Tesis sobre el tema "GBIB"
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TUOHETI, ABUDUWAILI. "Smart Embedded Systems for Biomedical Applications". Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2742529.
Texto completoNunez, Yanez Jose Luis. "Gbit/second lossless data compression hardware". Thesis, Loughborough University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392516.
Texto completoVorbeck, Sascha. "Systementwurf von optischen Übertragungsstrecken mit 160 Gbit-s Kanaldatenrate". Aachen Shaker, 2008. http://d-nb.info/989186458/04.
Texto completoPapiani, Mark. "An architecture for management of large, distributed, scientific data". Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326305.
Texto completoMolina, Cyntia Virolli Cid. "Interoperabilidade entre o modelo de dados do Taxonomic Data Working Group (TDWG) e tags do OpenStreetMap para a espécie Sotalia Guianensis". Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/100/100136/tde-20062016-143349/.
Texto completoThe absence of data standardization may result in loss of information of major importance through several areas of knowledge, hindering data integration among different information systems or databases, that is, the data may not be interoperable. The solution for data integration may be called interoperability, which is comprised of conventions, data format standards (file extensions) and ontologies (standards), empowering the communication among information systems. A biodiversity database is a very important tool for biodiversity conservation initiatives, being useful for knowledge transfer, historical data storage among other activities. This work developed a methodology for interoperate data between the Taxonomic Data Working Group (TWDG) standard and OpenStreetMap (OSM) tags on Sotalia guianensis species, as known as Guiana dolphin. This work has its motivation scenario on the fact that the Guiana dolphin is under threat of extinction. This scenario demands the development of methodologies for the publication of the locations where the Guiana dolphin is being spotted over the biodiversity databases and the development of a methodology for interoperability among biodiversity databases as well as Geographic Information Systems (SIG). This study proposes a low cost methodology, which uses open-source platforms and focuses on two main goals: avoidance of taxonomical problems on biodiversity spatial data modelling and to provide the biodiversity spatial data to the population in general. This work proves itself innovative by integrating Global Diversity Information Facility (GBIF) data with OSM tags, allowing a free and standardized registry of data in an open-source global-scale platform by using an interoperable tag of equivalence data between the TDWG standard and OSM tags. The result of this study is the methodology for data modelling and publication of the Guiana dolphin on GBIF and OSM in an interoperable manner, which has been implemented, tested and gave positive results
Vorbeck, Sascha [Verfasser]. "Systementwurf von optischen Übertragungsstrecken mit 160 Gbit/s Kanaldatenrate / Sascha Vorbeck". Aachen : Shaker, 2008. http://d-nb.info/1162791454/34.
Texto completoAguilar-Torrentera, Jorge. "Transversal filter MMIC design for multi-Gbit/s optical CDMA systems". Thesis, University College London (University of London), 2004. http://discovery.ucl.ac.uk/1446500/.
Texto completoCaillaud, Christophe. "Photorécepteur intégré SOA-PIN pour les applications à 100 Gbit/s". Paris, Télécom ParisTech, 2010. http://www.theses.fr/2010ENST0057.
Texto completoThis work focuses on the design and fabrication of high speed photodiodes and their integration with a semiconductor optical preamplifier for short reach 100 gbit/s links. The first section of this study is dedicated to the optimization of an utc photodiode for 100 gbit/s links. Due to the implementation of an electric field in the absorption layer, owing to a gradual doping, and the optimization of a multimode waveguide, a high responsivity (0,6 A/W at 1,55 µm), an ultra wide 3-dB bandwidth (>120 ghz) and a high saturation current (20 MA at 50 GHz) are simultaneously achieved. Secondly, the study of shallow ridge soa and their comparison with buried soa show the advantages of BRS soa to realize an integrated SOA-PIN. The design of the integrated component is then presented and its technology is described. Finally, the SOA-PIN characterization demonstrates simultaneously a high responsivity 88 A/W), a low polarization dependence (<1 dB), a low noise factor (8. 5 dB) and a wide 3-dB bandwidth (≈65 ghz), which put our components at the best state of the art level. Simulations show our receivers would present a 40 Gbit/s sensivity improved by 2 dB as compared to competitors which demonstrate receivers with high noise factor soa. At 100 Gbit/s, the soa-pin would reach a high sensitivity of -18 dbm
Song, Indal. "Multi-Gbit/s CMOS Transimpedance Amplifier with Integrated Photodetector for Optical Interconnects". Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4902.
