• Login
    View Item 
    •   Academica-e
    • Departamentos y Centros - Sailak eta Ikastegiak
    • Dpto. Ingeniería Eléctrica y Electrónica - Ingeniaritza Elektriko eta Elektronikoa Saila
    • Artículos de revista DIEE - IEES Aldizkari artikuluak
    • View Item
    •   Academica-e
    • Departamentos y Centros - Sailak eta Ikastegiak
    • Dpto. Ingeniería Eléctrica y Electrónica - Ingeniaritza Elektriko eta Elektronikoa Saila
    • Artículos de revista DIEE - IEES Aldizkari artikuluak
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Gain dependence of the phase-shift spectra measured in coherent Brillouin optical time-domain analysis sensors

    Thumbnail
    View/Open
    GainDependence.pdf (1.895Mb)
    Date
    2016
    Author
    Mariñelarena Ollacarizqueta, Jon Upna Orcid
    Urricelqui Polvorinos, Javier Upna Orcid
    Loayssa Lara, Alayn Upna Orcid
    Version
    Acceso abierto / Sarbide irekia
    Type
    Artículo / Artikulua
    Version
    Versión aceptada / Onetsi den bertsioa
    Project Identifier
    MINECO//TEC2013-47264-C2-2-R/ES/ openaire
    Impact
     
     
     
    10.1109/JLT.2016.2593747
     
     
    Show full item record
    Abstract
    We 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 th ... [++]
    We 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. [--]
    Subject
    Brillouin optical time-domain analysis, Brillouin scattering, Coherent sensors, Dynamic sensing
     
    Publisher
    IEEE
    Published in
    Journal of Lightwave Technology, vol. 34, no. 17, September 1, 2016
    Departament
    Universidad Pública de Navarra. Departamento de Ingeniería Eléctrica y Electrónica / Nafarroako Unibertsitate Publikoa. Ingeniaritza Elektrikoa eta Elektronikoa Saila
     
    Publisher version
    https://dx.doi.org/10.1109/JLT.2016.2593747
    URI
    https://hdl.handle.net/2454/22583
    Sponsorship
    This 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.
    Appears in Collections
    • Artículos de revista DIEE - IEES Aldizkari artikuluak [361]
    • Artículos de revista - Aldizkari artikuluak [4925]
    Items in Academica-e are protected by copyright with all rights reserved, unless otherwise noted.

     © Universidad Pública de Navarra - Nafarroako Unibertsitate Publikoa
         Repositorio basado en DSpace

    Contact Us | Send Feedback
     

     

    Browse

    All of Academica-eCommunities & CollectionsAuthorsAuthors By Issue DateTitlesSubjectsBy DegreeThis CollectionAuthorsAuthors By Issue DateTitlesSubjectsBy Degree

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

     © Universidad Pública de Navarra - Nafarroako Unibertsitate Publikoa
         Repositorio basado en DSpace

    Contact Us | Send Feedback