Intra-chip optical interconnection based on polarization division multiplexing photonic integrated circuit

We proposed a polarization division multiplexed (PDM) silicon photonic integrated circuit (PIC) suitable for intra-chip optical interconnection. The PDM PIC is composed of two micro-ring modulators, two gain peaked germanium photodetectors and the multiplexer as well as demultiplexer based on polarization rotator splitter. 20 Gb/s on-chip PDM system is successfully demonstrated with clear eye diagrams. Under 10−9 bit error ratio level, the power penalty is about 1 dB between the single and dual polarization tributes, which validates the superior link performance of the proposed PIC.