Abstract
This paper presents two types of Si-based optical waveguides; one confines light by the total internal reflection and the other by the Bragg reflection. The former called photonic wire waveguide allows low loss and wideband light transmission through sharp bends and micro-optic components. Therefore, it is suitable for dense optical wiring in large-scale photonic integrated circuits. By using this waveguide, an arrayed waveguide grating demultiplexer is dramatically miniaturized. The latter called photonic crystal waveguide is unique on this point that it generates slow light having an extremely low group velocity. By controlling operating bandwidth and dispersion, it will be applicable to an optical buffer and high efficiency light control device.
