80Gb/s PDM-QPSK PIC-to-PIC transmission based on integrated hybrid silicon/III-V wavelength-tunable transmitter and monolithic silicon coherent receiver

We reported the first hybrid Ill-V/Si integrated QPSK wavelength-tunable transmitter based on high-speed ring modulators (BW∼23GHz). 80 Gbit/s PDM-QPSK signal transmission over 100 km with said integrated hybrid transmitter as well as a fully packaged silicon-based coherent receiver is demonstrated.