Transmission of Hybrid Probabilistically and Geometrically Shaped 256QAM at 49-Gbaud in a 50-GHz Spacing WDM System

We experimentally demonstrated 10×614.4-Gbps 256QAM coherent WDM transmission over 400-km SSMF based on a new hybrid probabilistically and geometrically shaped signal with 50-GHz frequency spacing, obtaining 2-dB shaping gain compared with regular 256QAM.