Improving the performance of all-optical switching based on nonlinear photonic Crystal microring resonators

Photonic crystal microring resonators are suitable devices for all-optical integrated circuits. Small size of the structure without radiation loss and topology of structure make these microrings more flexible in design. The light intensity can also be localized inside them, which is appropriate for nonlinear state. This localization and slow group velocity of light in photonic crystals lead to enhancement of nonlinearity within nonlinear photonic crystal microring resonators. So they can be used as active devices in all-optical integrated circuits which are under wide range of researches recently. In this paper, the nonlinear photonic crystal microring resonator is introduced and three different structures for all-optical switching based on them are proposed and their performances are simulated. Also the three structures are compared and the optimal structure is demonstrated. Required power for switching of optimal structure is 0.5655 W.