Radio-over-free-space-optics (Ro-FSO) is a promising technique to distribute
radio frequency (RF) signals over the atmosphere using optical carriers. In
this work, we designed a 60Gbps-120GHz OFDM-Ro-FSO transmission system in
conjunction with mode division multiplexing. Three independent 40 GHz radio signal
are optically modulated at 20 Gbps and transported over a secure free-space link
of 50 km by mode division multiplexing of three Hermite-Guassian modes HG 00,
HG 01 and HG 02.
Keywords: Hermite-Gaussian modes, Mode division multiplexing, OFDM, Ro-FSO.
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