THz Integrated Circuit with a Pixel Array to Multiplex Two 10-Gbit/s QPSK Channels Each on a Different OAM Beam for Mode-Division-Multiplexing

We design and fabricate a pixel-array-based THz integrated circuit for the generation and multiplexing of multiple OAM beams. We experimentally demonstrate a 20-Gbit/s QPSK free-space THz link at 0.317 THz by multiplexing OAM +1 and −1 using the integrated circuit.