Dr. João Crisóstomo Weyl Albuquerque Costa Profile

Dr. João Crisóstomo Weyl Albuquerque Costa

at Univ Federal do Para

SPIE Involvement:

Author

Publications (30)

Proceedings Article | 28 September 2015 Paper

In-fiber Michelson interferometer inclinometer

C. da Silveira, P. Jorge, J. Costa, M. Giraldi, J. Santos, O. Frazão

Proceedings Volume 9634, 96341W (2015) https://doi.org/10.1117/12.2195392

KEYWORDS: Visibility, Michelson interferometers, Sensors, Fringe analysis, Cladding, Refractive index, Interferometers, Head, Capillaries, Temperature metrology

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Proceedings Article | 22 August 2014 Paper

Guidance features at terahertz spectrum of microstructured fibers filled with silver rods

Markos Cardoso, Anderson Silva, João C. W. A. Costa

Proceedings Volume 9286, 92863R (2014) https://doi.org/10.1117/12.2063548

KEYWORDS: Terahertz radiation, Dispersion, Silver, Waveguides, Optical fibers, Plasmonics, Electromagnetism, Dielectrics, Polymers, Absorption

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Proceedings Article | 22 August 2014 Paper

Remote curvature fiber sensors using core mismatch structures and OTDR based interrogation

Cindy Fernandes, Maria Thereza Rocco Giraldi, Carlos Gouveia, Marco de Sousa, João C. W. A. Costa, Orlando Frazão, Pedro Jorge

Proceedings Volume 9286, 928646 (2014) https://doi.org/10.1117/12.2063008

KEYWORDS: Sensors, Signal attenuation, Remote sensing, Fiber optics sensors, Single mode fibers, Structured optical fibers, Code division multiplexing, Temperature metrology, Multimode fibers, Optical sensors

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Proceedings Article | 2 June 2014 Paper

Fabrication and characterization of spun HiBi PCF fibers for current sensing applications

I. Nascimento, G. Chesini, A. C. Brígida, J. Hayashi, J. Baptista, J. C. W. Costa, M. A. Martinez, P. A. Jorge, Cristiano M. Cordeiro

Proceedings Volume 9157, 915723 (2014) https://doi.org/10.1117/12.2059197

KEYWORDS: Optical fibers, Birefringence, Sensors, Polarization, Fiber optics sensors, Photonic crystal fibers, Fiber optics, Optical fiber cables, Magnetism, Polarimetry

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Proceedings Article | 2 June 2014 Paper

Interrogation system for fiber loop mirror sensors using OTDR

Maria Thereza Rocco Giraldi, Cindy Fernandes, Marta Ferreira, João C. Costa, José Santos, Orlando Frazão

Proceedings Volume 9157, 915760 (2014) https://doi.org/10.1117/12.2059191

KEYWORDS: Sensors, Mirrors, Multiplexing, Signal attenuation, Fiber optics sensors, Remote sensing, Optical fibers, Fiber Bragg gratings, Single mode fibers, Reflectometry

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Proceedings Article | 18 November 2013 Paper

Enhancement of refractive index sensitivity of the in-line Mach-Zehnder interferometer through bending

Clenilson da Silveira, J. W. Costa, M. T. Giraldi, Marcos A. Franco, P. A. Jorge

Proceedings Volume 8785, 8785FM (2013) https://doi.org/10.1117/12.2028226

KEYWORDS: Refractive index, Sensors, Mach-Zehnder interferometers, Beam propagation method, Optical fibers, Numerical simulations, Interferometers, Signal attenuation, Interferometry, Fiber Bragg gratings

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Proceedings Article | 18 November 2013 Paper

Effective medium theory of subwavelength arrays of metallic nanowires: a numerical approach based on modal propagation method

A. Silva, I. Leite, J. Teixeira, J. Araujo, J. C. W. Costa, M. T. Giraldi, P. A. Jorge, A. Guerreiro

Proceedings Volume 8785, 87850A (2013) https://doi.org/10.1117/12.2026022

KEYWORDS: Radio propagation, Refractive index, Silver, Electromagnetism, Metamaterials, Homogenization, Interfaces, Computer simulations, Wave propagation, Nanowires

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Proceedings Article | 18 November 2013 Paper

Development of an electrical current sensor prototype for applications in high-power lines

