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
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
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Poletti, Francesco
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Richardson, David J.
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Wheeler, Natalie
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Bawn, Simon
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Bunge, Christian-Alexander
3 April 2022
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
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Bawn, Simon
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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.
Text
Photonics Europe
- Accepted Manuscript
Available under License Other.
Text
1214002
- Version of Record
Available under License Other.
More information
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
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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
Author:
Ian Davidson
Author:
Thomas Bradley
Author:
Austin Taranta
Author:
Francesco Poletti
Author:
Natalie Wheeler
Author:
Simon Bawn
Editor:
Kyriacos Kalli
Editor:
Pavel Peterka
Editor:
Christian-Alexander Bunge
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