Advances in terahertz communications accelerated by photonics

By Tadao Nagatsuma, G. Ducournau, Cyril C. Renaud. Nature Photonics, 2016

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Terahertz Band: The Last Piece of RF Spectrum Puzzle for Communication Systems (2019, background): “These devices have broadband characteristics, high modulation index as well as high-speed amplitude and/or phase coding introduced from optical coherent network technologies [112].”
An Overview of Signal Processing Techniques for Terahertz Communications (2020, background): “allowed efficient signal generation, modulation, and radiation [32], [34]–[36].”
What should 6G be? (2019, background): “The hybrid link offers plenty of bandwidth for signal transmission and has the immunity to adverse weather conditions [78].”
6G and Beyond: The Future of Wireless Communications Systems (2020, background): “In addition to the promised Tbps-level links for cellular systems, THz-band spectrum can also be leveraged for the following scenarios : • Local Area Networks: Several spectrum windows are feasible for short-range links within ten meters, including 625 − 725 GHz and 780 − 910 GHz [18].”
Terahertz Band Communication: An Old Problem Revisited and Research Directions for the Next Decade (2021, background): “…Generation (DFG): The fundamental idea of DFG systems is the reciprocal to that of frequency-multiplied electronic systems: a THz carrier signal can be generated by photomixing two optical carrier signals whose wavelength differs by an increment that corresponds to the target THz signal [24], [52].”