Real-Time Point-to-Multipoint for Coherent Optical Broadcast and Aggregation – Enabled by Digital Subcarrier Multiplexing

We report on the first real-time operation of coherent point-to-multipoint in high-speed fiber-optic communications. The broadcast and aggregation network consists of a 400 Gb/s hub transceiver achieving post-FEC error-free communication with 4 × 100 Gb/s leaf nodes, 5 – 50 km away.