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Integrated optical devices in side-polished fibres

Integrated optical devices in side-polished fibres
Integrated optical devices in side-polished fibres
Fibre side-polishing technology was explored to meet the need for miniature, multifunctional, and low-loss device platforms for optical applications. Different polishing techniques were investigated to achieve side-polished fibres with low transmission loss, high polished surface quality and long interaction lengths. This side-polished fibre platform was combined with some of the most popular two-dimensional materials, including graphene and molybdenum disulfide, to fabricate integrated optical fibre devices. A high refractive index polyvinyl butyral layer was coated on top of graphene and molybdenum disulfide to enhance the light-matter interaction between the evanescent field of the core guided mode and the two-dimensional materials. By using the excellent photonic properties of graphene, a broadband graphene-based fibre polariser was proposed and fabricated using the low-loss side-polished optical fibre platform. Characterisation of the optical properties revealed that the graphene-based polariser retains low transmission losses and high extinction ratios across an extended telecoms band. The graphene-based fibre device was also utilized to demonstrate a high-speed, in-fibre optical modulator, which realised fast modulation speed and high modulation depth. By using the same design, a low-loss molybdenum disulfide-based all-optical modulator was also demonstrated with a even higher modulation depth. Wavelength-dependent interaction and spectral broadening was observed in the molybdenum disulfide sheet, suggesting that the higher modulation depth was from a resonance-enhanced interaction. To extend the application scenarios of the side-polishing technique, a low loss, wideband multi-core to single-mode fibre coupler was also demonstrated. The coupler was designed to access light from a single core of the multi-core fibre without disrupting the signal propagation in the remaining cores. The coupling ratio between the two fibres could be continuously tuned over the entire spectral band via a simple mechanical displacement method.
University of Southampton
Zhang, Haojie
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Zhang, Haojie
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Peacock, Anna
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Healy, Noel
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Hewak, Daniel
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Huang, Chung-Che
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Runge, Antoine FJ
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Richardson, David
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Petrovich, Marco
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Hayes, John
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Dasgupta, Sonali
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Zheludev, Nikolai
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Zhang, Haojie (2017) Integrated optical devices in side-polished fibres. University of Southampton, Doctoral Thesis, 141pp.

Record type: Thesis (Doctoral)

Abstract

Fibre side-polishing technology was explored to meet the need for miniature, multifunctional, and low-loss device platforms for optical applications. Different polishing techniques were investigated to achieve side-polished fibres with low transmission loss, high polished surface quality and long interaction lengths. This side-polished fibre platform was combined with some of the most popular two-dimensional materials, including graphene and molybdenum disulfide, to fabricate integrated optical fibre devices. A high refractive index polyvinyl butyral layer was coated on top of graphene and molybdenum disulfide to enhance the light-matter interaction between the evanescent field of the core guided mode and the two-dimensional materials. By using the excellent photonic properties of graphene, a broadband graphene-based fibre polariser was proposed and fabricated using the low-loss side-polished optical fibre platform. Characterisation of the optical properties revealed that the graphene-based polariser retains low transmission losses and high extinction ratios across an extended telecoms band. The graphene-based fibre device was also utilized to demonstrate a high-speed, in-fibre optical modulator, which realised fast modulation speed and high modulation depth. By using the same design, a low-loss molybdenum disulfide-based all-optical modulator was also demonstrated with a even higher modulation depth. Wavelength-dependent interaction and spectral broadening was observed in the molybdenum disulfide sheet, suggesting that the higher modulation depth was from a resonance-enhanced interaction. To extend the application scenarios of the side-polishing technique, a low loss, wideband multi-core to single-mode fibre coupler was also demonstrated. The coupler was designed to access light from a single core of the multi-core fibre without disrupting the signal propagation in the remaining cores. The coupling ratio between the two fibres could be continuously tuned over the entire spectral band via a simple mechanical displacement method.

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Published date: November 2017

Identifiers

Local EPrints ID: 425626
URI: http://eprints.soton.ac.uk/id/eprint/425626
PURE UUID: 5ecfdc54-aec9-4855-868a-dc241e636741
ORCID for Haojie Zhang: ORCID iD orcid.org/0000-0002-4577-3600
ORCID for Anna Peacock: ORCID iD orcid.org/0000-0002-1940-7172
ORCID for Daniel Hewak: ORCID iD orcid.org/0000-0002-2093-5773
ORCID for Chung-Che Huang: ORCID iD orcid.org/0000-0003-3471-2463
ORCID for David Richardson: ORCID iD orcid.org/0000-0002-7751-1058
ORCID for Marco Petrovich: ORCID iD orcid.org/0000-0002-3905-5901
ORCID for Nikolai Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

Catalogue record

Date deposited: 26 Oct 2018 16:30
Last modified: 14 Mar 2019 01:54

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Contributors

Author: Haojie Zhang ORCID iD
Thesis advisor: Anna Peacock ORCID iD
Thesis advisor: Noel Healy
Thesis advisor: Daniel Hewak ORCID iD
Thesis advisor: Chung-Che Huang ORCID iD
Thesis advisor: Antoine FJ Runge
Thesis advisor: David Richardson ORCID iD
Thesis advisor: Marco Petrovich ORCID iD
Thesis advisor: John Hayes
Thesis advisor: Sonali Dasgupta
Thesis advisor: Nikolai Zheludev ORCID iD

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