Texto completoSlovak, Juraj. "Semiconductor based architectures for all-optical 3R signal regeneration at 40 Gbit/s". [S.l.] : [s.n.], 2006. http://opus.kobv.de/tuberlin/volltexte/2006/1429.
Texto completoKieckbusch, Sven. "Simultane adaptive Kompensation von chromatischer Dispersion und Polarisationsmodendispersion in 160 Gbit/s-Übertragungssystemen". Göttingen Cuvillier, 2008. http://d-nb.info/994167504/04.
Texto completoNory, Ravikiran. "Performance Analysis of Space-Time Coded Modulation Techniques using GBSB-MIMO Channel Models". Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/33449.
Texto completoMaster of Science
Chaouch, Hacène Mahieddine. "Advanced Modulation Formats and All-Optical Processing Solutions for Future Fiber-Optic Communication Systems". Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202987.
Texto completoFerber, Sebastian Eberhard. "Faseroptische Datenübertragung mit differentieller Phasenmodulation und optischer Zeitmultiplextechnik bei 160 Gbit/s und darüber". [S.l.] : [s.n.], 2007. http://opus.kobv.de/tuberlin/volltexte/2007/1557.
Texto completoGu, Zheng [Verfasser]. "High Speed CMOS ICs for 10 Gbit/s Optical Fiber Communication Receivers / Zheng Gu". Aachen : Shaker, 2005. http://d-nb.info/1186588381/34.
Texto completoGuérin, A., G. Lesthievent y J. L. Issler. "Telemetry Architectures for Future Earth Observation Missions: Over 1 Gbit/s in X-Band". International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/605933.
Texto completoHigh data rate payload telemetry of Earth Observation missions is classically done in the Earth Exploration Satellite (EES) X-band (8025-8400 MHz) with current max data rates about 600 Mbit/s. While higher frequency bands are often considered to offer higher data rates, this paper deals with on-board architectures that would allow data transmission at more than 1 Gbit/s in X-Band. It presents these new architectures based on spectrally efficient transmission systems and on simultaneous bipolarization transmission, their designs and their performances. Variable Coding and Modulation techniques are described. Interference between channels in cross-polarization is also evaluated.
Kako, Maria Margaret. "Amplificador faixa larga com mesfet de GaAS para sistemas de até 1,5 Gbit/s". Instituto Tecnológico de Aeronáutica, 1989. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=1871.
Texto completoElfaiki, Hajar. "Transceivers cohérents intégrant des lasersIII-V sur silicium pour lestransmissions à 400 Gbit/s". Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASO003.
Texto completoCoherent transceivers have become established in long-distance fibre-optic transmission systems over the last ten years or so due to the explosion in data traffic. Fibres are now being introduced in metropolitan networks and data centre connections. Currently, research is very active to develop coherent integrated transmitters and receivers with low cost, low power consumption and small size, with regular announcements of new records in terms of integration density and transmission capacity. This thesis is fully in line with the development of integrated photonic circuits for optical telecommunications applications.The subject of this thesis focuses on polarization diversity coherent transmitters integrating III-V materials and silicon modulators for coherent transmission applications at 400 Gb/s and beyond. The signal emitted by a TE (Transverse Electricity) mode tunable laser is separated into two arms, each one is modulated by a phase modulator based on integrated Mach-Zehnder (MZ) interferometers, generating four 90°-phase-shifted symbols (IQ). The modulated signal is amplified by a Semiconductor Optical Amplifier (SOA). A polarization rotator is integrated at the output of one of the two MZs, in order to convert the TE mode into TM (Transverse Magnetic) mode. A polarization combiner is then used to obtain the polarization multiplexed signal (TE + TM) in the same fiber. This scheme allows the transmission rate to be multiplied by at least 4. The research work of this thesis is articulated along three axes: 1) Realization of widely tunable lasers for the IQ transmitter; 2) Design and realization of innovative phase modulators; 3) Design and realization of coherent transmitters complete with transmitter and receiver integrated on the same chip
Dupuy, Jean-Yves. "Théorie et Pratique de l'Amplificateur Distribué : Application aux Télécommunications Optiques à 100 Gbit/s". Thesis, Cergy-Pontoise, 2015. http://www.theses.fr/2015CERG0759/document.
