Pump-Power-Independent Double Slope-Assisted Distributed and Fast Brillouin Fiber-Optic Sensor

A small modification of the fast and distributed slope-assisted Brillouin time domain analysis (SA-BOTDA) method allows it to easily implement pump-power independent measurements of strain and/or temperature, using the ratio between readings taken on both slopes of the Brillouin gain spectrum. Emplo...

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Published in:IEEE photonics technology letters 2014-04, Vol.26 (8), p.797-800
Main Authors: Motil, Avi, Danon, Orr, Peled, Yair, Tur, Moshe
Format: Article
Language:English
Subjects:
Brillouin scattering
nonlinear optics
Optical fiber polarization
Optical fiber sensors
Probes
Scattering
Strain
Strain measurement
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description A small modification of the fast and distributed slope-assisted Brillouin time domain analysis (SA-BOTDA) method allows it to easily implement pump-power independent measurements of strain and/or temperature, using the ratio between readings taken on both slopes of the Brillouin gain spectrum. Employing this new double SA-BOTDA measurement technique, fast ( {\sim}{\rm 100}~{\rm Hz} at {\sim}{\rm 1}\hbox{-}{\rm kHz} effective sampling rate) strain measurements are shown to be immune to pump pulse power variations as large as 6 dB. At the expense of halving the sampling rate, this technique still maintains all the benefits of its SA-BOTDA predecessor. In particular, its ability to handle (Brillouin) longitudinally inhomogeneous fibers is demonstrated.
doi_str_mv 10.1109/LPT.2014.2302833
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subjects Brillouin scattering
nonlinear optics
Optical fiber polarization
Optical fiber sensors
Probes
Scattering
Strain
Strain measurement
title Pump-Power-Independent Double Slope-Assisted Distributed and Fast Brillouin Fiber-Optic Sensor
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