  We review our recent progresses on frequency conversion in integrated
devices, focusing primarily on experiments based on strip-loaded and
quantum-well intermixed AlGaAs waveguides, and on CMOS-compatible high-index
doped silica glass waveguides. The former includes both second- and third-order
interactions, demonstrating wavelength conversion by tunable
difference-frequency generation over a bandwidth of more than nm, as well as
broadband self-phase modulation and tunable four-wave mixing. The latter
includes four-wave mixing using low-power continuous-wave light in microring
resonators as well as hyper-parametric oscillation in a high quality factor
resonator, towards the realization of an integrated multiple wavelength source
with important applications for telecommunications, spectroscopy, and
metrology.
