Rozprawy doktorskie na temat „Optical”
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Hrůza, Libor. "Koherentní analogové zpracování optické informace". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217466.
Pełny tekst źródłaFilip, Tomáš. "Model optické sítě pro vysokorychlostní datové přenosy". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219446.
Pełny tekst źródłaKřivák, Petr. "Optické bezkabelové spoje s velkým dosahem". Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233453.
Pełny tekst źródłaStibůrek, Miroslav. "Miniaturní optovláknový senzor teploty pro magnetickou rezonanci". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-401006.
Pełny tekst źródłaVettenburg, Tom. "Optimal design of hybrid optical digital imaging systems". Thesis, Heriot-Watt University, 2010. http://hdl.handle.net/10399/2438.
Pełny tekst źródłaHampl, Martin. "Prostorové dělení optických svazků". Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233502.
Pełny tekst źródłaAladeloba, Abisayo Olufemi. "Optically amplified free-space optical communication systems". Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13304/.
Pełny tekst źródłaLiu, Jingjing. "Optically powered transceiver for optical wireless communications". Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509980.
Pełny tekst źródłaKubica, Matěj. "Optický polygon". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442372.
Pełny tekst źródłaHao, Miin-Jong. "Performance evaluation of practival FSK, CPFSK, and ASK detection schemes for coherent optical fiber communication systems". Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/15686.
Pełny tekst źródłaParker, Matthew. "Optical Tamm states for novel optical and quantum optical devices". Thesis, University of Bristol, 2019. http://hdl.handle.net/1983/111ef532-59fa-49f6-a770-acb3003caf7f.
Pełny tekst źródłaAgnew, Amalia. "Quantum-Chemical Investigations of Second- and Third-Order Nonlinear Optical Chromophores for Electro-Optic and All-Optical Switching Applications". Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11575.
Pełny tekst źródłaBaker, Stephen. "Optimal determination of the optical coefficients from scattering media". Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268794.
Pełny tekst źródłaGeykhman, Roman. "Optimal placement of binary actuators in deformable optical systems". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67794.
Pełny tekst źródłaCataloged from PDF version of thesis.
Includes bibliographical references (p. 111-113).
Recently, exploration has been conducted into the applicability of binary mechatronics to active figure correction in large optical systems such as space telescopes and ground-based solar-thermal concentrators. This Thesis will continue this exploration. The information-theoretic requirements of the corrective commands required in active optics will be explored to understand the dimensionality of the continuous workspace sampled by binary actuation. In both the minimal expected error and the minimal computation time sense, the optimal discrete workspace is the uniform discrete distribution. A rigorous analogy between binary mechatronics and discrete random variables will be used to show that this optimal workspace is achievable by a linear superposition of actuators with exponentially decreasing influences on the optical surface. It will be proven that elasticity can be exploited to construct mechanisms where constant magnitude actuators exhibit exponentially decaying influences on certain parts of the mechanism, allowing for designs where individual binary actuators correspond to binary bits of the required deformation. A planar truss mechanism designed with this philosophy will be presented and shown to have independent kinematic control of multiple adjacent displacements on its top side. Finally, this design will be shown extend to three dimensions in a manner applicable to optical figure correction. Due to the complexity of mechanisms that meet the optimality criteria, only theoretical analysis will be presented.
by Roman Geykhman.
S.M.
Valle, Brent. "Design of Multilayer Optical Media: Organic Photovoltaics and Optical Data Storage". Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1364917393.
Pełny tekst źródłaTakayanagi, Jun, Norihiko Nishizawa, Hiroyuki Nagai, Makoto Yoshida i Toshio Goto. "Generation of high-power femtosecond pulse and octave-spanning ultrabroad supercontinuum using all-fiber system". IEEE, 2005. http://hdl.handle.net/2237/6770.
Pełny tekst źródłaJi, Zheng. "The Use of Optical Metrology in Active Positioning of a Lens". Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699892/.
Pełny tekst źródłaMaleev, Ivan. "Partial coherence and optical vortices". Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0713104-021808/.
Pełny tekst źródłaSimpson, Neil B. "Optical spanners and improved optical tweezers". Thesis, University of St Andrews, 1998. http://hdl.handle.net/10023/14884.
Pełny tekst źródłaBOSCO, ALESSIO. "All-Optical Processing by Second Order Nonlinearities". Doctoral thesis, La Sapienza, 2005. http://hdl.handle.net/11573/916893.
Pełny tekst źródłaDiamond, Cornelius. "OMOS : optically written micro-optical systems in photopolymer /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9963665.
