Adaptive Optical OFDM for Local and Access Networks
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Adaptive Optical OFDM for Local and Access Networks Elias Giacoumidis
A Thesis submitted for the degree of Doctor of Philosophy School of Electronic Engineering Bangor University July 2011
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Declaration This work has not previously been accepted in substance for any degree and is not being concurrently submitted in candidature for any degree.
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(Elias Giacoumidis – Candidate)
Unless otherwise stated the work presented in this thesis was carried out solely by the candidate.
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(Prof. Jianming Tang – Supervisor)
Signed
(Elias Giacoumidis – Candidate)
Date (dd/mm/yyyy)
I hereby give consent for my Thesis, if accepted, to be available for photocopying and for inter-library loan, and for the title and summary to be made available to outside organizations.
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(Elias Giacoumidis – Candidate)
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Abstract To satisfy the continuously increasing bandwidth requirements from individual and business end-users, Optical Orthogonal Frequency Division Multiplexing (OOFDM) has been widely considered as one of the strongest contenders for high-speed Local Area Networks (LANs) and Next Generation (NG)-Passive Optical Networks (PONs). The aim of the PhD dissertation research is to extensively explore the feasibility of implementing the OOFDM technique in the aforementioned application scenarios. Special attention is given to investigating the transmission performance of Adaptively Modulated Optical OFDM (AMOOFDM) in cost-sensitive Directly-Modulated DFB Lasers (DML)-based, Intensity-Modulation and Direct-Detection (IM/DD) systems utilising Multi-Mode Fibres (MMFs) or Single-Mode Fibres (SMFs). The impacts of a wide range of different parameters of various components involved in the AMOOFDM modems on the transmission performance of the un-amplified IM/DD AMOOFDM signals are thoroughly explored, in single-channel MMF/SMF systems, and Dense Wavelength Division Multiplexing (DWDM) PON systems. The validity of numerical simulations presented in the thesis is also rigorously verified by comparing with real-time experimental measurements conducted in Bangor University. Following an extensive review of OOFDM operating principles as well as challenges and opportunities of existing transmission techniques associated with LANs and NGPONs, detailed investigations are first undertaken of the impact of Adaptive Cyclic Prefix (ACP) on the transmission performance of AMOOFDM over DML-based, IM/DD systems using both MMFs and SMFs. Three ACP mechanisms are identified, each of which can, depending upon the system properties, affect significantly the I
AMOOFDM transmission performance. In comparison with AMOOFDM having a fixed cyclic prefix duration of 25%, AMOOFDM with ACP can not only improve the transmission capacity by a factor of >2 (>1.3) for >1000m MMFs (2 (>1.3) for >1000m MMFs (
