This paper demonstrates a new class of phototunable, on-chip topological terahertz devices for 6G communications, consisting of a 160 Gbit/s communication link and a silicon Valley Photonic Crystal-based demultiplexer. The devices overcome limitations of existing terahertz on-chip communication devices by utilizing topological protection and a high-quality cavity for optically controllable demultiplexing without crosstalk. The researchers successfully demultiplexed 40 Gbit/s signals and streamed uncompressed HD video (1.5 Gbit/s), highlighting the potential of phototunable silicon topological photonics for future 6G and 7G communication.
