319 terabits – super Scott! Boffins in Japan accelerates along information highway with new world record • The Register


Japanese researchers broke the world record for the fastest internet speed by transmitting data at 319 terabits per second (Tbps) using a modern compatible fiber-optic cable, according to the leading communications research institute from the country.

The 3,001 km (1,864 mile) optical fiber was designed by engineers at the National Institute of Information and Communications Technology (NICT) Network Research Institute.

The boffins used 4 cores in the fiber to transmit data and applied wavelength division multiplexing (WDM), allowing multiple wavelengths to be sent simultaneously on a single strand of fiber. The individual WDM channels, 552 in this case, were then modulated to form multiple signal sequences at alternating intervals.

The team used a band that was never used for long distance transmissions, the S-band (1460-1530 nm), alongside the usual C and L bands.

Every 70 km of the experimental set-up, the signal was subjected to amplifiers doped with rare earth ions, some with thulium, others with erbium. The boffins also used distributed Raman amplification along the transmission fiber itself to amplify the signal.

The researchers said the system was compatible with modern infrastructure and should soon be adopted because the fiber still has a standard outside diameter of 0.125mm.

But while it may look like your normal fiber from the outside, the transmission rate is 79% faster than the previous world record. located at University College London (UCL) in August 2020 with a data transmission rate of 178Tbps.

While these fibers won’t be entering homes anytime soon, they will likely benefit the larger network structure.

In their canned declaration, the NICTs mentionned:

The results of this experiment were published in International Conference on Fiber Optic Communication in June and announced in English this week. ®


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