Limits RegistryPUBLIC RECORD
Limits RegistryA team including UCL researchers achieved a data transmission rate of 450 terabits per second over existing, field-deployed optical fiber in March 2026, using additional wavelength bands beyond what standard equipment uses — a 50% increase over the same team's own 300.28 Tbit/s record from five months earlier. This is distinct from pure laboratory records (Japan's NICT reported 1.02 petabits/s in 2025) which use specially constructed fiber not representative of installed networks.
The question, scope, and sources behind this Registry record.
A team including UCL researchers achieved a data transmission rate of 450 terabits per second over existing, field-deployed optical fiber in March 2026, using additional wavelength bands beyond what standard equipment uses — a 50% increase over the same team's own 300.28 Tbit/s record from five months earlier. This is distinct from pure laboratory records (Japan's NICT reported 1.02 petabits/s in 2025) which use specially constructed fiber not representative of installed networks.
The highest data transmission rate demonstrated over already-installed, commercially deployed optical fiber infrastructure — a different, more practically relevant metric than pure laboratory records set over specially constructed fiber.
Change a parameter to stress-test whether a proposed result is still inside the published specification. This is an audit aid, not a proof checker.
This record has no editable parameters. Read the formal question and assumptions before challenging it.
Current frontiers derived from accepted Claims.
An observed or demonstrated result; no opposing bound is implied.
The frontier is not sacred
Most progress starts with a disagreement that survives contact with evidence. If you can push the known lower bound up or pull the upper bound down, show us the work.
≥ when you have shown that at least this value is achievable.≤ when you have shown that anything above this value is impossible.No vibes. State the value, define the scope, and link the paper, proof, code, or reproduction that lets another person check it. Editors review every challenge before the public record changes.
Challenge this recordAssertions tied to evidence, attribution, and review.
The frontier as it changed over time.
Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.
1 accepted Claim, with 1 linked evidence records.
Permanent ID limitsregistry.com/limits/LR-FASTEST-INTERNET-DEPLOYED
No active verified bounties are linked to this Limit.
View verified bounty tracker ↗No accepted machine-checked reproductions are recorded for this Limit.
Limits Registry. LR-FASTEST-INTERNET-DEPLOYED. Fastest data transmission over deployed fiber infrastructure. 2026.