type.versionVersión aceptada / Onetsi den bertsioaes
dc.type.versioninfo:eu-repo/semantics/acceptedVersionen
dc.contributor.funderUniversidad Pública de Navarra / Nafarroako Unibertsitate Publikoa


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