Abstract
A novel technique combining Brillouin phase-shift measurements with Brillouin dynamic gratings (BDGs) reflectometry in polarization-maintaining fibers is presented here for the first time. While a direct measurement of the optical phase in standard BDG setups is impractical due to non-local phase contributions, their detrimental effect is reduced by ∼4 orders of magnitude through the coherent addition of Stokes and anti-Stokes reflections from two counter-propagating BDGs in the fiber. The technique advantageously combines the high-spatial-resolution of BDGs reflectometry with the increased tolerance to optical power fluctuations of phasorial measurements, to enhance the performance of fiber-optic strain sensors. We demonstrate a distributed measurement (20cm spatial-resolution) of both static and dynamic (5kHz of vibrations at a sampling rate of 1MHz) strain fields acting on the fiber, in good agreement with theory and (for the static case) with the results of commercial reflectometers.
Original language | English |
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Pages (from-to) | 5376-5388 |
Number of pages | 13 |
Journal | Optics Express |
Volume | 25 |
Issue number | 5 |
DOIs | |
State | Published - 6 Mar 2017 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2017 Optical Society of America.
Funding
This research was supported by the Israel Science Foundation (grant No. 1380/12).
Funders | Funder number |
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Israel Science Foundation | 1380/12 |