- Air-filled fiber transported 51.3 Tb/s over 206.5 km unassisted
- Researchers push 1.2 Tb/s across each wavelength over record distances
- AI infrastructure increasingly relies on networks to move data everywhere faster
Chinese fiber manufacturer YOFC says it has completed a hollow core fiber transmission test that reached 51.3 Tb/s over 206.5 km without regeneration.
The demonstration involved collaboration with China Telecom and optical equipment manufacturer Dekoli using a live network rather than laboratory conditions only.
The researchers achieved a transmission rate of 1.2 Tb/s per wavelength by avoiding intermediate signal regeneration equipment along the entire route.
A different type of fiber built around air instead of glass.
Unlike conventional optical cables that guide light through solid silica cores, hollow core fiber transmits signals through air-filled channels.
That architectural difference allows light to travel faster while reducing various optical distortions that traditionally limit the efficiency of distance transmission.
YOFC previously stated that its hollow core technology could deliver 31% lower latency and transmission speeds would improve by 47%.
The company now claims that the latest test establishes the highest non-repeat wavelength division multiplexing capability ever demonstrated under field conditions.
The researchers described the achievement as the world’s first field deployment combining 1.2 Tb/s wavelengths with a range of 206.5 km.
Previous demonstrations achieved comparable transmission speeds within about 20 km, while longer experiments typically sacrificed substantial amounts of total capacity.
The test relied exclusively on erbium-doped fiber amplifiers rather than remote pumped amplification systems often required for comparable distances.
Historically, commercial deployments of hollow cores have had problems with signal attenuation, making long transmission distances without repetition difficult to maintain economically.
Network cables become the next IT bottleneck
The research team addressed those limitations by using adaptive allocation techniques that independently adjusted channel speeds and optical power at all wavelengths.
That approach enabled hybrid transmission configurations while reducing losses associated with the unique gas absorption effects of air-guided optical signals.
Engineers also developed a high-power amplifier capable of producing an output of 33.5 dBm while maintaining relatively uniform gain characteristics.
Because transmitting optical power close to 2.24 W introduces operational risks, several automatic protection systems monitored link behavior continuously during testing.
Safeguards included anomaly detection systems, automatic shutdown functions, and alarm-triggered responses designed to prevent costly equipment failures during operation.
The timing of the experiment coincides with growing demand for artificial intelligence tools that require unprecedented movement of information between data centers around the world.
Large clusters of GPUs become increasingly dependent on network performance, creating limitations that processors alone cannot address through additional computing resources.
Lower latency streaming could allow operators to distribute facilities further apart without incurring penalties that impact training and inference performance.
YOFC believes the trial marks progress towards broader deployment, although competitive hollow core ecosystems are rapidly emerging outside of China’s supply chains.
Whether such experiments eliminate bandwidth bottlenecks remains uncertain, although networking limitations appear increasingly important as computing limitations themselves.
Via Tom Hardware
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