Texto completoThe theory, design, optimisation and characterisation of distributed amplifiers in 0.7-µm InP DHBT technology, for 100-Gbit/s optical communication systems, are presented. We show how the appropriate implementation of the distributed amplifier concept in a bipolar transistors technology with high swing-speed product has enabled the realisation of an electro-optic modulator driver with 6.2- and 5.9-Vpp differential driving amplitude at 100 and 112 Gb/s, respectively, with a high signal quality. This circuit thus establishes the swing-speed product record at 660 Gb/s.V on wafer and at 575 Gb/s.V in a microwave module. In the frame of the European project POLYSYS, it has been co-packaged with a tunable laser and a modulator to realise a compact optoelectronic transmitter module, which has demonstrated performances advancing the state of the art of short reach 100-Gb/s optical communications
Malz, Stefan [Verfasser]. "Silicon Integrated Radio Front-End Design for 100 Gbit/s and Beyond / Stefan Malz". Wuppertal : Universitätsbibliothek Wuppertal, 2020. http://d-nb.info/1214389716/34.
Texto completoMüllrich, Jens. "Entwurf von Transimpedanzverstärkern für eine Datenrate von 40 Gbit/s unter besonderer Berücksichtigung von Kopplungseffekten". [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=969668295.
Texto completoMilivojevic, Biljana. "Study of optical differential phase shift keying transmission techniques at 40 Gbit/s and beyond". kostenfrei, 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=977176231.
Texto completoFILHO, ROGERIO DO NASCIMENTO REBELLO. "OPTICAL DATA TRANSMISSION AT 50 GBIT/S AND SPECTRAL EFFICIENCY OF 1 BIT/S/HZ". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2013. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35340@1.
Texto completoCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Neste trabalho realizamos uma prova da viabilidade de um sistema de comunicação óptica com capacidade de transmissão de 50 Gbit/s em uma largura de banda de 50 GHz utilizando o legado dos sistemas com taxas de 10 Gbit/s. Uma série de configurações experimentais foi testada em uma ordem de complexidade crescente para verificar separadamente as etapas e as técnicas aplicadas para o aumento da capacidade de transmissão de dados e a eficiência espectral. Em alguns casos, a curva característica resultante da configuração backto- back do analisador de taxa de erro de bit média foi utilizada como referência para comparação das configurações experimentais realizadas durante o trabalho.
In this work we perform a proof of feasibility of 50 Gbit/s transmission within a 50 GHz optical bandwidth exploring the 10 Gbit/s legacy. A series of experimental configurations were tested in an order of increasing complexity to verify separately the steps and applied techniques for increasing data transmission capacity and spectral efficiency. In some cases, the comparison of experimental configuration was made using the back-to-back configuration of the Bit Error Rate Tester.
Saad, Ricardo Enrique. "Projeto e otimização de pre-amplificadores de transimpedancia para recepção optica em 1 Gbit/s". [s.n.], 1989. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259847.
