Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"single-mode fibre"”.
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High performance photodetectors for multimode optical data links
… of 50 Ym or smaller, suitable for glass multimode or single mode fibre applications. The recent successful commercialisation of very large core diameter plastic optical fibre in systems based around 650 nm emitters, as well as the recent emergence of new polymer materials enabling relatively …
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Inscription of in-fibre photonic devices by an infrared femtosecond laser
… a point by point method for the inscription of fibre Bragg gratings using a tightly focused infrared femtosecond laser is implemented for the first time. Fibre Bragg gratings are wavelength-selective, retro-reflectors which have become a key component in optical communications as well as …
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40Gbit/s dispersion managed soliton transmission
… is given on the propagation of pulses in optical fibres before extending the arguments to optical solitons, their applications and uses in communications. Dispersion management for transmission systems is introduced and then a brief explanation of quasi-linear pulse propagation is given. …
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Interrogation of fibre optic sensors
… thesis was to investigate the interrogation of fibre optic sensors using "off the shelf optical components and equipment developed mainly for the telecommunications industry. This provides a cost effective way of bringing fibre optic sensor systems to within the price range of their …
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Optical fiber temperature sensor based on fiber bragg grating
… essential to establish the smallest distance of single mode fibre in order to reduce optical losses of the FBG system. One of the most generally used deployed optical sensors is the fiber Bragg grating, with optical circulator, ASE source and OSA, the FBG which reflects a wavelength of light that …
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High speed optical communication systems: From modulation formats to radically new fibres
… 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 …
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Dynamically reconfigurable long-reach PONs for high capacity access
Fibre-to-the-Premises (FTTP) is currently seen as the ultimate in high-speed transmission technologies for delivering ubiquitous bandwidth to customers. However, as the deployment of network infrastructure requires a substantial investment, the main obstacle to fibre deployment is that of financial …
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Time-Frequency Localisation of Distributed Brillouin Optical Time Domain Reflectometry
Distributed fibre optic sensing (DFOS) is essential for structural health monitoring (SHM) of strain changes induced during the lifetime of a structure. Among different DFOS systems, the Brillouin Optical Time Domain Reflectometry (BOTDR) takes the advantages of obtaining full frequency spectrum to …
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Nonlinearly regenerated long haul data transmission
… the use of different techniques for optical fibre transmission over ultra long haul distances. Its format firstly examines the use of dispersion management as a means of achieving long haul communications. Secondly, examining the use concatenated NOLMs for DM autosoliton ultra long haul …
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Femtosecond laser writing in transparent materials
Optical waveguides (type-I), with perfect mode matching to the standard single-mode fibre and with an overall insertion loss of ~1 dB, have been demonstrated in high index bismuth borate glass by femtosecond laser direct writing. Broadening of the transmitted light source by as much as 500 nm was …
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A single ion inside a miniature cavity
… the first experimentally achieved coupling of a single atomic ion to an optical fibre-cavity as well as the first photonic interaction between a single ion and a single semiconductor quantum dot. The newly developed apparatus stores a single Yb+ ion in a radio-frequency Paultrap. There the ion is …
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High Speed Optical Links Using CAP Modulation and Novel Equalisation Techniques
… systems including OM4 based and plastic optical fibre (POF) based links. An 850 nm VCSEL based OM4 link using CAP-16 scheme is studied. For the first time, the CAP equaliser, is proposed to mitigate both crosstalk channel interference (CCI) and ISI in the link at the receiver side. Performance …
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High-Definition Holographic Head-Up Displays
… rates worldwide. Current display advances in modern vehicles increase the risk of driver distraction and endanger safety. Conventional head-up displays require the driver to shift the field of view from the far field of the road towards a small region on the windscreen. Holographic 3D Head-Up …
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Optical micro- and nanofibres: Higher mode generation and particle manipulation studies
… experimental fields of optical micro- and nanofibre research; higher mode generation/excitation and evanescent field optical manipulation. Standard, commercial, single-mode silica fibre is used throughout most of the experiments; this generally produces high-quality, single-mode, micro- or …
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Network Integration of a Quantum Dot Entangled Photon-pair Source
… far from being used in an established standard fibre network. On the one hand, most of the sources are still operated in an environment that requires the installation of bulky laser setups, preventing their integration in a network. On the other hand, most of the experiments on entangled qubits …
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High-power cladding-pumped Raman and erbium-ytterbium doped fibre sources
Raman fibres and rare-earth doped silica fibres have been investigated for many years as gain media for the amplification of optical signals in telecommunications thanks to their broad gain bandwidth. They are now widely used for that application. It is only recently that power scaling of fibre …
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Finite element characterisation of photonic crystal fibres
… bending and leakage losses of Photonic Crystal Fibres (PCF). A modal solution approach including the implementations of the conformal transformation and the Perfectly Matched Layer (PML) were undertaken to determine the bending and leakage losses of several designs of Photonic Crystal Fibres. …
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Optical frequency comb generation in optical fibres
… range. The adaptations of combs generated in mode-locked lasers proved to be highly efficient for the calibration of high-resolution (resolving power > 50000) astronomical spectrographs. The observation of different galaxy structures or the studies of the Milky Way are done using instruments …
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Novel mechanical alignment and component fabrication for wavelength-selective optical switches
… the input and output ports. Both conventional single-mode fibres and waveguides fabricated with ultrafast-laser inscription (ULI) are investigated. The ULI waveguide technology is verified as an enabling technology for the volume manufacture of two-dimensional WSSs. The second key task is the …