Real-time direct-detection of quad-carrier 200Gbps 16QAM-DMT with directly modulated laser

We demonstrated four-channel WDM 256.51Gb/s 16QAM-DMT short-reach optical-amplifier-free inter-connection with real-time reception. We achieved highest capacity DMT signal transmission over 2.4-km SMF with the BER under SD-FEC limitation of 2.4×1 0-2.