Analise da influencia do perfil de indice de refração nas perdas de radiação em guias dieletricos curvados

AUTOR(ES)
DATA DE PUBLICAÇÃO

1990

RESUMO

A study of the influence of the index of refraction profile on the radiation due to bends in optical waveguides is developed in this work. One ofthe main objectives is that of confirming the prediction that considerable radiation loss reduction in curved dielectric waveguide is possible to be achieved by an appropriate choice of the index of refraction profile. Five different configurations of rectangular dielectric waveguides with a step index profile are initially studied. They are: a) step lateral profile; b) step vertical profile on the upper face; c) step vertical profile on the lower face; d) step vertical profile on both, upper and lower faces; and e) step double layer vertical profile, with the two dielectric layers on the upper face. Each profile is examined separately for the channel and for the rib waveguides. Expressions are obtained for: a) the propagation constants along the x and y directions; b) the conversion loss coefficient; and c) the attenuation coefficient. Various curves relating the losses with other waveguide parameters are also shown. In addition, a theory for the design of anisotropic dielectric waveguides with tapers and/or bends is also presented. The study is developed using generali~ed coordinate systems. Index of refraction profiles are obtained for the waveguide having a field configuration in each of its cross-section independent of the longitudinal coordinate, such that no power is transfered to othei guided modes or to radiated modes

ASSUNTO(S)

refração guias de ondas oticas otica

ACESSO AO ARTIGO

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