16×200 GBPS virtual carrier assisted DD transmission over 80 km with only 14 GHz of digitizer bandwidth

By employing a 112 GSa/s SiGe BiCMOS 1-to-4 ADC front-end, we demonstrate a WDM direct detection transmission with a net data rate per channel of 200 Gb/s over 80 km using only 14 GHz of receiver's digitizer bandwidth