689 Gbps single-wavelength mode-division multiplexing free-space optical transmission in strong turbulence

By employing successive interference cancellation decoder and redundant receive channels, we achieved a record-high line rate of 689 Gbit/s, channel number of 10, and net spectral efficiency of 13.9 bit/s/Hz in single-wavelength mode-division multiplexing free-space optical transmission under strong turbulence.