Artigos Científicos - ITEC
URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/3360
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Navegando Artigos Científicos - ITEC por Assunto "Algoritmos genéticos"
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Artigo de Periódico Acesso aberto (Open Access) FBG optimization using spline encoded evolution strategy(2011-06) SOUSA, Marco José de; COSTA, João Crisóstomo Weyl Albuquerque; SOUZA, Remo Magalhães de; PANTOJA, Ramon Villar Monte PalmaThis paper presents an encoding scheme adapted for Fiber Bragg Grating (FBG) optimization using metaheuristics. The proposed encoding scheme uses spline approximations in order to build softened refractive index profiles from few encoded parameters. This approach is suitable for Fiber Bragg Grating (FBG) synthesis because it ensures both the reduction of the problem dimensionality and the respect of important restrictions associated to the FBG manufacture. Simulations are shown where an ES using the spline encoding was able to converge faster and produce more interesting filters, when compared with conventional encoding schemes.Artigo de Periódico Acesso aberto (Open Access) Wavelength assignment using a hybrid evolutionary computation to reduce cross-phase modulation(2014-06) MIRANDA, André Moacir Lage; LIMA, Fabio de Oliveira; ROCHA, Helder Roberto de Oliveira; VIJAYKUMAR, Nandamudi Lankalapalli; FRANCÊS, Carlos Renato Lisboa; SEGATTO, Marcelo Eduardo Vieira; COSTA, João Crisóstomo Weyl AlbuquerqueIn this paper, we propose a hybrid methodology based on Graph-Coloring and Genetic Algorithm (GA) to solve the Wavelength Assignment (WA) problem in optical networks, impaired by physical layer effects. Our proposal was developed for a static scenario where the physical topology and traffic matrix are known a priori. First, we used fixed shortest-path routing to attend demand requests over the physical topology and the graph-coloring algorithm to minimize the number of necessary wavelengths. Then, we applied the genetic algorithm to solve WA. The GA finds the wavelength activation order on the wavelengths grid with the aim of reducing the Cross-Phase Modulation (XPM) effect; the variance due to the XPM was used as a function of fitness to evaluate the feasibility of the selected WA solution. Its performance is compared with the First-Fit algorithm in two different scenarios, and has shown a reduction in blocking probability up to 37.14% when considered both XPM and residual dispersion effects and up to 71.42% when only considered XPM effect. Moreover, it was possible to reduce by 57.14% the number of wavelengths.