I. Nascimento, A. C. Brígida, J. Baptista, J. C. W. Costa, M. A. Martinez, P. A. Jorge

Proceedings Volume 8785, 8785FP (2013) https://doi.org/10.1117/12.2031429

KEYWORDS: Sensors, Signal processing, Magnetic sensors, Magnetism, Data acquisition, Prisms, Prototyping, Birefringence, Glasses, Polarimetry

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Proceedings Article | 18 November 2013 Paper

Ag-nanowire metamaterials: spectral reflectance analysis and homogenization models

I. Leite, A. Silva, A. Hierro-Rodríguez, C. Sousa, M. Fernández-García, J. Teixeira, J. Araujo, M. Giraldi, J. W. C. Costa, D. Viegas, P. A. Jorge, A. Guerreiro

Proceedings Volume 8785, 8785FL (2013) https://doi.org/10.1117/12.2027626

KEYWORDS: Metamaterials, Homogenization, Reflection, Reflectivity, Optical properties, Silver, Data modeling, Absorption, Metals, Nanowires

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Proceedings Article | 20 May 2013 Paper

Fabrication of a spun elliptically birefringent photonic crystal fiber and its characterization as an electrical current sensor

A. Brígida, I. Nascimento, G. Chesini, J. Hayashi, J. Baptista, J. Costa, M. Martinez, P. Jorge, C. Cordeiro

Proceedings Volume 8794, 87940F (2013) https://doi.org/10.1117/12.2026865

KEYWORDS: Sensors, Birefringence, Photonic crystal fibers, Fiber optics sensors, Single mode fibers, Magnetism, Optical fibers, Polarimetry, Fiber optics, Signal processing

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Proceedings Article | 26 July 2011 Paper

Interferometric optical fiber inclinometer with dynamic FBG based interrogation

C. R. da Silveira, J. P. Carvalho, P. Jorge, J. W. A. Costa, M. T. R. Giraldi, J. L. Santos, E. L. Carvalho Júnior, D. O. Figueiredo, O. Frazão

Proceedings Volume 8001, 800145 (2011) https://doi.org/10.1117/12.892186

KEYWORDS: Fiber Bragg gratings, Sensors, Visibility, Michelson interferometers, Modulation, Interferometry, Optical fibers, Signal detection, Interferometers, Fusion splicing

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Proceedings Article | 9 September 2010 Paper

Dynamic interrogation of long period gratings with modulated fibre Bragg gratings

J. Carvalho, L. Coelho, L. Correia, O. Frazão, P. A. S. Jorge, J. Baptista, I. Dias, J. Santos, J. Weyl, M. Pontes, M. Martinez, A. Barbero, R. Ribeiro, A. J. G. Abelém, M. T. R. Giraldi

Proceedings Volume 7653, 76532C (2010) https://doi.org/10.1117/12.866444

KEYWORDS: Fiber Bragg gratings, Modulation, Refractive index, Erbium, Head, Optical amplifiers, Raman spectroscopy, Fiber amplifiers, Electronics, Sensors

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Proceedings Article | 1 May 2008 Paper

Performance of a free space optics subsystem boosted by SCM implementation

Diogo Vieira Nogueira Coelho, Thiago V. N. Coelho, Maria Thereza Miranda Rocco Giraldi, Maria José Pontes, Marcelo Eduardo Vieira Segatto, João Crisóstomo Weyl Albuquerque Costa

Proceedings Volume 6996, 69961I (2008) https://doi.org/10.1117/12.781584

KEYWORDS: Free space optics, Particle filters, Modulation, Multiplexing, Amplitude shift keying, Transmitters, Eye, Telecommunications, Receivers, Intermodulation

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Proceedings Article | 1 May 2008 Paper

Studies of different modulation techniques in the integration of SCM optical communication system

Diogo Vieira Nogueira Coelho, Maria Thereza Miranda Rocco Giraldi, Daniel J. C. Coura, Marcelo Eduardo Vieira Segatto, Maria José Pontes, João Crisóstomo Weyl Albuquerque Costa

Proceedings Volume 6996, 69961W (2008) https://doi.org/10.1117/12.781500

KEYWORDS: Modulation, Particle filters, Optical fibers, Eye, Multiplexing, Amplitude shift keying, Intermodulation, Transmitters, Dispersion, Receivers

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Proceedings Article | 2 October 2007 Paper

