Abstract

Using two-dimensional (2-D) scattering matrix theory, the switching behavior of inplane waveguided 2 x 2 resonant optical switches in silicon-on-insulator was analyzed at the 1.33,1.55, and 10.6 µm wavelengths. The switch consisted of two straight bus waveguides coupled independently and laterally to a pair of microring resonators. Switching actuated by a Delta n + i Delta kappa¯ complex index perturbation of the rings was investigated. The switching effects discussed include the free-carrier-plasma dispersion, Franz-Keldysh, quantum-confined Stark, Kerr, and thermooptic effects. Each effect has its Delta kappa¯/Delta n signature. For waveguides < or = 0.3 lambda wide, an optimum switch design was determined in the weak coupling regime. Complete switching was found for Delta n ~ 2 x 10^-2, together with significant modulation for Delta n in the 10^-4 range.

© 2005 IEEE

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