Si photonics enables the integration of photonics with electronics, making it to be an attractive platform for compact and
highly functional devices. By incorporating photonics crystal waveguides (PCWs) and other slow-light nanostructures,
optical devices can be made compact as well as having additional functionality. Furthermore, fabricating these devices
using existing CMOS process is crucial for their low-cost mass production. In this paper, we report our recent results on
CMOS-fabricated, integrated PCW and other slow-light devices, including tunable delays, high-nonlinearity devices,
optical modulators and DQPSK receivers.