High-capacity short-distance wireless communications in the terahertz (THz) range are anticipated and therefore have been intensively studied. Higher data rates are made possible by the introduction of frequency division multiplexing (FDM) and polarization division multiplexing (PDM) schemes in the THz range. In this paper, wireless data transmissions using 2-channel FDM in the 500 and 800 GHz ranges and PDM in the 500 GHz range are demonstrated using resonant-tunneling-diode oscillators with different frequencies and polarizations integrated into one chip. Transmissions at a data rate of 28 Gbit/s were achieved in each channel with an error rate below the forward error correction limit in both multiplexing systems. The ratios of the leakage of the transmitted signal in one channel into the other channel were about −40 and −30 dB in FDM and PDM modes, respectively.
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