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NTT, NTT Innovative Devices and Keysight reported a 280 Gbps data rate in the 300 GHz band on June 16, 2025. The result is a sub-terahertz research and measurement milestone for future 6G systems—not a commercial 6G network, smartphone download test or household-internet speed.
What record was set?
The companies said their system reached 280 Gbps at around 300 GHz, exceeding the 240 Gbps milestone cited in Keysight’s announcement. The result was produced with a wideband J-band amplifier covering approximately 220–325 GHz and an output level of 0 dBm (about 1 milliwatt at the measurement reference).
NTT and its partners described the work as a world-record data rate for a signal-generation system intended to accelerate 6G research. The result was scheduled for presentation at the 2025 IEEE MTT-S International Microwave Symposium. See the NTT announcement and Keysight’s technical release.
“World record” here means the organizations’ claim for this specific type of 300 GHz-band data-rate demonstration. It does not mean the fastest internet connection of any kind.
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Who conducted the demonstration?
- NTT Corporation: 6G and communications research.
- NTT Innovative Devices: the wideband indium-phosphide (InP) J-band power-amplifier technology.
- Keysight Technologies: vector-component analysis and high-speed measurement equipment.
How did the 280-Gbps test work?
A wideband sub-terahertz amplifier
The amplifier operated across the J band, roughly 220–325 GHz. Such bandwidth gives engineers more room to carry data, but it also makes every part of the signal chain—amplifier, connectors, waveguides, antennas and test instruments—harder to design and calibrate.
Vector-component analysis
Keysight used a vector component analyzer based on its N524XB PNA-X Microwave Network Analyzer family to characterize the high-speed signal. This is laboratory instrumentation, not a modem or phone radio.
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Digital predistortion
At very high frequency, power and bandwidth, amplifiers become less linear. Digital predistortion intentionally adjusts the input waveform to compensate for expected nonlinear behavior. That helps keep the measured signal sufficiently clean for high-order modulation and wideband analysis.
Why explore 300 GHz for 6G?
Sub-terahertz frequencies—often discussed as roughly 100–300 GHz—can offer very wide channels and therefore extremely high peak rates. NTT identifies the range as a candidate for ultra-high-speed communications and high-precision sensing.
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The trade-off is propagation. Compared with lower cellular bands, a 300 GHz link is generally expected to have higher free-space loss, poorer penetration through walls and objects, greater sensitivity to blockage, tighter beam alignment requirements and a shorter practical range. Those constraints make the band more plausible for short-range, high-capacity uses such as indoor hotspots, device-to-device links, fixed access, backhaul or sensing than as a direct replacement for low-band wide-area coverage.
What the 280 Gbps number does—and does not—measure
It is a peak research data rate
The announcement describes a signal-generation and measurement system. It does not establish a normal handset receiving 280 Gbps over a stated distance, nor does it report sustained application throughput, cell-edge performance, upload speed, latency or end-to-end internet delivery.
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- The gauge owns high hardness, strong wear resistance and low deformation rate. It maintains stable and precise measuring accuracy after long-term repeated use, not easy to wear out helping you quickly and accurately judge whether screw threads are qualified or defective.
- With fine thread cutting and smooth surface, this thread ring gauge provides accurate and consistent test results, ensuring reliable quality inspection for all kinds of external threaded workpieces.
- The permanent marking is wear-proof and easy to recognize, effectively avoiding misoperation and improving working efficiency in workshop inspection.
- Suitable for machinery manufacturing, hardware processing, factory quality inspection, equipment maintenance and mechanical repair
0 dBm is not a phone-power claim
The reported 0 dBm is a laboratory output specification at the relevant reference point. It does not describe the radiated power, coverage, battery drain or received signal level of a future consumer device.
“For 6G” is a development target
The demonstration supports hardware and test development for possible future 6G systems. It does not define a finalized 6G standard, a globally harmonized 300 GHz cellular allocation, a consumer-device specification or a guaranteed launch date.
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How this compares with other demonstrations
Rates from unlike experiments should not be ranked as one universal “6G speed.” Frequency, bandwidth, distance, antennas, coding, spatial streams, equipment and whether the figure was generated, transmitted, received or decoded all change the meaning.
| Demonstration | Reported rate | Band or medium | What it demonstrates |
|---|---|---|---|
| NTT, NTT Innovative Devices and Keysight | 280 Gbps | 300 GHz sub-terahertz signal-generation system | High-speed 6G component and measurement capability |
| Samsung and KT | Up to 3 Gbps | 7 GHz outdoor test | More field-oriented 6G radio work using X-MIMO; company announcement |
| e& UAE and NYU Abu Dhabi | 145 Gbps | Terahertz 6G pilot | Regional THz pilot demonstration; announcement |
| NICT and partners | 1.02 petabits/s over 1,808 km | Specialized 19-core optical fiber | Long-distance fiber transmission, not a wireless 6G air interface; NICT release |
| UCL and partners | 450 Tbps over 39 km | Existing deployed optical fiber | Optical-network capacity demonstration, not mobile 6G; UCL report |
Why fiber records are not 6G wireless records
Optical experiments can combine many wavelengths, cores or modes in specially engineered fibers and use laboratory-grade transmitters and receivers. A petabit-per-second fiber result therefore measures a different medium and channel structure from a single wireless sub-terahertz link. Fiber may ultimately carry traffic to and from future 6G sites, but its headline capacity is not the speed a 6G handset receives over the air.
What would be needed before consumers see 6G?
A component milestone is only one step. Practical deployment would require:
- standardization and spectrum decisions;
- antennas, beamforming and tracking that work with moving users;
- link budgets that tolerate blockage and weather;
- affordable, efficient radios with manageable heat and power use;
- interoperability, security and mobility support;
- field trials measuring sustained user throughput rather than a laboratory peak; and
- a business case for dense sites or specialized short-range coverage.
Those requirements explain why a controlled 300 GHz result can be hundreds of gigabits per second while a more practical outdoor 7 GHz trial reports up to 3 Gbps: they address different engineering problems.
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Can a current phone reach 280 Gbps?
No. The equipment in this demonstration is specialized research instrumentation and amplifier hardware. The cited announcements provide no consumer 6G service, handset specification or end-to-end user-speed measurement, so the figure cannot be converted directly into a household download time.
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