Leaky mode integrated optical fibre refractometer
Leaky mode integrated optical fibre refractometer
A route to monitor external refractive indices greater than the core index of the waveguide is presented. Initial application utilizes an integrated optical fibre (IOF) platform due to its potential for use in harsh environment sensing. IOF is fabricated using a bespoke flame hydrolysis deposition process to fuse an optical fibre to a planar substrate achieving an optical quality, ruggedized glass layer between the fibre and substrate was fabricated. The presented refractometer is created by direct UV writing of multiple fibre Bragg gratings into an etched (22 µm diameter) optical fibre post fabrication. Linear regression analysis is applied to quantify propagation loss by monitoring each FBG’s back reflected power. The device operates with a sensitivity of approximately 350 dB/cm/RIU at a refractive index of 1.451 at 1550 nm. Numerical simulations using a transfer matrix method are presented and potential routes for development are discussed.
9155-9164
Gray, Alan C.
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Jantzen, Alexander
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Gow, Paul C.
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Smith, Devin H.
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Gawith, Corin B.E.
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Smith, Peter G.R.
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Holmes, Christopher
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2 April 2018
Gray, Alan C.
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Jantzen, Alexander
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Gow, Paul C.
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Smith, Devin H.
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Gawith, Corin B.E.
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Smith, Peter G.R.
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Holmes, Christopher
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Gray, Alan C., Jantzen, Alexander, Gow, Paul C., Smith, Devin H., Gawith, Corin B.E., Smith, Peter G.R. and Holmes, Christopher
(2018)
Leaky mode integrated optical fibre refractometer.
Optics Express, 26 (7), .
(doi:10.1364/oe.26.009155).
Abstract
A route to monitor external refractive indices greater than the core index of the waveguide is presented. Initial application utilizes an integrated optical fibre (IOF) platform due to its potential for use in harsh environment sensing. IOF is fabricated using a bespoke flame hydrolysis deposition process to fuse an optical fibre to a planar substrate achieving an optical quality, ruggedized glass layer between the fibre and substrate was fabricated. The presented refractometer is created by direct UV writing of multiple fibre Bragg gratings into an etched (22 µm diameter) optical fibre post fabrication. Linear regression analysis is applied to quantify propagation loss by monitoring each FBG’s back reflected power. The device operates with a sensitivity of approximately 350 dB/cm/RIU at a refractive index of 1.451 at 1550 nm. Numerical simulations using a transfer matrix method are presented and potential routes for development are discussed.
Text
oe-26-7-9155
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Accepted/In Press date: 2 March 2018
e-pub ahead of print date: 29 March 2018
Published date: 2 April 2018
Identifiers
Local EPrints ID: 419631
URI: http://eprints.soton.ac.uk/id/eprint/419631
ISSN: 1094-4087
PURE UUID: 4459f4f6-6abb-4b73-aa49-5ee62e9a798f
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Date deposited: 17 Apr 2018 16:30
Last modified: 18 Mar 2024 03:21
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Contributors
Author:
Alan C. Gray
Author:
Alexander Jantzen
Author:
Devin H. Smith
Author:
Christopher Holmes
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