Spanning from conception to realization of main photonics functionalities in an optically integrated circuit. This includes the active or passive photonic circuit integrated with on-chip optical sources and efficiently coupled to external optical fibers. Photonic integrated platforms are based on SiO2, SiN, SOI and related layers. Building blocks span from waveguides, power and polarization splitters and rotators, mode adapters, lattice and resonant filters, Si and SiGe modulators, Ge detectors, switches. Photonic/electronic integration is also pursued to demonstrate energy-efficient large bandwidth densities for on-board and edge interconnections.