Multiplexers
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Artificial Immune Network Design of Optical Multiplexers/Demultiplexers
Abstract An efficient design approach of directional couplers based multiplexers/demultiplexers for optical communication applications, by using an adapted artificial immune network algorithm for optimization (opt-AiNet), is presented and validated by using the beam propagation method. Two key multiplexers/demultiplexers based on planar waveguides and optica
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2015-12
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2. Transmission of a 20 Gb/s NRZ OOK signal throughout a 390 km fiber link and a cascade of 11 x 50 GHz filters and 9 x EDFAs
This paper presents a qualitative analysis of the impact caused by fiber propagation effects and by a cascade of optical filters, designed for 10 Gb/s NRZ OOK transmission, and optical amplifiers on a 20 Gb/s NRZ OOK optical signal traveling a 390 km fiber link. The choice for such bit rate and modulation format has been driven by the 50 GHz bandwidth of the
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2011-06
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3. Funções de multiplexação E1 / E1 multiplexing functions
Este trabalho tem como objetivo a especificação de um conjunto de módulos de circuito, capazes de executar as funções de multiplexação relativas Hierarquia Digital E1, do ITU-T. A fim de alcançar o objetivo proposto, são realizadas consultas as normas nacionais (Praticas Telebrás) e internacionais (ITU-T) e estudos bibliográficos acerca do projeto
Publicado em: 2010
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4. ProduÃÃo e eficiÃncia de uso da Ãgua da bananeira cv. Pacovan Ken sob diferentes tensÃes de Ãgua no solo / Production and efficiency of water use in banana cv. Pacovan ken under different soil water tensions
The objective of the study was to determine the effect of different soil water tensions on banana grawth, production and water use effecienty. The experiment was carried out from November 2005 to April 2007, in a Cambisol, located in the Irrigation District of Jaguaribe-Apodi, Limoeiro do Norte - CE (latitude 05Â 08 S longitude 37Â59 W, altitude 160 m). It
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/09/2008
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5. Evaluation of models for estimating electrical conductivity and potassium concentration of the soil solution by using time domain reflectometry (TDR) / Avaliação de modelos para estimar a condutividade elétrica e a concentração de potássio na solução do solo usando Reflectometria no Domínio do Tempo (TDR)
Time domain reflectometry is a technique that has been outstanding in the last years as an attractive tool for soil water content (θ) and for bulk electrical conductivity (ECa) monitoring on real time, automatically, with the minimum soil disturbance. Besides, this technique allows the knowledge of electrical conductivity (ECw) and nutrient concentratio
Publicado em: 2006
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6. PROJETO DE TOPOLOGIAS VIRTUAIS PARA REDES ÓPTICAS MULTISERVIÇO
Optical communication systems have emerged as the best solution for large scale data transport network implementation, providing optical channels with very high bit rates and covering large distances with low error probability. The entire bandwidth of the optical fibers became available with the development of the wavelength division multiplexing (WDM) techn
Publicado em: 2005
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7. A timed Petri net methodology based on area estimator for hardware/software co-design systems environments / Uma metodologia para estimativa de Ãrea baseada em redes de Petri temporizadas para ambientes de sistemas de hardware/software co-design
Most modern electronic systems consist of dedicated hardware and programmable components (called software components). Over the last few years, the number of methodologies that concurrently apply design techniques from different areas to develop mixed hardware/software system has been growing considerably. The concurrent design of mixed hardware/software sys
Publicado em: 2004
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8. AVALIAÇÃO DE PARÂMETROS DE QOS NA TRANSMISSÃO DE VOZ SOBRE IP / ASSESSMENT OF QOS PARAMETERS IN VOICE OVER IP TRANSMISSION
This work presents a study aiming at to establish a methodology for sizing a VoIP system, focusing, in particular, the sizing of a statistical multiplexer. We apply existing models and results for the general problem of the statistical multiplexer to the specific case of a VoIP system, taking in account the characteristics of the traffic, the requirements of
Publicado em: 2004
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9. Sistematização crítica das tendências de padronização de arquiteturas e protocolos em redes ópticas / Critic sistematization of standardization tendencies of the architectures and protocols in optical networks
The main objective of this work is to analyze the evolution trends for the architecture of the optical networks, discuss the state of the art protocols required for its development and evaluate the various efforts being carried out by different institutions in order to achieve standardization. In this context, optical networks are those in which the dominant
Publicado em: 2003
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10. SMART WAVELENGTH ROUTING ASSIGNMENT ON WDM NETWORKS BY FUNCTIONALITY ON PHYSICAL LAYER / ROTEAMENTO INTELIGENTE EM REDES WDM POR FUNCIONALIDADE NA CAMADA FÍSICA / RUTEAMIENTO INTELIGENTE EN REDES WDM POR FUNCIONALIDAD EN LA CAPA FÍSICA
In conventional optical networks, optoelectronic conversions are needed in each node for the sake of a proper packet routing. Simultaneously, intensive managing resources should be allocated to accomplish the routing task. The correct introduction of intelligence and functionality within the network physical layer may lead to some advantages over conventiona
Publicado em: 2001
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11. Implementação de modelos de amplificadores a fibra dopada em érbio para simulação de enlaces opticos
In this work two models were developed for the optical amplifier: the first is based on its gain curve and in the resolution of the model through the maximum value of gain; the second is based on the interactive resolution of the rate equations that describe the device, being used the values of the emission and absorption cross sections and the method of Run
Publicado em: 1990