Real-Time Single-Carrier 800 Gbit/s S+C+L Band Optical Transmission Over 300 km Single-Mode Fiber

In this letter, we demonstrate a real-time S+C+L band optical transmission system with a total transmission capacity of 84 Tbit/s. 105 wavelength division multiplexing (WDM) channels with 150 GHz grid are used to transmit 135 GBaud probabilistic constellation shaping 16 quadrature amplitude modulation (PCS-16QAM) signals. The system only uses doped fiber amplifiers for signal amplification. We adopt self-developed S-band integrated tunable laser assembly (ITLA) with high output power to generate S-band signal. The real-time net data rate of S+C+L band is 800 Gbit/s and the total transmission distance is 300 km. To the best of our knowledge, it is currently the highest real-time net data rate reported in the S band and the farthest transmission distance of real-time S+C+L band transmission systems.