Multi-kilometre and multi-gigabit-per-second sub-terahertz communications for wireless backhaul applications

Sub-terahertz- and terahertz-band-that is, from 100 GHz to 10 THz-communication technologies will be required for next-generation (6G and beyond) wireless communication networks. Considerable progress has been made in terahertz device technology for personal and local area networks, but there are many applications that could benefit from the large capacity of sub-terahertz and terahertz wireless links if longer communication distances were possible. The generation of high-power information-bearing ultrabroadband signals for long-distance communication is though challenging. Here we report a multi-kilometre and multi-gigabit-per-second link operating at 210-240 GHz. We use on-chip power-combining frequency multiplier designs based on Schottky diode technology to achieve a transmit power of 200 mW. A tailored software-defined ultrabroadband digital signal processing back end is also used to generate the modulated signal and process it in the receiver.