Texto completoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica
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Resumo: Este trabalho apresenta o projeto e detalhes da implementação de pré-amplificadores de transimpedância utilizáveis na recepção de sinais ópticos que transportam informação a uma taxa de até 1 Gbit/s. Os pré-amplificadores possuem dois estágios de amplificação utilizando transistores MESFET de arseneto de gálio alimentados por um fotodiodo PIN. Foram projetados três pré-amplificadores. No primeiro utilizou-se acoplamento a.c. entre os dois estágios de amplificação e, no segundo, o acoplamento foi d.c. levando-se em consideração a faixa dinâmica de operação dos circuitos, apresentando-se um método de projeto adequado para esta aplicação. No estudo a.c. dos circuitos fez-se uso dos parâmetros Y, obtendo-se expressões que permitem a análise completa dos circuitos. No estudo da estabilidade dos circuitos utilizou-se o parâmetro K, conjuntamente com os circuitos de estabilidade na Carta de Smith. Verificou-se, em particular, a grande influência da capacitância parasita do resistor de realimentação na estabilidade de cada um dos estágios de amplificação. Foi calculada a sensitividade destes receptores utilizando estudos recentes que incluem o ruído 1/f dos transistores. Para 1 Gbit/s foi calculada uma sensitividade de ¿ 31,3 dBm. O terceiro pré-amplificador foi projetado utilizando uma forma de polarização do primeiro estágio amplificador que permite melhorar, simultaneamente, a faixa dinâmica e a sensitividade.Os três circuitos acima foram construídos e testados obtendo-se resultados experimentais muito próximos dos esperados teoricamente. Um método não-convencional foi utilizado para a determinação do ganho de transimpedância, fazendo uso de técnicas de microondas
Abstract: This work shows the design and implementation of transimpedance pre-amplifiers for optical receivers working up to 1 Gbit/s. They are GaAs MESFET two-stage amplifiers fed by a PIN photodiode. Three pre-amplifiers were designed. In the first circuit an a.c. coupling between amplifying stages was used while, in the second, a d.c. coupling was used. For both circuits a d.c. study was carried out taking into account the operating dynamic range. The a.c. analysis used Y parameters and some expressions are shown that allows the determination of the behavior of the circuits The K parameter and the stability circles in the Smith Chart were used in the stability analysis. In particular, the large influence of the stray capacitance of the feedback resistor in the overall circuit stability was investigated The receiver sensitivity computed included the effect of the 1/f transistor noise. A value of -31.3 dBm for the sensitivity was obtained for 1 Gbit/s transmission. The third pre-amplifier was designed uSlng a d c bias arrangement that allows a simultaneous upgrading range and sensitivity of the circuit. of the dynamic. All three circuits were implementeded and tested. The experimental values obtained were expected in close agreement with the expected theoretical prediction. A non-conventional method was used to find the transimpedance gain, using microwave techniques
Mestrado
Mestre em Engenharia Elétrica
Xu, Tianhua. "Digital Dispersion Equalization and Carrier Phase Estimation in 112-Gbit/s Coherent Optical Fiber Transmission System". Licentiate thesis, KTH, Optik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-34034.
Texto completoQC 20110629
Ferenci, Damir [Verfasser] y Manfred [Akademischer Betreuer] Berroth. "Electronic components for optical data communication up to 50 Gbit/s / Damir Ferenci. Betreuer: Manfred Berroth". Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2013. http://d-nb.info/1042659532/34.
Texto completoCampos, Márcio Inomata. "Polihidroxialcanoatos (PHAs) obtidos a partir da glicerina bruta residual do biodiesel (GBRB): produção, otimização, cinética e propriedade". Universidade Federal da Bahia. Escola Politécnica, 2013. http://repositorio.ufba.br/ri/handle/ri/19126.
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A diversidade de utilização de materiais poliméricos acarreta preocupação devido a utilização de fonte não renovável para a sua produção, bem como à problemas ambientais causados pelo acúmulo do volume de lixo sólido gerado. Procurando minimizar este problema buscaram-se alternativas de produtos semelhantes aos plásticos de origem petroquímica, uma delas são os polímeros biodegradáveis. Os polihidroxialcanoatos (PHAs) são poliésteres sintetizados por microrganismos como substâncias naturais de reserva de carbono e energia, sendo acumulados pela célula microbiana na forma de grânulos intracelulares, podendo representar até 80% da massa seca celular. O presente trabalho teve como objetivo produzir polihidroxialcanoatos (PHAs) a partir da