Performance evaluation of load forecasting models for energy purchase of power suppliers in the Amazonian region

Guilherme Conde, Ádamo Santana, Carlos Renato Lisboa Frances, Claudio Rocha, Liviane Rego, Diego Cardoso, João Costa, Vanja Gato

Proceedings Volume 6763, 67630V (2007) https://doi.org/10.1117/12.748397

KEYWORDS: Wavelets, Data modeling, Neural networks, Performance modeling, Decision support systems, Factor analysis, Error analysis, Hydroelectric energy, Artificial neural networks, Neurons

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Proceedings Article | 10 September 2007 Paper

Sequence and spread spectrum time domain reflectometry for transmission line analysis

Jacklyn Reis, Agostinho Castro, João Costa, Jaume Riu, Klas Ericson

Proceedings Volume 6776, 67760L (2007) https://doi.org/10.1117/12.735873

KEYWORDS: Reflectometry, Transceivers, Signal detection, Convolution, Modulation, Interference (communication), Computer simulations, Integrated circuits, Transmitters, Phase shift keying

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Proceedings Article | 10 September 2007 Paper

Triple play service under the impact of nonstationary noise in a DSL system: an Amazon approach

Lamartine de Souza, Diego Cardoso, Marcelino Silva, Marcos Seruffo, Carlos Francês, João Costa, Agostinho Castro, Gervásio Cavalcante, Jaume Rius i Riu

Proceedings Volume 6776, 67760K (2007) https://doi.org/10.1117/12.734756

KEYWORDS: Video, Internet, Telecommunications, Televisions, Molybdenum, Broadband telecommunications, Interference (communication), Humidity, Multimedia

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Proceedings Article | 10 September 2007 Paper

MDP-based resource allocation for triple-play transmission on xDSL systems

Lamartine de Souza, Glaucio de Carvalho, Diego Cardoso, Solon de Carvalho, Carlos Frances, João Costa, Jaume Rius i Riu

Proceedings Volume 6776, 67760F (2007) https://doi.org/10.1117/12.750205

KEYWORDS: Video, Internet, Networks, Multimedia, Broadband telecommunications, Data modeling, Copper, Televisions, Computer programming, Video processing

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Proceedings Article | 10 September 2007 Paper

Performance evaluation of IPTV traffic over pDSL

Diego Cardoso, Marcelino da Silva, Marcos Seruffo, Lamartine de Souza, Carlos Francês, Jorge de Souza, João Costa

Proceedings Volume 6776, 67760G (2007) https://doi.org/10.1117/12.751924

KEYWORDS: Photonic integrated circuits, Video, Networks, Telecommunications, Internet, Data communications, Real-time computing, Signal attenuation, Molybdenum, Televisions

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Proceedings Article | 13 June 2007 Paper

Impact of non-stationary noise on xDSL systems: an experimental analysis

Lamartine de Souza, Diego Cardoso, Marcelino Silva, Marcos Seruffo, Dário Russillo, João C. Costa, Carlos R. Francês, Agostinho L. Castro, Gervásio P. dos S. Cavalcante, Jaume Riu

Proceedings Volume 6603, 66030G (2007) https://doi.org/10.1117/12.724705

KEYWORDS: Electromagnetic coupling, Error analysis, Interference (communication), Systems modeling, Internet, Statistical analysis, Data modeling, Statistical modeling, Transceivers, Device simulation

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Proceedings Article | 12 October 2006 Paper

Strategies for improving the interpretability of Bayesian networks using Markovian time models and genetic algorithms

Ádamo de Santana, Cláudio Rocha, Carlos Francês, Solon Carvalho, Nandamudi Vijaykumar, João Costa

Proceedings Volume 6383, 63830R (2006) https://doi.org/10.1117/12.686413

KEYWORDS: Data modeling, Genetic algorithms, Data mining, Lithium, Optimization (mathematics), Decision support systems, Protactinium, Knowledge discovery, Visualization, Autoregressive models

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Proceedings Article | 12 October 2006 Paper

Decision support in power systems based on load forecasting models and influence analysis of climatic and socio-economic factors

Cláudio Rocha, Ádamo de Santana, Carlos Francês, Ubiratan Bezerra, Armando Tupiassú, Vanja Gato, Liviane Rego, João Costa

