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|Title: ||Quiralidade e Não-Linearidade em Fibras Ópticas|
|Authors: ||Janeiro, Fernando M.|
|Keywords: ||Fiber Optics|
Electromagnetic Propagation in Chiral Media
Multi-channel Soliton Communication Systems
Dispersion Management in Optical Communication Systems
|Issue Date: ||Jan-2004|
|Abstract: ||This thesis addresses the effects of chirality and nonlinearity in fiber optics. Most photonic
applications are based on conventional optical fibers in the linear regime. Although nonlinear
effects in fiber optics have been extensively studied, that is not the case with chirality. In fact,
the study of chirality in fiber optics is in its very early stages.
Maxwell’s equations are unified with Einstein’s special theory of relativity through a
tensor formulation of classical electrodynamics. Through the study of a moving dielectric
medium the general concept of bianisotropic media is introduced.
A modified Lorentz model, based on the dipole response of a single helix, is developed.
This model is used to obtain the dispersion behavior of the constitutive parameters of chiral
isotropic media (also known as optically active media).
The study of propagation in a symmetric planar chirowaveguide naturally evolves into
the analysis of the propagation characteristics of chiral optical fibers. Dispersion diagrams for
guided modes, surface and semileaky, are presented. Radiation loss in semileaky modes is also
analyzed. Semileaky modes in chirowaveguides are physically explained through the study of the
reflection problem at a planar interface between chiral media.
Propagation of solitary waves is studied in the framework of multichannel nonlinear
optical communication systems with dispersion management. A Lagrangian formulation is
developed in order to obtain optimal dispersion maps for both filtered and unfiltered optical
communication systems. A good agreement between the results obtained using this variational
approach and the Split-Step Fourier Method was found.|
|Appears in Collections:||CEM - Formação Avançada - Teses de Doutoramento|
FIS - Formação Avançada - Teses de Doutoramento
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