RT info:eu-repo/semantics/article
T1 Phase-sensitive optical time domain reflectometer assisted by first-order raman amplification for distributed vibration sensing over >100 km
A1 Fidalgo Martins, Hugo
A1 Martín López, Sonia
A1 Corredera, Pedro
A1 Filograno, M. L.
A1 Frazão, O.
A1 González Herráez, Miguel
K1 Distributed sensor
K1 Optical fiber sensors
K1 Phase-sensitive optical time domain reflectometry (OTDR)
K1 Raman scattering
K1 Vibration sensor
K1 Ciencias tecnológicas
K1 Electrónica
K1 Technology
K1 Electronics
AB In this study, the authors present an experimental and theoretical description of the use of first order Raman amplification to improve the performance of a Phase-sensitive optical time domain reflectometer (φ OTDR) when used for vibration measurements over very long distances. A special emphasis is given to the noise which is carefully characterized and minimized along the setup. A semiconductor optical amplifier and an optical switch are used to greatly decrease the intra-band coherent noise of the setup and balanced detection is used to minimize the effects of RIN transferred from the Raman pumps. The sensor was able to detect vibrations of up to 250 Hz (close to the limits set by the time of flight of light pulses) with a resolution of 10 m in a range of 125 km. To achieve the above performance, no post-processing was required in the φOTDR signal. The evolution of the φOTDR signal along the fiber is also shown to have a good agreement with the theoretical model.
PB Institute of Electrical and Electronics Engineers
SN 0733-8724
YR 2014
FD 2014-04-15
LK http://hdl.handle.net/10017/26341
UL http://hdl.handle.net/10017/26341
LA eng
NO European Commission
DS MINDS@UW
RD 19-abr-2024