Buglia, Henrique;
(2025)
Modelling and Optimisation of Ultra-wideband Optical Fibre Communication Systems.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
Physical layer modelling has been an important topic for optical fibre communication systems. The possibility of correctly estimating the different noise sources in these systems has enabled to supply the worldwide demand for data traffic using the currently deployed network. This thesis describes notable advances in modelling these systems, complying with new technologies currently commercially available in the optical fibre industry. Novel nonlinear models are proposed to accurately cope with different amplifiers, fibres, transmitter and receiver technologies, especially in the context of next-generation ultra-wideband (UWB) systems, where signal transmission is performed using bandwidths exceeding the conventional 5 THz window. These new models predict the amplified spontaneous emission (ASE) noise and the nonlinear distortions arising from the Kerr effect with low-computational complexity due to its semi-analytical formulation. Notably, this thesis presents the first UWB real-time semi-analytical model enabling performance estimation for ultra-low-loss fibres, links with arbitrary span length, and links composed of hybrid amplifiers, i.e., the utilisation of Raman together with rare-earth doped fibre amplifiers. These real-time models are obtained with the utilisation of closed-form expressions, and among its several possible utilisations, are used in this thesis to fasten optimisation algorithms, which enable transmission system designs tailored to suppliers’ requirements; point-to-point and network-throughput maximisation through system parameter optimisation, such as launch power, pump power, and/or pump wavelength allocation; and experiment designs tailored with experimental constraints. Experimental validations of these new closed-form models are presented, enabling to verify and confirm its accuracy in field-deployed systems. Optimisation of optical networks and topology designs using these models are also proposed. Furthermore, a theoretical investigation of the impact of transceiver (TRX) noise on the performance of transmission systems shows that sub-optimal solutions are close to optimum ones, with negligible error, for systems limited by this source of noise.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Modelling and Optimisation of Ultra-wideband Optical Fibre Communication Systems |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2025. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10204491 |
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