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We present a proof of concept demonstration of THz free-space communication employing orbital angular momentum (OAM) multiplexing. Two different OAM modes are multiplexed and de-multiplexed in experiment via 3D printed spiral phase plates.
A multicasting fiber optic switch employing a liquid crystal on silicon spatial light modulator is used to demonstrate wavefront encoding, a novel technique for crosstalk mitigation. Experimentally we reduce worst case crosstalk by 7.5dB.
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