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Transient differential pressure-induced loss variation in as-drawn hollow core optical fibres

Transient differential pressure-induced loss variation in as-drawn hollow core optical fibres
Transient differential pressure-induced loss variation in as-drawn hollow core optical fibres
We demonstrate transient changes in the optical properties, specifically the loss, of antiresonant hollow core fibres (HCFs) due to a combination of the sub-atmospheric gas pressure inside the fibre holes post-fabrication and the subsequent gas-induced differential refractive index (GDRI) between the core and cladding elements of the fibre; this is temporarily created while the gas pressures inside the core and cladding elements are evolving after the HCF ends are opened up to surrounding atmospheric pressure. Here we show experimental evidence of this effect in two different HCF designs; for both fibres, the transmitted power initially increases, reaches a maximum, and then reduces to its initial level. We show via gas flow simulations that the timeline of this behaviour is consistent with the gas flow rates into the core and cladding elements of the tubular HCF studied and the subsequent transient differential gas pressure. The experimental results also show (in line with GDRI expectations) that this transmission (loss) change is higher at shorter wavelengths. Our results imply that this transient change in the fibre’s optical properties must be considered for accurate fibre characterisation; this is particularly true for long fibre lengths where the equalisation of the fibre’s internal gas pressure with atmospheric pressure could take many weeks.
Hollow core fibres, characterisation, loss
0277-786X
SPIE
Rikimi, Shuichiro
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Kelly, Thomas William
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Horak, Peter
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Davidson, Ian
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Chen, Yong
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Bradley, Thomas
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Taranta, Austin
bc2e834f-0d85-44a1-a874-8150df1f73d9
Poletti, Francesco
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Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Wheeler, Natalie
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Bawn, Simon
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Kalli, Kyriacos
Peterka, Pavel
Bunge, Christian-Alexander
Rikimi, Shuichiro
a2432579-b2fe-4131-8061-30c681e25576
Kelly, Thomas William
64bf9b49-b287-4d23-8809-a2627f8d4bf2
Horak, Peter
520489b5-ccc7-4d29-bb30-c1e36436ea03
Davidson, Ian
b685f949-e9e4-4e6b-9a59-36739de06a61
Chen, Yong
0bfb3083-4cd2-4463-a7a4-f48c4158b15a
Bradley, Thomas
d4cce4f3-bb69-4e14-baee-cd6a88e38101
Taranta, Austin
bc2e834f-0d85-44a1-a874-8150df1f73d9
Poletti, Francesco
9adcef99-5558-4644-96d7-ce24b5897491
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Wheeler, Natalie
0fd34178-a77b-4c71-a3a6-86a1f634f1a0
Bawn, Simon
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Kalli, Kyriacos
Peterka, Pavel
Bunge, Christian-Alexander

Rikimi, Shuichiro, Kelly, Thomas William, Horak, Peter, Davidson, Ian, Chen, Yong, Bradley, Thomas, Taranta, Austin, Poletti, Francesco, Richardson, David J., Wheeler, Natalie and Bawn, Simon (2022) Transient differential pressure-induced loss variation in as-drawn hollow core optical fibres. Kalli, Kyriacos, Peterka, Pavel and Bunge, Christian-Alexander (eds.) In Micro-Structured and Specialty Optical Fibres VII. vol. 12140, SPIE. 6 pp . (doi:10.1117/12.2621301).

Record type: Conference or Workshop Item (Paper)

Abstract

We demonstrate transient changes in the optical properties, specifically the loss, of antiresonant hollow core fibres (HCFs) due to a combination of the sub-atmospheric gas pressure inside the fibre holes post-fabrication and the subsequent gas-induced differential refractive index (GDRI) between the core and cladding elements of the fibre; this is temporarily created while the gas pressures inside the core and cladding elements are evolving after the HCF ends are opened up to surrounding atmospheric pressure. Here we show experimental evidence of this effect in two different HCF designs; for both fibres, the transmitted power initially increases, reaches a maximum, and then reduces to its initial level. We show via gas flow simulations that the timeline of this behaviour is consistent with the gas flow rates into the core and cladding elements of the tubular HCF studied and the subsequent transient differential gas pressure. The experimental results also show (in line with GDRI expectations) that this transmission (loss) change is higher at shorter wavelengths. Our results imply that this transient change in the fibre’s optical properties must be considered for accurate fibre characterisation; this is particularly true for long fibre lengths where the equalisation of the fibre’s internal gas pressure with atmospheric pressure could take many weeks.

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Accepted/In Press date: 8 March 2022
Published date: 3 April 2022
Additional Information: Funding Information: This project gratefully acknowledges funding from the Royal Society (University Research Fellowship, N.V. Wheeler), EPSRC Programme grant Airguide Photonics (EP/P030181/1) and the EPSRC Future Photonics Hub (EP/N00762X/1).
Venue - Dates: SPIE Photonics Europe 2022, , Strasbourg, France, 2022-04-03 - 2022-05-23
Keywords: Hollow core fibres, characterisation, loss

Identifiers

Local EPrints ID: 470090
URI: http://eprints.soton.ac.uk/id/eprint/470090
ISSN: 0277-786X
PURE UUID: 0d56b3a2-1ae5-4a82-86ae-1f7fe9b47a18
ORCID for Peter Horak: ORCID iD orcid.org/0000-0002-8710-8764
ORCID for Yong Chen: ORCID iD orcid.org/0000-0003-0383-6113
ORCID for Thomas Bradley: ORCID iD orcid.org/0000-0001-6568-5811
ORCID for Austin Taranta: ORCID iD orcid.org/0000-0002-5666-6800
ORCID for Francesco Poletti: ORCID iD orcid.org/0000-0002-1000-3083
ORCID for David J. Richardson: ORCID iD orcid.org/0000-0002-7751-1058
ORCID for Natalie Wheeler: ORCID iD orcid.org/0000-0002-1265-9510

Catalogue record

Date deposited: 03 Oct 2022 16:46
Last modified: 18 Mar 2024 03:34

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Contributors

Author: Shuichiro Rikimi
Author: Thomas William Kelly
Author: Peter Horak ORCID iD
Author: Ian Davidson
Author: Yong Chen ORCID iD
Author: Thomas Bradley ORCID iD
Author: Austin Taranta ORCID iD
Author: Francesco Poletti ORCID iD
Author: Natalie Wheeler ORCID iD
Author: Simon Bawn
Editor: Kyriacos Kalli
Editor: Pavel Peterka
Editor: Christian-Alexander Bunge

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