Soliton microcombs have pushed wireless transmission to a record-breaking 112 Gbps at 560 GHz, a significant milestone for 6G technology. This achievement overcomes the limitations of conventional electronics beyond 350 GHz, paving the way for ultra-high-speed mobile backhaul and future 6G networks.
The Japanese research team's breakthrough involves integrating advanced photonics and high-order data modulation, enabling a 100 Gbps-class wireless transmission beyond 420 GHz. By using optical microcombs, which generate ultra-stable laser light lines, they achieved an astonishing 112 Gbps data rate over a 560 GHz carrier wave. This technology can download multiple 4K movies in a fraction of a second, surpassing current experimental systems.
One of the key innovations is the direct bonding of an optical fiber to a silicon nitride microresonator, which minimizes alignment issues and enables high-power optical pumping. This miniaturized device, combined with temperature control, enhances stability and robustness against environmental fluctuations.
The researchers isolated two stable optical carrier signals from the microcomb and coded them using QPSK and 16QAM modulation formats, maximizing data density. The system's performance is impressive, achieving 84 Gbps with QPSK and 112 Gbps with 16QAM modulation.
While 560 GHz frequencies are not accessible to smartphones, this technology is a game-changer for the hidden infrastructure that powers the internet. It has the potential to replace expensive fiber-optic cables with wireless links, connecting cellular towers to the main internet backbone. Telecom companies could use terahertz beams to transmit massive data loads through the air, reducing the need for physical infrastructure.
Looking ahead, the team aims to further suppress phase noise and design advanced antennas to extend the range of these record-breaking speeds. This breakthrough is a significant step towards practical 6G wireless systems and ultra-high-speed mobile backhaul, revolutionizing the way we connect and communicate.
