Functional photonic devices based on silicon wire waveguide

We demonstrate our recent progress in functional photonic devices based on a silicon wire waveguide. The propagation loss of the waveguide has been reduced to around 2 dB/cm, and the inorganic low-loss fiber coupling structure has been completed. For passive functions, we have developed ring resonators and apodized lattice filters for add/drop filtering devices. The ring resonators realized very high Q values of around 20,000. The lattice filters realized large free spectral range and low cross-talk. For active, or nonlinear function, we demonstrate all-optical wavelength conversion based on the four-wave-mixing effect. The conversion efficiency was -12 dB, and clear eye-patterns of the converted signal are observed at 10 Gbps operation.