Pełny tekst źródłaBalon, Jiří. "Měřící metody klíčových parametrů v optických sítích". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218247.
Pełny tekst źródłaHašek, Jaroslav. "Laserový vysílač s optickým vláknem". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217799.
Pełny tekst źródłaWang, Lon A. "Optical computing using interference filters as nonlinear optical logic gates and holographic optical elements as optical interconnects". Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184502.
Pełny tekst źródłaSemenets, V. V., M. V. Neofitnyy, Yu P. Machekhin, O. S. Hnatenko, V. I. Zarytskyi i S. V. Gulak. "Laser system for recording optics". Thesis, CAOL, 2019. http://openarchive.nure.ua/handle/document/15098.
Pełny tekst źródłaPark, Seung-Han. "Excitonic optical nonlinearities in semiconductors and semiconductor microstructures". Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184551.
Pełny tekst źródłaFragemann, Anna. "Optical parametric amplification with periodically poled KTiOPO4". Doctoral thesis, KTH, Laserfysik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-531.
Pełny tekst źródłaQC 20101013
An, Dechang. "Electro-optic polymer-based monolithic waveguide devices with multi-functions of amplification switching and modulation". Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3035933.
Pełny tekst źródłaAtabaki, Amir Hossein. "Reconfigurable silicon photonic devices for optical signal processing". Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41207.
Pełny tekst źródłaYazdani, Arash. "Contributions to optimal detection in OTDM and OCDMA optical receivers". Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/398408.
Pełny tekst źródłaLos sistemas de comunicaciones ópticas aumentan constantemente su rendimiento. La disponibilidad de fibras con muy baja atenuación, láseres de alta pureza espectral y amplificadores ópticos, entre otros, hacen factible el transporte de Tbit/s a miles de kilómetros, de una manera más fiable, segura y eficiente que los sistemas basados en radiofrecuencia. Una nueva generación de redes ópticas de acceso, tales como EPON y GPON, ya están proporcionando conectividad a Gbit/s en los mercados tanto empresarial y de consumo, lo que permitirá sostener la creciente demanda de los usuarios. El principal objetivo de los investigadores en el campo de las redes ópticas es aumentar la velocidad de transmisión de datos, explotando el comportamiento intrínsecamente rápido del dominio óptico. En este contexto, el procesado de la señal en el dominio óptico es una tecnología clave para la construcción de redes fotónicas manteniendo su simplicidad y el bajo coste de operación, así como la independencia del formato de la información. Para conseguirlo, hay obstáculos a superar, como el problema del mantenimiento de la sincronía extremadamente precisa que es necesaria en redes sin conversión electro-óptica. Otro problema es la recuperación de la sincronía en los detectores de los receptores usados en las técnicas OTDM y OCDMA, donde incluso los fotodetectores más rápidos no son capaces de separar los datos del usuario deseado de las señales de los usuarios adyacentes. La detección de pulsos ultracortos en presencia de la interferencia debida al acceso múltiple (MAI) es un reto importante. Por ello es vital aplicar procesado óptico en la señal recibida, antes de la fotodetección. Una técnica efectiva para realizar la detección es el uso de una puerta óptica en el receptor, con el fin de extraer la señal del usuario deseado. Esto requiere recuperar por procedimientos puramente ópticos la señal de reloj. Pero al aumentar la velocidad de transmisión, la precisión de la recuperación de reloj disminuye debido al aumento de la fluctuación de fase (jitter) y la MAI, y en consecuencia el rendimiento del sistema se degrada. Actualmente, el enfoque usado es usar un reloj con el mismo ancho de pulso que la señal de datos útiles, pero cuando la fluctuación de fase es grande, esta técnica falla al no capturar correctamente la parte principal de la señal de datos y recoger una mayor interferencia. Forzando estas técnicas a trabajar a velocidades inferiores a las potenciales para evitar que la tasa de errores (BER) se dispare. Este trabajo logra una mayor relación señal a ruido (y por tanto, una BER inferior) respecto el caso de las señales con duración fija del pulso de reloj. Se han analizado las características de las tecnologías OTDM y OCDMA, proponiendo un modelo analítico detallado, y se ha aportado una solución para mejorar el rendimiento de los receptores ópticos, utilizando un medio no lineal (Four Wave Mixing) como combinador en los receptores. Se ha modelado analíticamente la relación entre la entrada y la salida en un medio no lineal, mediante técnicas que utilizan las ecuaciones de Schrödinger, solucionadas mediante series de Volterra. Los modelos analiticos de la respuesta del receptor óptico se han validado con simulaciones, teniendo en cuenta el efecto de la variación del ancho de banda del reloj en el rendimiento de los receptores, con presencia de fluctuación de fase. Se ha obtenido el valor óptimo del ancho de banda de la señal de reloj, y se ha comprobado que los resultados de la teoría y la simulación coinciden. Los resultados obtenidos permiten incrementar la velocidad de transmisión de datos en redes ópticas manteniendo la BER, o bien obtener una BER más baja para el mismo nivel de jitter
Priyadarshi, Sanjay. "Optimal operating conditions and security considerations for optical chaos communications". Thesis, Bangor University, 2013. https://research.bangor.ac.uk/portal/en/theses/optimal-operating-conditions-and-security-considerations-for-optical-chaos-communications(63997d52-0808-47b1-a995-64e4dfebd099).html.