fermentação da glicerina bruta residual do biodiesel (GBRB), utilizando Cupriavidus necator, assim como, realizar a otimização, determinar os parâmetros cinéticos do processo e propriedades dos biopolímeros. Inicialmente, foram realizados alguns testes de produção de PHAs em agitador orbital com diferentes substratos e concentrações das mesmas, diferentes microrganismos, diferentes tempos e temperaturas de fermentação, além de testar métodos para extração do biopolímero nas células do microrganismo. Posteriormente, foi realizado um planejamento experimental DCCR 22 visando determinar a melhor concentração de GBRB e de nitrogênio limitante que produzisse maior quantidade de PHAs. Conhecendo-se as melhores condições para produção de PHAs, realizou-se a mudança no sistema de fermentação, para um biorreator de bancada (4,5L), com o intuito de maximizar a produção de PHAs. Um novo planejamento experimental foi realizado, visando determinar a melhor taxa de aeração e a melhor velocidade de agitação do sistema que proporcionasse a máxima produção de biopolímero. Realizou-se a caracterização dos biopolímeros em termos de FTIR, DSC, TG, DRX, MM e composição monomérica. A Glicerina bruta residual do biodiesel (GBRB) é um substrato rico em nutrientes e pode ser utilizada pelo microrganismo Cupriavidus necator em diversas concentrações para a produção de PHAs. O melhor tempo e temperatura para produção de PHAs a partir da fermentação da GBRB por Cupriavidus necator IPT 026 foram a 35ºC em 72h, respectivamente, na etapa de limitação de nitrogênio. A máxima produção de PHAs e biomassa (2,81 g.L-1 e 4,34 g.L-1, respectivamente) em agitador em agitador orbital (35oC, 72h e 180 rpm), ocorreu com 15 g.L- 1 de GBRB e 10 g.L-1 de nitrogênio. Em biorreator, foi possível aumentar a produção de PHAs em 77%. A máxima produção de PHAs (4,98 g.L-1) ocorreu a 15 g.L-1 de GBRB e 10 g.L-1 de nitrogênio, 1 vvm de taxa de aeração e 500 rpm de velocidade de agitação. A taxa de aeração e a velocidade de agitação foram otimizadas para maximizar a produção de PHAs (1,0373 vvm de taxa de aeração e 502,0396 de velocidade de agitação). O PHA obtido em biorreator por condições otimizadas foi o que apresentou as melhores propriedades. Em relação aos PHAs produzidos em agitador orbital, a Tm elevou em 6%, o grau de cristalinidade reduziu em 10%, a temperatura de degradação aumentou em 8% e a massa molar tambem se elevou, chegando a 18%. Todos os PHAs apresentaram espectros similares de FTIR de acordo com a literatura. A produção de PHAs a partir da GBRB é uma alternativa de agregação de valor ao resíduo, diminuindo os custos de produção do biopolímero
Schlagenhauf, Florian. "Körperbeschwerden in einer psychosomatischen Ambulanz eine Untersuchung mit dem Giessener Beschwerdebogen (GBB-24) /". [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=970363788.
Texto completoVeigel, Thomas [Verfasser] y Manfred [Akademischer Betreuer] Berroth. "Digitaler elektronischer Entzerrer für die optische Datenübertragung mit bis zu 43 Gbit/s / Thomas Veigel. Betreuer: Manfred Berroth". Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2012. http://d-nb.info/1024080005/34.
Texto completoBoyd, Andrew John. "Introducing the goal-based information network (GbIF) : documentation and evaluation of information flow in the low maturity organisation". Thesis, City University London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419000.
Texto completoGrillot, Frédéric. "Lasers monomodes à faible sensibilité à la rétroaction optique pour les transmissions à 2,5 GBit/s sans isolateur". Besançon, 2003. https://tel.archives-ouvertes.fr/tel-00007829.
Texto completoThe goal of this PhD work is to design monomode lasers having a low sensitivity to optical feedback for 2. 5GBit/s isolator-free transmissions. The study of conventional DFB (Distributed Feedback Lasers) lasers has allowed to understand both quantitatively and qualitatively the effects induced by optical feedback on the lasers and to relate these effects to the degradations in the bit error rate plots. Although a chip selection was found necessary, successful 2. 5GBit/s 85ʿC transmissions without floor and with low penalties have been achieved. In order to avoid any selection operation, new DFB laser structures based on a chirped bragg grating have been designed. With these lasers, state of the art and homegeneous static and dynamic performances from laser to laser were demonstrated. These results are very promising for high performance laser operating without the need for any optics or optical isolator, and open the way for all-optical telecommunication networks
Jaouën, Yves y Georges Alquié. "Modélisation, optimisation et réalisation d'un système optique cohérent 1 Gbits/s à modulation de fréquence à phase continue". Paris 6, 1993. http://www.theses.fr/1993PA066387.
