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Título

Distributed vibration sensing over 125 km with enhanced SNR using Phi-OTDR over a URFL cavity

AutorMartins, Hugo F.; Martín-López, Sonia; Corredera, Pedro ; Ania Castañón, Juan Diego ; Frazao, O.; González-Herraez, M.
Palabras claveOptical fiber amplifiers
Vibrations
Vibration measurement
Stimulated emission
Optical fiber sensors
Noise
Fecha de publicaciónjun-2015
EditorOptical Society of America
CitaciónJournal 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 editorhttp://dx.doi.org/10.1109/JLT.2015.2396359
URIhttp://hdl.handle.net/10261/130615
DOI10.1109/JLT.2015.2396359
Identificadoresdoi: 10.1109/JLT.2015.2396359
issn: 0733-8724
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