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Título: | Distributed vibration sensing over 125 km with enhanced SNR using Phi-OTDR over a URFL cavity |
Autor: | Martins, Hugo F. CSIC ORCID CVN ; Martín-López, Sonia CSIC ORCID; Corredera, Pedro CSIC ORCID; Ania Castañón, Juan Diego CSIC ORCID; Frazão, Orlando ; González-Herráez, Miguel CSIC ORCID | Palabras clave: | Optical fiber amplifiers Vibrations Vibration measurement Stimulated emission Optical fiber sensors Noise |
Fecha de publicación: | jun-2015 | Editor: | Optical Society of America | Citación: | Journal of Lightwave Technology 33: 2628- 2632 (2015) | Resumen: | © 2015 IEEE. We describe the use of a phase-sensitive optical time domain reflectometer (φOTDR) over an ultra-long Raman fiber laser cavity allowing fully distributed detection of vibrations over 125 km. Compared to a first-order Raman-assisted φOTDR, this scheme shows an enhanced signal-to-noise ratio (SNR). This is due to the fact that the relative intensity noise introduced by the Raman amplification is mostly transferred to a lower frequency range, where the balanced detection implemented in the setup provides better suppression of the common-mode noise. The sensor was able to measure vibrations of up to 380 Hz (limit set by the time of flight of light pulses) in a distance of 125 km with a resolution of 10 m and an average SNR of 8 dB with no postprocessing. This implies a >3 dB improvement in SNR over a first-order Raman-assisted setup with similar characteristics. | Versión del editor: | http://dx.doi.org/10.1109/JLT.2015.2396359 | URI: | http://hdl.handle.net/10261/130615 | DOI: | 10.1109/JLT.2015.2396359 | Identificadores: | doi: 10.1109/JLT.2015.2396359 issn: 0733-8724 |
Aparece en las colecciones: | (CFMAC-IO) Artículos |
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