Signal-to-Noise Ratio Improvement in BOTDA Using Balanced Detection
Autores
Domínguez López, Alejandro; López Gil, Alexia Inés; Martín López, Sonia; González Herráez, MiguelIdentificadores
Enlace permanente (URI): http://hdl.handle.net/10017/25137DOI: 10.1109/LPT.2013.2293603
ISSN: 1041-1135
Editor
IEEE
Fecha de publicación
2014-02Patrocinadores
Comunidad de Madrid
European Commission
Ministerio de Ciencia e Innovación
Cita bibliográfica
A. Domínguez-López, A. López-Gil, S. Martín-López and M. González-Herráez, "Signal-to-Noise Ratio Improvement in BOTDA Using Balanced Detection," IEEE Photonics Technology Letters, 2014, v. 26, n. 4, pp. 338-341.
Palabras clave
Brillouin scattering
Distributed optic fiber sensor
Balanced detection
Temperature sensor
Proyectos
info:eu-repo/grantAgreement/CAM//S2009%2FESP1781/ES//FACTOTEM2
info:eu-repo/grantAgreement/EC/FP7/307441/EU/Ubiquitous optical FIbre NErves/U-FINE
info:eu-repo/grantAgreement/EC/Interreg Sudoe/SOE3%2FP2%2FP714/EU/Gestión ecológica de pilas de residuos de carbón en combustión/ECOAL-MGT
info:eu-repo/grantAgreement/MICINN//TEC2009-14423-C02-01/ES/Aplicacion Del Laser Femto Fibre Comb A La Metrologia De Frecuencias Para Comunicaciones Opticas/
info:eu-repo/grantAgreement/MICINN//TEC2009-14423-C02-02/ES/Aplicacion Del Laser Femtocomb Al Estudio De Estructuras Semiconductoras Para Comunicaciones Opticas/
Tipo de documento
info:eu-repo/semantics/article
Versión
info:eu-repo/semantics/publishedVersion
Derechos
Atribución-NoComercial-SinDerivadas 3.0 España
(c) 2013 IEEE
Derechos de acceso
info:eu-repo/semantics/openAccess
Resumen
Brillouin optical time domain analysis (BOTDA)
relies typically on the interaction among two counter-propagating
waves: 1) a pulsed pump wave and 2) a modulated probe
wave. The modulated probe wave has typically two sidebands,
located at ±νB with respect to the pump frequency. Conventional
systems detect the time-resolved gain/loss by detecting only the
upper/lower wavelength sideband. In this letter, we show that
BOTDA can strongly benefit from the use of balanced detection
among the two sidebands. In particular, the detected signal can be
doubled while the noise only grows by a factor of (2)1/2, leading
to a (2)1/2 signal-to noise ratio (SNR) increase. Moreover, any
common-mode noise in the probe signal path (e.g., master laser
noise, modulator drifts, and so forth) is eliminated, rendering the
system more robust. We validate the principle by experimental
results that highlight the benefits of the technique in terms of
the SNR.
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