Yang, Jiaqian;
(2024)
Ultra-wide Band Transmission and Signal Processing in Optical Communication Networks.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
Optical communication networks have been the backbone of global data transmission over the last 40 years. As part of the research into advanced optical data transmission technologies, ultra-wide band (UWB) transmission is studied in this work, focusing on extending the signal bandwidth beyond the conventional (C-) band to achieve higher throughput. Signal processing, as a fundamental technique enabling optical fibre communication, is first investigated, in both digital and optical domains. A novel digital signal processing (DSP) algorithm using a pilot-based adaptive equaliser is proposed which jointly equalises the polarisation-division multiplexing signal and estimates carrier phase. The algorithm is tested in recirculating loop transmission experiments, demonstrating its capability to dynamically mitigate the linear fibre impairments, enabling an increase in the spectral efficiency. In contrast to DSP, optical signal processing enables the manipulation of a signal along the fibre transmission link in the optical domain. This work explores optical phase conjugation systems using a degenerate four-wave mixing configuration, in which pump phase dither is employed to suppress stimulated Brillouin scattering in the highly nonlinear fibre. A DSP-based pump dithering removal algorithm within the receiver is proposed and demonstrated. This provides a solution to wavelength conversion and phase conjugation for fibre nonlinearity compensation in wideband transmission systems. An ultra-wide band transmission transmission system covering short (S-), C-, and long (L-) bands is established using doped fibre amplification and Raman amplification. Using this setup, the accuracy of the interchannel stimulated Raman scattering (ISRS) Gaussian noise (GN) model is assessed through 71 km single-span and 1,065 km recirculating loop transmission experiments in the presence of distributed Raman amplification, and a record throughput of 122.62 Tb/s is achieved in a 223 km unrepeated transmission link.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Ultra-wide Band Transmission and Signal Processing in Optical Communication Networks |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2022. 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/10199265 |
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