Distributed vibration sensing over 125 km with enhanced SNR using ΦOTDR over a URFL cavity
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). Th...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universidad de Alcalá (UAH) |
| Repositorio: | e_Buah Biblioteca Digital Universidad de Alcalá |
| Idioma: | inglés |
| OAI Identifier: | oai:ebuah.uah.es:10017/26309 |
| Acceso en línea: | http://hdl.handle.net/10017/26309 https://dx.doi.org/10.1109/JLT.2015.2396359 |
| Access Level: | acceso abierto |
| Palabra clave: | Distributed sensor Optical fiber sensors Raman scattering Vibration sensor Phase sensitive OTDR Electrónica Electronics |
| Sumario: | 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 |
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