Switching cell embedded in photonic crystal

Abstract

We analyze and propose a directional optical coupler embedded in photonic crystal (PhC) for the C, L, and U bands of ITU (International Telecommunications Union), which is driven by an external command signal. Therefore, this switching cell can work in an all-optical switch. The switching method uses a low power external command signal, inserted in the central coupling region, which acts as another waveguide. The switching process is based on the change of the straight state to the cross state owing to the external command signal.