Integrated microwave photonics

Microwave signal generation using the heterogeneous photonic integration platform is described. Preliminary results from a heterogeneously integrated photonic microwave signal generator are shown. Heterogeneous integration, as was recently demonstrated, allows for superior performance of certain devices compared to purely III-V devices and we outline the benefits it brings. Finally, we address narrow-linewidth tunable lasers as one of key components of low phase noise photonic microwave signal generators and show the possibility of achieving sub-kHz linewidths by utilizing on-chip high-Q ring resonators.