All-optical integrated logic gates based on intensity-dependent transverse modal coupling
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- Mateo, E.F. & liñares, J. Optical and Quantum Electronics (2003) 35: 1221. doi:10.1023/B:OQEL.0000004632.17917.47
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We present a study of the spatial propagation of light in a third order planar step-index waveguide with a transverse parabolic width film. By using the Lagrangian formalism, the width and phase evolution of a Gaussian beam has been completely described showing both the refractive contributions of the lens-like waveguiding geometry and self-focusing nonlinearity. As a result of this study, we have proposed the design of a new kind of integrated all-optical devices which, by means of the spatial beam power modulation and its influence on the transverse modal coupling can operate as phase-insensitive AND, OR and XOR logic gates.