The latest result relevant to the “world-record data transmission speed” headline is 450 terabits per second (Tb/s), reported by Japan’s National Institute of Information and Communications Technology (NICT) on June 1, 2026. Researchers transmitted that aggregate capacity over 39 km of already-installed optical fiber in London. It is a research demonstration—not a home broadband speed or the rate available to an individual customer.
What the 450 Tb/s record measured
The London link connected University College London’s Roberts Building in Bloomsbury with the Telehouse North data center near Canary Wharf. The signal travelled 19.5 km to the data center and looped back, for 39 km total; NICT says most of the route was underground. NICT described this as the first 450 Tb/s result over field-deployed legacy fiber. The work was presented as a post-deadline paper at the Optical Fiber Communication Conference (OFC) in March 2026. NICT’s June 1, 2026 announcement and UCL’s April 1, 2026 account describe the demonstration and route.
The figure represents aggregate transmission capacity across many optical channels. NICT reports it as a generalized-mutual-information (GMI)-based estimated data rate after transmission over the route. It is not a per-channel result, nor does it describe data delivered to a single device.
How one fiber carried so much data
Instead of sending information on just one optical wavelength, the system used wavelength-division multiplexing (WDM): it carried many wavelength channels simultaneously. NICT reports a 42.4-terahertz-wide signal with up to 1,273 channels spanning the O, E, S, C and L optical bands, from 1,264.0 to 1,617.8 nanometers.
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The team combined those channels with dual-polarization quadrature amplitude modulation (DP-QAM), using up to 256 symbols per constellation. In practical terms, the approach packs information across multiple wavelengths and uses advanced modulation and signal processing to encode and recover it. These are research-system techniques; the aggregate result does not mean a customer channel or household device operated at 450 Tb/s. NICT’s technical announcement gives the system details.
How this compares with other optical-fiber records
“Fastest internet speed” is an imprecise label for these experiments. Results depend on the fiber architecture, whether the route is deployed or experimental, distance, and whether the headline rate is a measured capacity or an estimated data rate. These records therefore should not be treated as a single ranking of interchangeable speeds.
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| Reported result | Fiber and route | How to interpret it |
|---|---|---|
| 450 Tb/s (2026) | 39 km over field-deployed legacy fiber in London | NICT’s result for standard optical fiber and its first 450 Tb/s demonstration over deployed legacy fiber; reported as a GMI-based estimated data rate. NICT, June 1, 2026. |
| 1.02 Pb/s (2025) | 1,808 km using 19-core fiber with a standard cladding diameter and compatible optical amplification | A separate capacity-and-distance demonstration with a different fiber architecture; it is not directly comparable to the London field route. NICT, May 29, 2025. |
| 430 Tb/s (2025) | Commercially available standard-compliant fiber; distance not stated in the cited announcement | An earlier NICT result using a novel transmission approach, preceding the London announcement. NICT, November 11, 2025. |
| 319 Tb/s (2021) | 3,001 km using four-core optical fiber | The historical result behind the earlier IEEE Spectrum headline; a different fiber setup, not the latest result. IEEE Spectrum, 2021. |
The 2025 petabit-per-second result is real, but it used 19-core fiber over a much longer route. The 450 Tb/s figure addresses a different milestone: capacity demonstrated over field-deployed legacy fiber. The cited announcements do not establish one universal record across every optical medium and experimental metric.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why using existing fiber matters—and what it does not prove
Showing that advanced transmission methods can extract greater capacity from installed fiber suggests a way networks might expand capacity without building an entirely new route for every increase in demand. UCL senior author Professor Dame Polina Bayvel said the result demonstrates the potential unused capacity of existing optical-fiber networks, and that adapting and expanding them will be important for growing demand, including from future AI-enabled networks and AI infrastructure. Her statement appears in UCL’s April 2026 report.
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That potential is not evidence that commercial networks can immediately offer this capacity to subscribers. The demonstration relied on research-grade transmission techniques and infrastructure; the reported record is a laboratory-style system result over a field route, not a consumer service specification.
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