Pełny tekst źródłaLEE, YONG HEE. "ROOM-TEMPERATURE OPTICAL NONLINEARITIES IN GALLIUM-ARSENIDE AND FAST OPTICAL LOGIC GATES". Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183920.
Pełny tekst źródłaJedrkiewicz, Ottavia. "Theories of atom-field interaction in cavities and retrodiction for quantum communications". Thesis, University of Essex, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340589.
Pełny tekst źródłaHaris, Muhammad. "Advanced modulation formats for high-bit-rate optical networks". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24811.
Pełny tekst źródłaCommittee Chair: Chang, Gee-Kung; Committee Co-Chair: Yu, Jianjun; Committee Member: Altunbasak, Yucel; Committee Member: Ji, Chunayi; Committee Member: Ralph, Stephen; Committee Member: Xu, Jun.
Lee, Woei Ming. "Optical trapping : optical interferometric metrology and nanophotonics". Thesis, St Andrews, 2010. http://hdl.handle.net/10023/882.
Pełny tekst źródłaGalloway, Peter Colin McLaren. "Holographic optical elements for optical fibre application". Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389195.
Pełny tekst źródłaThakulsukannant, Kornkamol. "Advanced optical switching technology for optical networking". Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500403.
Pełny tekst źródłaBristow, Julian Paul Gregory. "Integrated optical components for optical fibre sensors". Thesis, University of Glasgow, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329519.
Pełny tekst źródłaHead, Christopher Robin. "Optical trapping and optical sources for nanophotonics". Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/359888/.
Pełny tekst źródłaMcDonald, Mark Edmund. "Optical engineering of parallel optical data storage". Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/289037.
Pełny tekst źródłaLe, Dinh Danh. "All-Optical Multicast Routing under Optical Constraints". Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS214/document.
Pełny tekst źródłaOver the past decade, network traffic levels experienced an explosive growth at about double amount in approximately every thirty months. The sources accounting for this growth come from numerous high-speed applications (e.g., video-on-demand, high-definition television) which involve the data transmission in multicast groups. To realize optical multicasting, optical routers should have light splitters to split light signals and wavelength converters to change the wavelengths wherever needed. However, the splitting reduces the energy of the output signal which in turn requires the costly power amplification or regeneration. Wavelength converters are also immature to be deployed widely in current optical technologies. Consequently, in all-optical networks, routers are often heterogeneous in their processing units, which challenges the routing. Therefore, it is crucial to design efficient multicast routing strategies at the backbone optical networks, in order to achieve cost-performance tradeoff solutions while satisfying the ever-increasing bandwidth demands and optical constraints.In this thesis, we investigate the all-optical multicast routing (AOMR) problems in heterogeneous optical networks. The heterogeneity mainly comes from the absence/presence of light splitters and wavelength converters and the uneven distribution of wavelengths in the network links. In general, AOMR problems are often NP-hard. The objective of the thesis is to analyze and formulate the problems, to search for the optimal solutions, and to propose efficient heuristics to solve the problems under different optical constraints. Both possible contexts, i.e., single-multicast request and multiple-multicast requests, are examined. All the reported results in the thesis are supported by extensive and careful simulations. The major contributions can be summarized as follows.1) We identify the optimal route structures for AOMR problems under heterogeneous mesh WDM networks. As shown in the thesis, the optimal solutions are no longer based on conventional light-trees, but a more general tree-like structure called hierarchy. Some forms of hierarchy realized for WDM multicasting are light-trails, light-hierarchies, light-spider hierarchies and a set of these light-structures. The exact and heuristic algorithms proposed in the thesis are mainly based on hierarchy. 2) For single-multicast with sparse-splitting case, we propose an efficient heuristic algorithm to produce a good tradeoff solution among wavelength consumption, channel total cost and end-to-end delay.3) For single-multicast with non-splitting case, we prove the NP-hardness, identify the optimal solution as a set of light-spider hierarchies, formulate the problems by means of Integer Linear Program (ILP) formulations to find the exact solution, and propose several cost-effective heuristic algorithms to compute the approximate solutions. 4) For the case with multiple-multicast requests, we focus on static traffic patterns under sparse-splitting without wavelength conversion case. First, an ILP formulation based on light-hierarchies is proposed to search for the optimal solution. By applying the layered graph model, we then develop several adaptive heuristic algorithms to compute light-hierarchies for approximate solutions. These adaptive algorithms outperform the existing fixed routing ones in minimizing the blocking probability. Overall, the thesis points out that the optimal solutions for heterogeneously constrained AOMR problems correspond to hierarchies, regardless of request multiplicity consideration
Fragemann, Anna. "Optical parametric amplification with periodically poled KTiOPO4". Doctoral thesis, KTH, Physics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-531.
