Japanese researchers recently hit the 6G milestone, and they succeeded 112 Gbps wireless transmission to 560 GHz—the first time anyone has pushed wireless speeds beyond 100 Gbps beyond the 420 GHz limit. That’s about it 375 times faster there is today’s 5G speed of 300 Mbps.
But here’s the twist: this isn’t about making your phone faster. This breakthrough also targets the invisible infrastructure that connects cell towers to the Internet backbone.
Microcomb Technology Shrinks Lab Equipment into Pocket-Size Spaces
Photonic chips eliminate the alignment headaches that plagued previous terahertz systems.
A team from the University of Tokushima has solved an engineering problem that has been used for years by terahertz research. Previous attempts to generate clean signals above 350 GHz required large laser setups with “microscope-level alignment”—the kind of dim lab equipment that falls apart if someone slams a door too hard.
Their solution? Visible microcombs integrated directly with silicon nitride chips. These “optical rulers” generate very stable light waves that convert into terahertz waves without the delicate alignment of free space. Result: just a transmitter 5 mm in diameter compared to the 450mm monsters required by standard systems.
The breakthrough, published in Communications Engineering in May, used injection-molded microcombs with QPSK again 16QAM switch to achieve data rates that previous electronic systems could not approach above 350 GHz.
Why 6G Networks Need Frequencies This High
Low spectrum bands are already saturated with 5G signals, forcing next-generation networks into uncharted terahertz territory.
Think of the wireless spectrum as Manhattan real estate—all the prime spots below 100 GHz have been taken up by 5G, WiFi, and legacy systems. Beating the theory 1 Tbps speed outlining the ambitions of 6G, networks need open bandwidth in excess of 350 GHz.
The problem? Electronic circuits that work best at these frequencies, suffer from weak signals and phase noise that can quickly scramble data rather than automatically corrupt your documents. By using photonics instead of conventional electronics, a Japanese team has generated pure terahertz signals with 84gbps using basic variables and 112 Gbps with improved encoding.
Previous attempts at wireless communication over 350-420 GHz have struggled to reach even 1 Gbps due to power limitations and signal instability.
Wireless Backhaul May Replace Fiber Connections
Super-fast terahertz links may eliminate the need for underground cables between cell towers.
This technology targets wireless backhaul—a high-capacity connection that connects base stations to critical networks. Currently, that means expensive fiber optic cables that require trenching, permits, and months of construction.
According to another writer Takeshi Yasuithis represents “a major step towards 6G wireless systems and high-speed mobile backhaul.” Imagine using 6G small cells as easily as satellite dishes, without waiting for operators to take over the roads.
I 560 GHz frequency band it sits in the terahertz range above the millimeter waves used by 5G, providing greater bandwidth for backhaul applications where line-of-sight connections between towers are possible.
With commercial 6G networks expected around 2030Japan’s terahertz breakthrough positions the technology as more than a lab curiosity—it’s the foundational work of an infrastructure that could make gigabit speeds as common as WiFi.