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Leaky mode integrated optical fibre refractometer

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.

1094-4087
9155-9164
Gray, Alan Ciaran
fa9f2fca-7e1f-4245-a914-13f18ca5ce89
Jantzen, Alexander
af05e45f-d153-4b8e-ae8b-6474fba5501a
Gow, P.C.
193394b1-fe2d-41de-a9aa-6de7e5925b18
Smith, Devin H.
49156a41-41f1-4f1b-8ce3-ef6f894e190c
Gawith, Corin B.E.
926665c0-84c7-4a1d-ae19-ee6d7d14c43e
Smith, Peter G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Holmes, Christopher
16306bb8-8a46-4fd7-bb19-a146758e5263
Gray, Alan Ciaran
fa9f2fca-7e1f-4245-a914-13f18ca5ce89
Jantzen, Alexander
af05e45f-d153-4b8e-ae8b-6474fba5501a
Gow, P.C.
193394b1-fe2d-41de-a9aa-6de7e5925b18
Smith, Devin H.
49156a41-41f1-4f1b-8ce3-ef6f894e190c
Gawith, Corin B.E.
926665c0-84c7-4a1d-ae19-ee6d7d14c43e
Smith, Peter G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Holmes, Christopher
16306bb8-8a46-4fd7-bb19-a146758e5263

Gray, Alan Ciaran, Jantzen, Alexander, Gow, P.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), 9155-9164. (doi:10.1364/OE.26.009155).

Record type: Article

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.

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More information

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: https://eprints.soton.ac.uk/id/eprint/419631
ISSN: 1094-4087
PURE UUID: 4459f4f6-6abb-4b73-aa49-5ee62e9a798f
ORCID for P.C. Gow: ORCID iD orcid.org/0000-0002-3247-9082
ORCID for Corin B.E. Gawith: ORCID iD orcid.org/0000-0002-3502-3558

Catalogue record

Date deposited: 17 Apr 2018 16:30
Last modified: 17 Sep 2019 01:02

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