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

dc.contributor.author	Hugo Fidalgo Martins	en
dc.contributor.author	Martin Lopez,S	en
dc.contributor.author	Filograno,ML	en
dc.contributor.author	Corredera,P	en
dc.contributor.author	Orlando Frazão	en
dc.contributor.author	Gonzalez Herraez,M	en
dc.date.accessioned	2017-11-20T10:38:02Z
dc.date.available	2017-11-20T10:38:02Z
dc.date.issued	2014	en
dc.description.abstract	We report on the use of second-order Raman amplification to assist a phase-sensitive optical time domain reflectometer (phi OTDR) 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 post-processing. 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.	en
dc.identifier.uri	http://repositorio.inesctec.pt/handle/123456789/3537
dc.identifier.uri	http://dx.doi.org/10.1117/12.2059483	en
dc.language	eng	en
dc.relation	4061	en
dc.rights	info:eu-repo/semantics/openAccess	en
dc.title	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	en
dc.type	conferenceObject	en
dc.type	Publication	en