Texto completoJaouen, Yves. "Modélisation, optimisation et réalisation d'un système optique cohérent 1 Gbit/s à modulation de fréquence à phase continue /". Paris : Ecole nationale supérieure des Télécommunications, 1994. http://catalogue.bnf.fr/ark:/12148/cb357076029.
Texto completoSantini, Guillaume. "Conception fabrication et caractérisation d’un photorécepteur cohérent en filière PIC InP pour les applications 100-400 Gbit/s". Thesis, Evry, Institut national des télécommunications, 2017. http://www.theses.fr/2017TELE0024/document.
Texto completoThis work focuses on the design, manufacturing and characterization of a coherent photoreceptor in PiC InP for 100-400 Gbit/s applications. The chosen solution is a preamplified coherent receiver with an SOA to improve the responsivity compared to a conventional coherent receiver. In addition, this receiver is made in buried technology to allow operation over a wider range of wavelengths. Finally, a coherent receiver without SOA is also produced to be able to evaluate its impact on the performances of our receiver. The first part of this study is devoted to reminders about very high speed optical transmissions, about state of the art on coherent receivers, about a presentation of the different photodetectors and a presentation of the 90° hybrid which is the core component in coherent receivers. Secondly, we present the various choices made for the design of our receiver. The study of two 90° hybrids simulated in ridge or in buried technology is detailed. We also comment the choices of photodiodes and SOA used for our component. The third chapter is devoted to the different technological steps used to build our preamplified receiver. We start with a description of the different epitaxial techniques used. Then, we present in detail the 22 technological steps required to realize our receiver. Finally, we group all the characterizations preformed on our coherent receiver. We characterize the unitary components of our receiver (hybrid 90°, UTC photodiodes and SOA). Finally we present the static and dynamic characteristics of our receiver and we compare its performances with the state of the art. This thesis demonstrates the feasibility of a preamplified receiver using a SOA in buried InP technology with a record of reponsivity of 5 A/W. This represents a gain of 12.5 dB compared to an ideal coherent receiver and a gain of 15,5 dB compared to the state of the art. In addition, the consumption generated by this integration remains very low (240 mW). Finally, we have demonstrated a 32 Gbauds demodulation with a Q factor of 14dB and the 40 GHz bandwidth of our photodiodes is compatible with 56 Gbauds applications. It can be improved for 100 Gbauds applications by reducing the size of our photodiodes. This thesis opens the way for a new preamplified coherent receiver for 400 Gbit/s applications
Dubray, Olivier. "Design and characterization of transmitter circuits architectures using silicon ring resonator modulators for high bit rate communications". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEC009/document.
Texto completoOver the past decade, with the diversification of connected devices (PCs, Tablets, TVs and Smartphones), the Internet ecosystem has drastically extended. Today, 80 % world traffic is concentrated in the data centers where the data rate, the size and the cost is still growing. To address such scaling issues as bandwidth density, energy consumption and cost of the interconnects inside the data centers, the development of new optical transmitters is critical. The aim of this thesis is to propose and evaluate transmitter architectures using silicon photonics technology to address next 400 Gbit/s data rate standard over up to 2 kilometer links. The selected electro-optical modulator is the silicon ring resonator modulator which has substantial benefits: low footprint, low energy consumption and enables dense multiplexing. The optical transmitter architectures evaluations were successively optimized: from the active junction to the complete optical transmitter. This study identified the performances trade-offs impacted by the ring resonator modulator parameters. A compact model was generated to physically optimize the component in a reduced simulation time. Then, using the compact model, two transmitter architectures were studied based on classical architecture. Both are based on eight ring resonator modulators arranged in series modulating eight different wavelengths. The difference is the modulation format: the first one is electrically modulated at 50 Gbaud in 2-levels pulse amplitude modulation (PAM-2) and the second one at 25 Gbaud 4-levels pulse amplitude modulation (PAM-4). The two solutions fit the 400 Gbit/s performances demand with the use of the same trade-offs. Finally, new transmitter architectures were proposed to generate PAM-4 modulation. Unlike the previous architecture, they have in input two parallel bit streams which are optically combined to generate the PAM-4 modulation. The first solution is based on two silicon ring resonator modulator arranged in series. This architecture was validated through 30 Gbit/s transmission characterizations with only 1 Vpp. A second solution was then proposed, based on two silicon ring resonator modulators arranged in parallel in a Mach Zehnder interferometer. In the same way, transmission characterizations at 30 Gbit/s with 1.2 Vpp allows this architecture to be validated
Frignac, Yann. "Contribution à l'ingénierie des systèmes de transmission terrestres sur fibre optique utilisant le multiplexage en longueur d'onde de canaux modulés au débit de 40 Gbit/s". Phd thesis, Télécom ParisTech, 2003. http://pastel.archives-ouvertes.fr/pastel-00000688.
