Jin, Cenqin (2023) Advanced modelling and signal processing in nonlinear coherent optical fibre systems. PhD thesis, University of Warwick.
Preview |
PDF
WRAP_Theses_Jin_2023.pdf - Submitted Version - Requires a PDF viewer. Download (10MB) | Preview |
Abstract
The importance of optical fibres in the global information society has increased significantly over the past four decades. However, the ever-growing demand for high-capacity data transmission poses a significant challenge, as the fibre channel’s nonlinear properties limit the achievable capacities, spectral efficiencies, and distances. This thesis aims to address this challenge by investigating advanced modelling and signal processing in nonlinear coherent optical fibre systems to predict and improve overall system performance. The first part of the thesis examines the effectiveness of nonlinear compensation (NLC) techniques, such as digital back-propagation (DBP) and optical phase conjugation (OPC), in enhancing achievable information rates (AIRs) in C-band systems that use both EDFA and distributed Raman amplification. Results indicate that the effectiveness of NLC techniques in enhancing AIRs depends heavily on the signal modulation formats and target transmission distances, with NLC being more effective for higher-order modulation formats at shorter system distances. The second part investigates the performance of long-haul Nyquist-spaced wavelength division multiplexing (WDM) optical communication systems with electronic dispersion compensation (EDC) and digital NLC with significant laser linewidths, and presents an analytical model based on the Gaussian noise model to predict the system performance considering the impact of equalisation enhanced phase noise (EEPN). A reduction up to 1.41 dB in SNR was observed in a 32-GBd 2000- km 5-channel system using NLC due to EEPN. This thesis also conducts a comprehensive analysis to study the performance of Kalman filter (KF) under realistic long-haul optical link conditions. The effectiveness of the KF in mitigating phase distortions has been thoroughly analysed. Numerical simulations were conducted on both dispersion-unmanaged and dispersion-managed nonlinear long-haul transmission systems. The joint application of KF and NLC significantly improved system performance, achieving approximately 4 dB higher SNRs than pilot-aided CPE. The findings of this thesis could help advance the design of nonlinear coherent optical fibre systems influenced by laser phase noise for high-capacity data transmission.
| Item Type: | Thesis [via Doctoral College] (PhD) |
|---|---|
| Subjects: | Q Science > Q Science (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering |
| Library of Congress Subject Headings (LCSH): | Optical fiber communication, Data transmission systems, Signal processing, Random noise theory -- Mathematical models, Back propagation (Artificial intelligence) |
| Official Date: | May 2023 |
| Dates: | Date Event May 2023 UNSPECIFIED |
| Institution: | University of Warwick |
| Theses Department: | School of Engineering |
| Thesis Type: | PhD |
| Publication Status: | Unpublished |
| Supervisor(s)/Advisor: | Xu, Tianhua ; Chen, Yunfei |
| Format of File: | |
| Extent: | xxiv, 179 pages : illustrations, maps |
| Language: | eng |
| URI: | https://wrap.warwick.ac.uk/183251/ |
Request changes or add full text files to a record
Repository staff actions (login required)
 |
View Item |