240-Gbps SDM-FSO communication using 4-bundle fiber and 2D photodetector array

We demonstrate a high-data-rate, free-space optical communication through a 4-bundle fiber using a multi-pixel 2D photodetector array. By employing pre-distortion techniques, a 10Gbaud, 64-QAM signal transmission per channel could be successfully achieved (BER< 1x10
^-3
).