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Hybrid Silicon Photonics for Optical Interconnects

In this paper, we review the hybrid silicon photonic integration platform and its use for optical links. In this platform, a III/V layer is bonded to a fully processed silicon-on-insulator wafer. By changing the bandgap of the III/V quantum wells (QW), low-threshold-current lasers, high-speed modulators, and photodetectors can be fabricated operating at wavelengths of 1.55 μm. With a QW intermixing technology, these components can be integrated with each other and a complete high-speed optical interconnect can be realized on-chip. The hybrid silicon bonding and process technology are fully compatible with CMOS-processed wafers because high-temperature steps and contamination are avoided. Full wafer bonding is possible, allowing for low-cost and large-volume device fabrication.