Acopladores de cristais fotÃnicos e acesso mÃltiplo por divisÃo de cÃdigo Ãptico (OCDMA) com pulsos ultracurtos em fibras de Bragg / Photonic crystals couplers and optical code division multiple access (OCDMA) with optical ultra-short pulses in linear fiber Bragg gratings
AUTOR(ES)
Marcus VinÃcius Pinheiro Lopes
FONTE
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia
DATA DE PUBLICAÇÃO
28/02/2012
RESUMO
This paper presents numerical simulation studies of propagation/switching of ultra-short pulses in photonic crystal couplers and Optical Code Division Multiple Access (OCDMA) using Fiber Bragg Grating (FBG). For coding were obtained analytically Gold codes. In the analysis of photonic crystal couplers (microstructured) investigated the properties of the propagation of light pulses as SÃlitons. Ultra-short pulses of minimum duration of 100 femtoseconds (fs) were used. For this type of propagation in couplers, must be solved numerically the Equation nonlinear SchrÃdinger Generalized (ENLSG) of the coupled modes in accordance with the addition of third order dispersion, intrapulse Raman scattering, self-steepening and the dispersion of coupling coefficient. A coupler with coupling length of 1.8 cm and length 33 cm was simulated. Using this device length, the high-order effects (dispersion, self-steepening, raman, dispersion of the coupling) were important factors to consider. But, for small devices, with up to two coupling lengths, these effects may be ignored. In the second analysis, we studied the coding range of 5 Gold codes using an FBG encoder/decoder of length 41.58 mm. For the grid used, the encoding amplitude and interference between users of this device have been investigated. There was an increase of interference by adding values of users starting from 6 dB to about 10.5 dB for this device. Using photonic couplers with the FBG linear switching pulses between the channels of the coupler could be visualized to high gains (from 50 decibels).
ASSUNTO(S)
engenharias teleinformÃtica acesso mÃltiplo por divisÃo de cÃdigos fibras Ãticas coupler bragg grating coding microstructured fibers
ACESSO AO ARTIGO
http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7197Documentos Relacionados
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