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This research paper presents a novel high bit rate and spectral efficient 20 Gb/s mode division multiplexed (MDM) radio over free space optical communication (MDM-RoFSO) system. 10 Gb/s MZM/QAM-16 modulated data streams, each from two distinct channels, are transported over two spirals phased Hermite Gaussian (HG) laser modes, HG00 and HG01 respectively. These two HG channels are multiplexed using MDM at a 10 GHz RF signal, amplified and transmitted over the atmospheric link at an opticaldoi:10.21203/rs.3.rs-2072539/v1 fatcat:ojroaafwyjghtjvep7fwmcxloe