We demonstrate the multiplexing/demultiplexing of pol-muxed 22 orbital angular momentum (OAM) modes. Using 17.9-Gbit/s OFDM/OQAM 64-QAM signals over pol-muxed 22 OAM modes (44 channels in total), we achieve an ultra-high spectral efficiency of 230 bit/s/Hz.
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