We describe the use of a phase-sensitive optical time domain reflectometer () over an ultra-
long Raman fiber laser cavity allowing fully distributed detection of vibrations over 125 km …

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 …

A phase-sensitive optical time-domain reflectometry (Φ-OTDR) with 175 km sensing range
and 25 m spatial resolution is demonstrated, using the combination of co-pumping second …

A phase-sensitive optical time-domain reflectometry with 175km sensing range is
demonstrated using the combination of co-pumping 2nd-order Raman amplification based …

Phase-sensitive optical time domain reflectometry (φOTDR) is a simple and effective tool
allowing the distributed monitoring of vibrations along single-mode fibers. Up to now …

We have evaluated the performance of a phase-sensitive optical time domain reflectometry
(φ-OTDR) system for vibration measurements utilizing a conventional telecom DFB laser self …

The behaviour of distributed temperature sensors based on spontaneous Raman scattering
and coded OTDR (optical time domain reflectometry) is studied both theoretically and …

We propose a phase-sensitive optical time-domain reflectometry (Φ-OTDR) scheme with
counterpumping fiber Brillouin amplification (FBA). High-sensitivity perturbation detection …

The use of linearly chirped probe pulses in phase-sensitive optical time-domain
reflectometry (ΦOTDR) technology has been recently demonstrated to allow for high …

Phase-sensitive optical time-domain reflectometry (φOTDR) is widely used for the distributed
detection of mechanical or environmental variations with resolutions of typically a few …