Fiber Optics
Mostrando 13-24 de 39 artigos, teses e dissertações.
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13. Análise experimental da aplicação da tecnologia de rádio sobre fibra em redes IEEE 802.15.4 / Analysis of applying the technology of radio-overfiber networks in IEEE 802.15.4.
This work presents an experimental investigation on the implementation of wireless sensor networks (IEEE 802.15.4) over fiber optics. Such investigation was performed with the utilization of IEEE 802.15.4 transceivers, an optical fiber infrastructure inside a field-trial network, called KyaTera Network, and directly modulated lasers and photodiodes designed
Publicado em: 2009
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14. New technique for the implementation of digital demodulation of fiber optic gyroscopes / Implementação de uma nova tecnica para demodulação digital de sinal de giroscopio a fibra optica
Gyroscopes are devices used to measure angular orientation, being extensively employed for guidance, navigation and stabilization. Among the many types of gyroscopes, IFOG (Interferometer Fiber Optic Gyroscope), based on Sagnac effect, is the most interesting solution due to its high sensitivity, resolution, reliability, small size and EMI immunity. The pres
Publicado em: 2009
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15. Análise mercadológica para a implementação da tecnologia FTTH: uma aplicação do método SWOT / Marketing analysis for FTTH technology implementation: an application of SWOT method
The fiber optics is a transmission system that has been used to enable products that need high bandwidth, such as the telephone system, videoconferencing, local area networks (LANs), downloads of large files etc. In Brazil, we found an increased number of fiber optic networks. This ratify its advantages in relation to metal wire cable (immunity to electromag
Publicado em: 2009
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16. O metodo de geração de colunas aplicado a problemas de otimização em grafos / Column generation technique applied to graph optimization problems
In this thesis, two combinatorial optimization problems are modeled by integer linear programming and solved using the column generation technique. Both cases correspond to generalizations of classical problems in graphs that occur in many practical situations. The first, called capacitated ring-star problem is a generalization of the vehicle routing problem
Publicado em: 2009
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17. Optimum design applied to electrooptic modulators / Projeto ótimo de moduladores eletroópticos
Many design developments involve the optimization of several objective functions. These objective functions are often conflicting with each other and they cannot be simply aggregated into only one function to be optimized. This type of problem is known as the multiobjective optimization problem, for which the solution is a set of points known as Pareto optim
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/02/2008
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18. Development of a eletronic positioner for micrometric structures / Desenvolvimento de um posicionador eletronico para estruturas micrometricas
Este trabalho tem por objetivo apresentar o desenvolvimento de um posicionador eletrônico para estruturas micrométricas e controlado através da porta paralela de um computador. O equipamento desenvolvido é controlado por um software, onde o usuário pode posicionar objetos com passos tridimensionais e micrométricos. Os resultados obtidos foram satisfat�
Publicado em: 2008
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19. Projeto ótimo de moduladores eletroópticos / Optimum design applied to electrooptic modulators
Many design developments involve the optimization of several objective functions. These objective functions are often conflicting with each other and they cannot be simply aggregated into only one function to be optimized. This type of problem is known as the multiobjective optimization problem, for which the solution is a set of points known as Pareto optim
Publicado em: 2008
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20. SINGLE PHOTON COUNTING IN THE NEAR- AND MID-INFRARED VIA FREQUENCY UP-CONVERSION APPLIED TO QUANTUM COMMUNICATIONS / CONTAGEM DE FÓTONS NO INFRAVERMELHO PRÓXIMO E MÉDIO VIA CONVERSÃO DE FREQÜÊNCIAS APLICADA A COMUNICAÇÕES QUÂNTICAS
Two single photon counting devices, operating at near- and mid-infrared wavelengths, are introduced and experimentally investigated. Both use a twostage technique, comprised of an initial frequency up-conversion procedure inside a nonlinear crystal followed by a silicon avalanche photodiode. Whereas the first project consists on detection of single photons a
Publicado em: 2007
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21. Fluid insertion related processes for sensing using photonic crystal fibers / Processos relacionados a inserção de fluidos para sensoriamento com fibras de cristal fotonico
This work presents studies of how to insert fluids (liquid and gas) into microstructured optical fibers, especially photonic crystal fibers, also known as PCF?s. These optical fibers possess air holes that run along its entire length. They can be divided into two major groups: solid core fibers that guide light by total internal reflection and hollow core fi
Publicado em: 2007
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22. Amplificadores Ãpticos, estudos de polarizaÃÃo e geraÃÃo de pulso usando processos paramÃtricos em fibras Ãpticas
The recent telecommunication development can be, to a large extent, attributed to the capacity of transmitting information (video, sound and data) at high transmission rates (Tbits/s) through the optical fiber. The constant advances in the technological development of active and passive devices based on optical fibers have enabled a steady increase in commun
Publicado em: 2007
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23. ANÁLISE DA CALIBRAÇÃO DE SENSORES A REDE DE BRAGG EM FIBRAS ÓPTICAS INTERROGADOS ATRAVÉS DA TÉCNICA DE FILTROS FIXOS / ANALYSIS OF THE CALIBRATION TO BRAGG GRATING SENSORS IN FIBER OPTICS INTERROGATED TROUGHT FIXED FILTERS TECHNIQUE
Nesse trabalho, descreve-se o desenvolvimento de uma calibração do sistema de interrogação dos espectros das redes de Bragg baseando-se em uma simulação numérica adotada de testes experimentais. O objetivo é calibrar a técnica de demodulação óptica utilizando dois filtros de transmissão fixos, procurando-se principalmente a posição verdadeira
Publicado em: 2007
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24. Quantum entanglement between atoms located in distinct cavities / Emaranhamento quantico entre atomos localizados em cavidades distintas
In this work, we study the dynamics of the entanglement between two remote atoms in distinct cavities. The main focus is the production of maximal entangled states between identical atoms of two levels in distinct cavities and, in particular, coupled cavities. Initially we present the main concepts of the Theory of Quantum Information, qualitative and quanti
Publicado em: 2007