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 20 of 73 for “"optical fibres"”.
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Holey optical fibres for high nonlinearity devices
… describes the development of a novel type of optical fibre, namely holey optical fibre (HF), for its specific incorporation in optical devices based on fibre nonlinearity. The development of the fabrication technique to produce such a fibre is discussed, and the fibres produced are …
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Optical frequency comb generation in optical fibres
Optical frequency combs (OFC) constitute an array of phase-correlated equidistant spectral lines with nearly equal intensities over a broad spectral range. The adaptations of combs generated in mode-locked lasers proved to be highly efficient for the calibration of high-resolution (resolving power …
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Direct and inverse design of microstructured optical fibres
Microstructured optical fibres, where an arrangement of air holes running longitudinally along the fibre guides light in either a solid or a hollow core, have created new opportunities in diverse areas of science and technology. Applications range from the generation of supercontinuum light to …
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Lagrangian modelling of nonlinear waves in optical fibres
The Lagrangian perturbation method for the NLS is revisited in the form of an equivalent direct problem. The analogy can be extended to arbitrarily perturbed systems. It is then possible to provide first order perturbation expansions for the fundamental soliton. The case of the damped NLS is …
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Fibre gratings in novel optical fibres for applications in sensing
… the fabrication of fibre gratings in novel optical fibres for sensing applications. Long period gratings have been inscribed into photonic crystal fibre using the electric-arc technique. The resulting sensing characteristics were found to depend on the air-hole geometry of the particular …
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Determining rare earth dopant concentrations in optical fibres and waveguides
The fluorescence lifetimes of rare earth-doped fibres and waveguides were studied in this thesis to determine whether the fluorescence lifetime could be used as a means for determining the rare earth concentrations. The performance of rare earth-doped devices is dependent on many parameters, …
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Deposition of electronic and plasmonic materials inside microstructured optical fibres
Optical fibres are the transport medium of today's digital information. Nowadays, modern optical telecommunication systems make use of semiconductor optoelectronic devices to generate, control and detect light. The union of the two technologies, namely fibre photonics and semiconductor electronics …
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Modelling and experimental investigation of Structured Optical Fibres: Optimisation of drawing conditions
Structured Optical Fibres (SOFs) are the new generation of optical fibres characterised by their air-hole patterns. SOFs are advantageous over conventional optical fibres for their great flexibility in structure design that offers many new features such as significantly extended single-mode regime. …
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Investigation of the loss modes induced in optical fibres during the cabling process
… sources of attenuation which act upon the fibres. The majority of fibres receive a "normal" or average set of attenuation inducements. Despite this, observations of process attenuation increments show that some fibres show a greater increase in attenuation than others. The same levels of …
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Temperature and strain sensing using rare earth fluorescence and Bragg gratings in optical fibres
… on rare earth fluorescence and Bragg gratings in optical fibres. The development and performance of simultaneous temperature and strain measurement systems utilising a combined technique of the fluorescence intensity ratio and the Bragg wavelength shift are investigated.
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Modelling and simulation of light propagation in non-aged and aged step-index polymer optical fibres
Kunststofflichtwellenleiter (POFs) stellen ein verhältnismäßig neues Medium zur optische Datenkommunikation über kurzen Strecken dar. Während ihrer Einsatzdauer unterliegen POFs unterschiedlichen Arten von Umweltbeanspruchungen, hauptsächlich durch hohe Temperatur, hohe Feuchtigkeit und …
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Microscopic characterisation of fibre Bragg gratings
… is the study of microscopic characterization of optical fibres and fibre Bragg gratings, by the use of a non-invasive microscopic technique, namely differential interference contrast microscopy. The thesis aims to provide detailed information on the structural and optical properties of optical …
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Microscopic characterisation of photonic devices
… presented in this thesis sets out to explore the optical properties of optical fibres by means of non-invasive microscopic techniques such as Differential Interference Contrast (DIC) microscopy. It seeks to provide the fibre optic industrial and research community with an alternative tool that is …
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Optical waveguide analysis using transmission lines
Optical fibres have been used as a key medium for telecommunication and networking for more than two decades because in principle they offer sufficient transmission capacity, reaching total rates as high as Tbits/s per fibre. Critical fibre properties such as mode field profiles, single-mode …
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Temperature and strain dependence of fluorescence in praseodymium-doped silica optical fibre
… limit the use of electronic-based sensors, optical fibrebased sensors can be incorporated. In this thesis, praseodymium (Pr3)-doped silica optical fibres were investigated for their temperature and strain properties using the fluorescence lifetime technique. These fibres had a Pr3+-ion …
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Interferometric optical fibre sensor for highway pavements and civil structures
Optical fibres have been used for developing variety of sensing configurations for monitoring a wide range of parameters. This thesis presents the design, construction and characterisation of a new type of single-transducer optical fibre Weigh-ln-Motion (WIM) sensor. The sensor is based on an …
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A theoretical study into the fundamental design limits of devices based on one-and two-dimensional structured fibres
… of the latest key technologies used to produce optical fibre devices for telecommunication system applications. The first technology (fibre Bragg gratings) concerns the 1-dimensional perturbation of the refractive index of an optical fibre (i.e. along the propagation axis of the fibre), whereas …
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