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Polarization effects on thermally stable latency in hollow-core photonic bandgap fibers

Polarization effects on thermally stable latency in hollow-core photonic bandgap fibers
Polarization effects on thermally stable latency in hollow-core photonic bandgap fibers
Conveyance of light in air endows hollow-core optical fibers with remarkably low sensitivity of the propagation delay to temperature changes. This sensitivity was demonstrated to be further reduced and even made negative (crossing zero) in photonic bandgap type of hollow core fibers. When operating long lengths of this fiber close to the zero sensitivity wavelength, it was observed experimentally that there is a small residual variation in propagation delay which had no apparent correlation to imposed temperature changes. In this paper, we analyze the polarization effects that give rise to this variation, showing that the highest level of practically achievable thermal stability of the latency is limited by polarization mode dispersion. We show measurements of differential group delay between polarization modes in long lengths of photonic bandgap fiber at various temperatures and focus on spectral regions where thermally stable latency is predicted and measured. Our experimental observations, corroborated by numerical simulations, indicate the presence of strong polarization mode coupling in the fibers in addition to birefringence. The detailed understanding gained through this study allows us to propose practically achievable (i.e., manufacturable) fiber designs with up to three orders of magnitude lower polarization mode dispersion at wavelengths where the latency is insensitive to thermal fluctuations. This paves the way to fibers with polarization independent and thermally stable latency to serve a multitude of applications.
0733-8724
Numkam Fokoua, Eric
6d9f7e50-dc3b-440a-a0b9-f4a08dd02ccd
Zhu, Wenwu
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Ding, Meng
45fbd64c-522d-45ff-a918-013404105cdb
Feng, Zitong
21760dcd-7979-4733-bc84-dea53c64a81c
Chen, Yong
0bfb3083-4cd2-4463-a7a4-f48c4158b15a
Bradley, Thomas D.
d4cce4f3-bb69-4e14-baee-cd6a88e38101
Jasion, Gregory T.
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Richardson, David
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Poletti, Francesco
9adcef99-5558-4644-96d7-ce24b5897491
Slavík, Radan
8d24357c-24d6-4ada-9ec9-cca14c757f95
Numkam Fokoua, Eric
6d9f7e50-dc3b-440a-a0b9-f4a08dd02ccd
Zhu, Wenwu
64f4dc72-27e8-467a-894d-e260c81c4e71
Ding, Meng
45fbd64c-522d-45ff-a918-013404105cdb
Feng, Zitong
21760dcd-7979-4733-bc84-dea53c64a81c
Chen, Yong
0bfb3083-4cd2-4463-a7a4-f48c4158b15a
Bradley, Thomas D.
d4cce4f3-bb69-4e14-baee-cd6a88e38101
Jasion, Gregory T.
16cfff1d-d178-41d1-a092-56e6239726b8
Richardson, David
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Poletti, Francesco
9adcef99-5558-4644-96d7-ce24b5897491
Slavík, Radan
8d24357c-24d6-4ada-9ec9-cca14c757f95

Numkam Fokoua, Eric, Zhu, Wenwu, Ding, Meng, Feng, Zitong, Chen, Yong, Bradley, Thomas D., Jasion, Gregory T., Richardson, David, Poletti, Francesco and Slavík, Radan (2020) Polarization effects on thermally stable latency in hollow-core photonic bandgap fibers. Journal of Lightwave Technology. (In Press)

Record type: Article

Abstract

Conveyance of light in air endows hollow-core optical fibers with remarkably low sensitivity of the propagation delay to temperature changes. This sensitivity was demonstrated to be further reduced and even made negative (crossing zero) in photonic bandgap type of hollow core fibers. When operating long lengths of this fiber close to the zero sensitivity wavelength, it was observed experimentally that there is a small residual variation in propagation delay which had no apparent correlation to imposed temperature changes. In this paper, we analyze the polarization effects that give rise to this variation, showing that the highest level of practically achievable thermal stability of the latency is limited by polarization mode dispersion. We show measurements of differential group delay between polarization modes in long lengths of photonic bandgap fiber at various temperatures and focus on spectral regions where thermally stable latency is predicted and measured. Our experimental observations, corroborated by numerical simulations, indicate the presence of strong polarization mode coupling in the fibers in addition to birefringence. The detailed understanding gained through this study allows us to propose practically achievable (i.e., manufacturable) fiber designs with up to three orders of magnitude lower polarization mode dispersion at wavelengths where the latency is insensitive to thermal fluctuations. This paves the way to fibers with polarization independent and thermally stable latency to serve a multitude of applications.

Text
Polarization Effects on Thermally Stable Latency in Hollow-Core Photonic Bandgap Fibers - Accepted Manuscript
Restricted to Repository staff only until 10 December 2022.
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Accepted/In Press date: 10 December 2020

Identifiers

Local EPrints ID: 446602
URI: http://eprints.soton.ac.uk/id/eprint/446602
ISSN: 0733-8724
PURE UUID: 49e67c44-0073-467a-9773-058326d7ece4
ORCID for Eric Numkam Fokoua: ORCID iD orcid.org/0000-0003-0873-911X
ORCID for Yong Chen: ORCID iD orcid.org/0000-0003-0383-6113
ORCID for Thomas D. Bradley: ORCID iD orcid.org/0000-0001-6568-5811
ORCID for Gregory T. Jasion: ORCID iD orcid.org/0000-0001-5030-6479
ORCID for David Richardson: ORCID iD orcid.org/0000-0002-7751-1058
ORCID for Francesco Poletti: ORCID iD orcid.org/0000-0002-1000-3083

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Date deposited: 16 Feb 2021 17:30
Last modified: 21 Apr 2021 01:47

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