%0 Journal Article 
%A Fidalgo Martins, Hugo
%A Martín López, Sonia
%A Filograno, M. L.
%A Corredera, Pedro
%A Frazão, O.
%A González Herráez, Miguel
%T Comparison of the use of first and second-order Raman amplification to assist a phase-sensitive optical time domain reflectometer in distributed vibration sensing over 125 km
%D 2014
%@ 0277-786X
%U http://hdl.handle.net/10017/26477
%X We report on the use of second-order Raman amplification to assist a phase-sensitive optical time domain reflectometer
( φOTDR ) used for vibration measurements over very long distances. 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 no postprocessing.
Balanced detection is used to reduce the relative intensity noise. A comparison with a sensor using first-order
Raman amplification under similar conditions is presented and a clear improvement of performance is demonstrated.
%K Distributed sensor
%K Optical fiber sensors
%K Phase-sensitive OTDR
%K Vibration sensor
%K Raman scattering
%K Ciencias tecnológicas
%K Electrónica
%K Technology
%K Electronics
%~ Biblioteca Universidad de Alcala