Zou, Lei;
(2024)
Coupled Optoelectronic Oscillator based
on Mode-locking Laser for 5G Wireless
Networks and Beyond.
Masters thesis (M.Phil), UCL (University College London).
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Abstract
As the microwave signal processing by photonic techniques, the microwave photonic emerge numerous distinct advantages including ultra-high-frequency, large bandwidth, anti-electromagnetic field interference and low transmission loss. As a representative microwave photonic system, the optoelectronic oscillator (OEO) that can generate the radio frequency (RF) signals with excellent performance in terms of phase noise, oscillating frequency and stability. As one of the key elements in wireless networks, the local oscillator (LO) needs to operate at millimetre-wave (30GHz-300GHz) and THz (300GHz-10THz) band with lower phase noise, which becomes a major challenge for fifth generation (5G) wireless network and beyond. Thus, the OEO is greatly desired for LO in 5G wireless network and beyond. The thesis introduces three OEO systems predicated on integrated devices designed to produce microwave signals characterized by high frequency, low phase noise, and tunability. The subsequent sections provide an in-depth elucidation of the primary content and innovations presented in the thesis. Three OEO schemes, leveraging photonic integrated circuit (PIC) technology, are posited to generate microwave signals featuring high frequency, low phase noise, and tunability. The initial proposal involves a single-loop OEO utilizing a mode-locked laser (MLL) chip. The narrow-band gain spectrum of the MLL chip is harnessed to achieve stable oscillation in a single mode, resulting in the generation of a microwave signal with a frequency tuning range of 23.91-24.71 GHz and an optimal phase noise of -80 dBc/Hz (@10 kHz). (Chapter 3) Subsequently, a dual-loop OEO system is introduced, incorporating an extended feedback loop. To enhance phase noise and mitigate suppression ratio, a dual-loop coupled OEO employing the vernier effect is advanced. This configuration yields a tunable microwave signal with a frequency range from 23.68 GHz to 24.82 GHz, achieving a superior phase noise of -100 dBc/Hz (@10 kHz) and a side mode suppression ratio exceeding 40 dB. (Chapter 3) In pursuit of further phase noise reduction and scheme simplification, an OEO based on parity-time symmetry is proposed, employing the MLL chip. This arrangement results in the generation of a tunable microwave signal within the range of 24–25 GHz, with a phase noise measuring below -108 dBc/Hz (@10 kHz). (Chapter 4) This MPhil. project aims to propose integrated OEO with low power consumption and cost. This dissertation summarises the progress that has been made as far as so on and discusses the plan of further studies.
| Type: | Thesis (Masters) |
|---|---|
| Qualification: | M.Phil |
| Title: | Coupled Optoelectronic Oscillator based on Mode-locking Laser for 5G Wireless Networks and Beyond |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2024. 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 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/10188793 |
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