Texto completoHur, Young Sik. "Equalization and Near-End Crosstalk (NEXT) Noise Cancellation for 20-Gbit/sec 4-PAM Backplane Serial I/O Interconnections". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7522.
Texto completoBien, Franklin Young-Jae. "Reconfigurable equalization for 10-Gb/sec serial data links in a 0.18-μm CMOS technology". Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14026.
Texto completoYamamuka, Mikio. "A study on reaction mechanisms in chemical vapor deposition of (Ba,Sr)TiO3 films for Gbit-scale DRAM capacitors". 京都大学 (Kyoto University), 2002. http://hdl.handle.net/2433/149806.
Texto completoMeliani, Chafik. "Circuits intégrés amplificateurs à base de transistors HEMT pour les transmissions numériques à très haut débit (≥40 Gbit/s)". Paris 7, 2003. http://www.theses.fr/2003PA077172.
Texto completoCohen-Jonathan, Cécile. "Photodiodes à avalanche à multi puits quantiques AllnAs/AlGaInAs, à éclairage latéral pour les télécommunications à 20 Gbit/s". Grenoble 1, 1998. http://www.theses.fr/1998GRE10089.
Texto completoBaumheinrich, Thorsten. "Integrierte Schaltungen in SiGe-Bipolartechnologie für die Übertragung von binären und quaternären Signalen bis 40 Gbit-s Entwurf und Charakterisierung /". [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=96061396X.
Texto completoMELIANI, Chafik. "Circuits intégrés amplificateurs à base de transistors HEMT pour les transmissions numériques à très haut débit (>=40 Gbit/s)". Phd thesis, Université Paris-Diderot - Paris VII, 2003. http://tel.archives-ouvertes.fr/tel-00007587.
Texto completoNgô, Minh Nguyêt. "Theoretical and experimental studies of semiconductor based photonic devices for all-optical signal processing at 40 Gbit/s and beyond". Rennes 1, 2010. http://www.theses.fr/2010REN1E004.
Texto completoSzilàgyi, Làszlò, Guido Belfiore, Ronny Henker y Frank Ellinger. "20–25 Gbit/s low-power inductor-less single-chip optical receiver and transmitter frontend in 28 nm digital CMOS". Cambridge University Press, 2017. https://tud.qucosa.de/id/qucosa%3A70657.
Texto completoCuenot, Benjamin. "Contribution to engineering of WDM Nx160 Gbit/s optical transmission systems : Analysis of optical signal degradation induced by propagation impairments". Université Louis Pasteur (Strasbourg) (1971-2008), 2004. https://publication-theses.unistra.fr/public/theses_doctorat/2004/CUENOT_Benjamin_2004.pdf.
Texto completoLefrançois, Mathieu. "ÉTUDE DE TECHNOLOGIES AVANCÉES POUR L'OPTIMISATION DES SYSTÈMES DE TRANSMISSION OPTIQUE MULTIPLEXÉS EN LONGUEUR D'ONDE AU DÉBIT DE 40 GBIT/S". Phd thesis, Université Paris Sud - Paris XI, 2007. http://tel.archives-ouvertes.fr/tel-00202576.
Texto completoLefrançois, Mathieu. "Etude de technologies avancées pour l'optimisation des systèmes de transmission optique multiplexés en longueur d'onde au débit de 40 Gbit/s". Paris 11, 2007. http://www.theses.fr/2007PA112196.
