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1 E-thesis on CORA only Please note that Chapter 1 (pp.1-9) is unavailable indefinitely due to a restriction requested by the author. Not applicable This thesis contains third party copyrighted materials for which permission was not given for online use Morrison, Alan P. Gunning, Fatima C. Garcia Ellis, Andrew D. Mac Suibhne, Naoise C. Science Foundation Ireland European Commission 2015-08-12T11:52:30Z 2015-08-12T11:52:30Z 2014 2014 High volumes of data traffic along with bandwidth hungry applications, such as cloud computing and video on demand, is driving the core optical communication links closer and closer to their maximum capacity. The research community has clearly identifying the coming approach of the nonlinear Shannon limit for standard single mode fibre [1,2]. It is in this context that the work on modulation formats, contained in Chapter 3 of this thesis, was undertaken. The work investigates the proposed energy-efficient four-dimensional modulation formats. The work begins by studying a new visualisation technique for four dimensional modulation formats, akin to constellation diagrams. The work then carries out one of the first implementations of one such modulation format, polarisation-switched quadrature phase-shift keying (PS-QPSK). This thesis also studies two potential next-generation fibres, few-mode and hollow-core photonic band-gap fibre. Chapter 4 studies ways to experimentally quantify the nonlinearities in few-mode fibre and assess the potential benefits and limitations of such fibres. It carries out detailed experiments to measure the effects of stimulated Brillouin scattering, self-phase modulation and four-wave mixing and compares the results to numerical models, along with capacity limit calculations. Chapter 5 investigates hollow-core photonic band-gap fibre, where such fibres are predicted to have a low-loss minima at a wavelength of 2μm. To benefit from this potential low loss window requires the development of telecoms grade subsystems and components. The chapter will outline some of the development and characterisation of these components. The world's first wavelength division multiplexed (WDM) subsystem directly implemented at 2μm is presented along with WDM transmission over hollow-core photonic band-gap fibre at 2μm. References: [1]P. P. Mitra, J. B. Stark, Nature, 411, 1027-1030, 2001 [2] A. D. Ellis et al., JLT, 28, 423-433, 2010. Science Foundation Ireland (SFI Grant 06/IN/I969); European Commission (EU 7th Framework Programme under grant agreement 258033 (MODE-GAP)) Not peer reviewed Accepted Version application/pdf Mac Suibhne, N. 2014. High speed optical communication systems: From modulation formats to radically new fibres. PhD Thesis, University College Cork. 142 https://hdl.handle.net/10468/1895 en University College Cork © 2014, Naoise Mac Suibhne. http://creativecommons.org/licenses/by-nc-nd/3.0/ Photonics Fiber PS QPSK Optical communications High speed communication Optical fibre Novel optical fibre Optical fibre communications Space division multiplexing Hollow core fibre Few mode fibre Multimode fibre Fibre nonlinearity Optical modulation formats Modulation formats false High speed optical communication systems: From modulation formats to radically new fibres Doctoral thesis Doctoral PHD (Engineering) a.morrison@ucc.ieinfo:eu-repo/semantics/openAccess