1.2 Tb/s/λ Real Time Mode Division Multiplexing Free Space Optical Communication with Commercial 400G Open and Disaggregated Transponders

We experimentally demonstrate real time mode division multiplexing free space optical communication with commercial 400 G open and disaggregated transponders. As proof of concept, using $\mathrm{HG}_{00}, \mathrm{HG}_{10}$, and HG01 modes, we transmit $1.2 \mathrm{~Tb} / \mathrm{s} / \lambda(3 \times 1 \lambda \times 400 \mathrm{~Gb} / \mathrm{s})$ error free.