Texto completoWavelength-Division-Multiplexed fiber-optic transmission systems working at 40 Gbit/s channel bit rate will soon be essential to follow the expected increasing of capacity demand, that could no more be ensured by existing 10 Gbit/s systems. The study of advanced technologies that could allow the optimization of their performance is then essential. To ensure it, we first have studied modulation formats to be used with high capacity while ensuring optimal transmission. The phase-shaped binary transmission and the differential quaternary phase-shift keying meet these criterions. Furthermore we have studied the predominating nonlinear effects occurring at 40 Gbit/s, the so-called intrachannel nonlinear effects. The phase modulation also allows an high tolerance to these effects, which is enhanced by the use of a polarization alternation. We then have studied advanced systems especially developed for 40 Gbit/s channel bit rate. Through these systems studies, we first have shown that conventional submarine systems, originally developed for 10 Gbit/s bit rate, can be used at 40 Gbit/s bit rate with phase-modulated formats and dispersion-slope compensation. Then we have studied systems comprising an information coding device at the transmitter to allow the impact of intrachannel nonlinear effects to be lower with minimal changes in the original information sequence. Finally, we have shown that improved new-generation submarine systems, without in-line compensating fibers, but which comprise an optical phase-conjugation device, can potentially overlook existing submarine systems
Siemann, Maria Eugênia. "Análise por imagem do sistema nervoso central e do fenótipo de indivíduos brasileiros com síndrome de Optiz G/BBB". Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/61/61132/tde-12012015-163211/.
Texto completoThe present survey focused on the evaluation of the central nervous system images findings in patients with the Opitz G/BBB syndrome obtained through magnetic nuclear resonance imaging (MRI). The Opitz G/BBB syndrome (OMIM; 145410; 300000) is a midline congenital malformation syndrome, clinical and genetically heterogeneous with an X-linked form mapped on Xp22.3 and a not well defined autosomal dominant form purportedly on 22q11, however they are recognized as one entity. This multiple congenital midline malformation syndrome is mainly characterized by hypertelorism, widows peak, broad nasal bridge, hypospadias, cleft lip/palate, and laryngo-tracheo-esophageal abnormalities. In the present study we have evaluated nineteen male patients of Brazilian extraction, with no preferential ethnic background, with age span ranging from 5 to 38 years old and previously diagnosed with the OS were selected from the files of the Section of Clinical Genetics, Division of Syndromology, HRAC-USP Bauru. From these patients, six had previous evaluation through molecular analysis graciously performed by Chiara Migliore (Institute for Maternal and Child Health - IRCCS \"Burlo Garofolo\", Trieste, Italy) and Germana Meroni (CBM - Cluster in Biomedicine, AREA Science Park, Trieste, Italy). Imaging studies through MRI were performed in all patients. Special attention was given to 3 out the 19 patients who showed unique phenotypes within the OS spectrum: 2 of them presented ptosis, pterigium colli, and abnormal scapular girdle as deviant signs and they presented mild/moderate cerebellar anomalies, and the 3rd presented severe mental retardation and microcephaly associated to generalized severe imaging findings mainly represented by generalized cortical atrophy and huge Dandy-Walker anomaly. Main MRI findings of the whole sample included wide cisterna magna (15 = 78,95%), enlarged 4th ventricle (14 = 73,68%), cerebellar vermis hypoplasia (8 = 42,10%); abnormal cerebellar hemispheres and cavum septum vergae (3 = 15,79% each one); cerebral cortical atrophy, enlarged III ventricle, enlarged prepontine cisterna, calosal hypoplasia and cavum septum pellucidum counts, each one, two patients (10,53%). Apparently there is no correlation between the clinical phenotype and the imaging findings, and there is a wide variability from patients to patients, ranging from mild midline anomalies to severe Dandy Walker anomaly. Behavioral and severe cognitive deficits usually reported in the pertinent literature as main findings associated to cerebellar vermis hypoplasia and/or cerebellar hypoplasia were not recognized as a remarkable finding in the present series. The high frequency of cerebellar anomalies in the OS patients led us to recommend a reformulation in the genetic counseling approach to these patients.
Zach, Ondřej. "Nástroje pro měření kvality videosekvencí bez reference". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-219973.
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