Successful IEEE 802.11n 2-channel MIMO transmission over standard graded index multimode fiber in passband

We present a successful transmission of an IEEE 802.11n 2×2 Multiple Input - Multiple Output radio signal over standard graded index multimode fiber at several kilometers length. For the first time commercially available Access Points were used in the MIMO over multimode fiber experiment. Transmission was carried above the baseband of the multimode fiber (in passband), the electrical carrier was at 2.4 GHz. The experiment indicated an increase in the bitrates in the MIMO mode versus single channel operation. It has to be emphasized we have measured a real payload bitrate of the system.