Pełny tekst źródłaThis thesis explores the use of engineered nonlinear crystals from the KTiOPO4 (KTP) family as the gain material in optical parametric amplifiers (OPAs), with the aim to achieve more knowledge about the benefits and limitations of these devices. The work aims further at extending the possible applications of OPAs by constructing and investigating several efficient and well performing amplifiers.
An OPA consists of a strong pump source, which transfers its energy to a weak seed beam while propagating through a nonlinear crystal. The crystals employed in this work are members of the KTP family, which are attractive due to their large nonlinear coefficients, high resistance to damage and wide transparency range. The flexibility of OPAs with respect to different wavelength regions and pulse regimes was examined by employing various dissimilar seed and pump sources.
The possibility to adapt an OPA to a specific pump and seed wavelength and achieve efficient energy conversion between the beams, originates from quasi-phasematching, which is achieved in periodically poled (PP) nonlinear crystals. Quasi-phasematched samples can be obtained by changing the position of certain atoms in a ferroelectric crystal and thereby reversing the spontaneous polarisation.
In this thesis several material properties of PP crystals from the KTP family were examined. The wavelength and temperature dispersion of the refractive index were determined for PP RbTiOPO4, which is essential for future use of this material. Another experiment helped to increase the insight into the volumes close to domain walls in PP crystals
Further, several OPAs were built and their ability to efficiently amplify the seed beam without changing its spectral or spatial properties was studied. Small signal gains of up to 55 dB and conversion efficiencies of more than 35 % were achieved for single pass arrangements employing 8 mm long PPKTP crystals. Apart from constructing three setups, which generated powerful nanosecond, picosecond and femtosecond pulses, the possibility to amplify broadband signals was investigated. An increase of the OPA bandwidth by a factor of approximately three was achieved in a noncollinear configuration.
Pavlů, Michal. "Modelování vícekanálového optického bezkabelového spoje". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219817.
Pełny tekst źródłaZheng, Xing. "Advanced Optical OFDM transceivers for Optical Access Networks". Thesis, Bangor University, 2011. https://research.bangor.ac.uk/portal/en/theses/advanced-optical-ofdm-transceivers-for-optical-access-networks(cdd26537-a8c0-4df1-84e3-7baa55b20fb4).html.
Pełny tekst źródłaTariq, Sana. "Inside all-optical networks /". Online version of thesis, 2009. http://hdl.handle.net/1850/10960.
Pełny tekst źródłaRozas, David. "Generation and Propagation of Optical Vortices". Digital WPI, 1999. https://digitalcommons.wpi.edu/etd-dissertations/348.
Pełny tekst źródłaTomljenovic-Hanic, Snjezana. "Propagation effects in optical waveguides, fibres and devices /". View thesis entry in Australian Digital Theses Program, 2003. http://thesis.anu.edu.au/public/adt-ANU20040921.104741/index.html.
Pełny tekst źródłaLiang, Yu, i 梁羽. "Versatile photonic processor based on fiber optical parametric amplifiers". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43085362.
Pełny tekst źródłaLiang, Yu. "Versatile photonic processor based on fiber optical parametric amplifiers". Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B43085362.
Pełny tekst źródłaAgapiou, George S. "Mode index transitions in planar optical waveguides". Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/15404.
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