Abstract
A new orbital angular momentum (OAM) mode and polarization multiplexing transmission system in the millimeter-wave range is proposed for future Ultra high capacity backhaul/fronthaul radio. Our theoretical analysis reveals that all the OAM modes can be used with polarization transmission while maintaining high degree of orthogonality. Furthermore, we show that links in the order of 100m can be achieved using the OAM lower-order modes in the millimeter-wave bands. A combination of an antenna array and a Butler matrix can encode and decode multiple OAM modes. We achieved 7-m transmission with two-modes multiplexing with a prototype of our system at 5.2 GHz. This translates to over 100m when applied to the mmwave bands. The experimental results agree well with the theoretical analysis, and are verifies our estimation of available link distance.
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