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Tapered silicon core fibres for supercontinuum generation

Tapered silicon core fibres for supercontinuum generation
Tapered silicon core fibres for supercontinuum generation
A series of silicon-core fibre tapers are designed that allow for longitudinal variation of their nonlinear and dispersion parameters with length. A supercontinuum (SC) is generated in the waist region of the taper due to the increased nonlinearity there. The long-wavelength edge of the SC is then boosted by up-tapering to a specific core diameter which is chosen to optimise the phase-matching conditions for four-wave mixing. This means that the bulk of the initially-generated SC can be used as pump sources for transferring power to the long-wavelength edge. Each design targets a specific wavelength range with a 0.25 µm bandwidth. The design work is driven by simulations of mid-infrared laser pulse propagation through the fibres, which work by solving the generalised nonlinear Schrödinger equation (GNLSE). This incorporates numerous nonlinear effects in silicon affecting SC generation, including two-photon absorption (TPA), three-photon absorption and free-carrier effects. The wavelength-dependence of linear loss and the effective area of the fundamental mode is incorporated into the GNLSE, which is extended to also incorporate the wavelength-dependence of TPA. The possibility of using these taper design principles is also explored for silicon on-insulator waveguides.
University of Southampton
Campling, Joseph
daeaf1d9-ff3c-4efd-a618-3a248b79e7f5
Campling, Joseph
daeaf1d9-ff3c-4efd-a618-3a248b79e7f5
Peacock, Anna
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Campling, Joseph (2021) Tapered silicon core fibres for supercontinuum generation. University of Southampton, Doctoral Thesis, 141pp.

Record type: Thesis (Doctoral)

Abstract

A series of silicon-core fibre tapers are designed that allow for longitudinal variation of their nonlinear and dispersion parameters with length. A supercontinuum (SC) is generated in the waist region of the taper due to the increased nonlinearity there. The long-wavelength edge of the SC is then boosted by up-tapering to a specific core diameter which is chosen to optimise the phase-matching conditions for four-wave mixing. This means that the bulk of the initially-generated SC can be used as pump sources for transferring power to the long-wavelength edge. Each design targets a specific wavelength range with a 0.25 µm bandwidth. The design work is driven by simulations of mid-infrared laser pulse propagation through the fibres, which work by solving the generalised nonlinear Schrödinger equation (GNLSE). This incorporates numerous nonlinear effects in silicon affecting SC generation, including two-photon absorption (TPA), three-photon absorption and free-carrier effects. The wavelength-dependence of linear loss and the effective area of the fundamental mode is incorporated into the GNLSE, which is extended to also incorporate the wavelength-dependence of TPA. The possibility of using these taper design principles is also explored for silicon on-insulator waveguides.

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Submitted date: 4 November 2021

Identifiers

Local EPrints ID: 457069
URI: http://eprints.soton.ac.uk/id/eprint/457069
PURE UUID: c9dd528a-87c5-475c-b4e0-e9473c01659f
ORCID for Anna Peacock: ORCID iD orcid.org/0000-0002-1940-7172

Catalogue record

Date deposited: 23 May 2022 16:46
Last modified: 17 Mar 2024 02:56

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Contributors

Author: Joseph Campling
Thesis advisor: Anna Peacock ORCID iD

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