180 Gb/s 64QAM Transmission over 480 km using DFB Laser and Kramers-Kronig Receiver

We experimentally demonstrate a 30 Gbaud 64 QAM transmission over 125 km of single span and 480 km of loop transmission with Kramers-Kronig direct detection using only a DFB laser and a single photodiode for low-cost DCI and metro applications.