All - optical Switch and Digital Light Processing Using Photonic Crystals

We have demonstrated all-optical switching operations by coupled resonator-waveguide systems in two-dimensional Si-based photonic crystals. These systems operate at extremely low power and with a very high switching speed compared with conventional devices using the same nonlinear mechanism due to the use of an ultrasmall resonator with a high quality factor. We also describe an all-optical sequential circuit composed of two resonant tunneling filters. Using a two-dimensional FDTD (finite-difference time-domain) calculation, we numerically demonstrate that an optical digital circuit can synchronize input data with its clock. All-optical Switch and Digital Light Processing Using Photonic Crystals † NTT Basic Research Laboratories Atsugi-shi, 243-0198 Japan E-mail: [email protected]