Proceedings Volume 6383, 63830I (2006) https://doi.org/10.1117/12.686433

KEYWORDS: Climatology, Data modeling, Decision support systems, Neural networks, Visualization, Systems modeling, Databases, Mathematical modeling, Hydroelectric energy, Filtering (signal processing)

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Proceedings Article | 2 October 2006 Paper

A methodology for measurements of basic parameters in a xDSL system

Edson Brito, Lamartine de Souza, Éder Patrício, Agostinho Castro, Gervásio P. dos S. Cavalcante, João Crisóstomo Costa, Klas Ericson, Fredrik Lindqvist, Jaume Rius I Riu

Proceedings Volume 6390, 63900M (2006) https://doi.org/10.1117/12.686685

KEYWORDS: Scattering, Copper, Signal attenuation, Network security, Data communications, Telecommunications, Device simulation, Resistance, Signal processing, Roentgenium

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Proceedings Article | 2 October 2006 Paper

A feasibility study of powerline communication technology for digital inclusion in Brazilian Amazon

Jorge de Souza, Marcelino da Silva, Carlos Francês, João Costa, Ádamo Santana, Marcelo Segatto, Flavio Antonio, Gabryella Rodrigues

Proceedings Volume 6390, 63900I (2006) https://doi.org/10.1117/12.686311

KEYWORDS: Photonic integrated circuits, Data communications, Prototyping, Molybdenum, Networks, Circuit switching, Telecommunications, Modulation, Signal attenuation

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Proceedings Article | 2 October 2006 Paper

Characterization of subscriber local loop by measures and analysis of frequency and impulse responses

João Costa, Jacklyn Reis, Igor Negrão, Agostinho Castro, Lamartine de Souza, Klas Ericson, Fredrik Lindqvist, Jaume Rius I Riu

Proceedings Volume 6390, 63900N (2006) https://doi.org/10.1117/12.686697

KEYWORDS: Computer simulations, Mathematical modeling, Reflectometry, Systems modeling, Signal attenuation, Differential equations, Signal processing, Fourier transforms, Transformers, Measurement devices

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Proceedings Article | 24 May 2006 Paper

Influence of fiber parameters on the performance of a SCM_QPSK transmission system

Arnaldo Togneri, Marcelo Segatto, Maria José Pontes, Maria Thereza Giraldi, J.C.W.A. Costa

Proceedings Volume 6193, 619316 (2006) https://doi.org/10.1117/12.662826

KEYWORDS: Modulation, Particle filters, Dispersion, Eye, Quadrature amplitude modulation, Modulators, Optical fibers, Receivers, Nonlinear optics, Phase shift keying

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Proceedings Article | 21 October 2004 Paper

Fiber Bragg optimization using parallel processing and genetic algorithm

M. de Sousa, L. de Souza, C. Sales, Joao Chamma Carvalho, Carlos Frances, Joao Costa

Proceedings Volume 5622, (2004) https://doi.org/10.1117/12.591963

KEYWORDS: Parallel processing, Genetic algorithms, Fiber Bragg gratings, Optimization (mathematics), Optical design, Reflectivity, Computing systems, Laser optics, Visibility, Matrices

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Proceedings Article | 13 October 2000 Paper

Design of optical devices based on multilayer structures using genetic algorithms

Joao Chamma Carvalho, Joao Costa

Proceedings Volume 4120, (2000) https://doi.org/10.1117/12.403610

KEYWORDS: Refractive index, Reflectivity, Optical components, Gallium, Genetic algorithms, Beam splitters, Antireflective coatings, Multilayers, Optical design, Genetics

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Proceedings Article | 16 June 2000 Open Access

Simulink toolbox for simulation and analysis of optical fiber links

Claudio de Melo, Cesar Lima, Licinius de Alcantara, Ronaldo dos Santos, Joao Costa

Proceedings Volume 3831, (2000) https://doi.org/10.1117/12.388731

KEYWORDS: Optical fibers, Light emitting diodes, Semiconductor lasers, Photodetectors, Optical simulations, Quantum wells, Light sources, Simulink, Fabry–Perot interferometers, Multimode fibers

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Proceedings Article | 14 December 1992 Paper

Propagation characteristics in multilayred dielectric periodic structures

João Crisóstomo Costa

Proceedings Volume 1929, 19296M (1992) https://doi.org/10.1117/12.2298355

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Showing 5 of 30 publications

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