The highest internet speed ever recorded was recently doubled by engineers in Japan. The research, called “High-Speed Direct Detection Demonstrations,” was published by the National Institute of Information & Communication Technology (NICT) and submitted to the International Conference on Optical Fiber Communications.
The old internet speed world record was 178 terabits per second (Tb/s), set in 2020 by the United Kingdom and Japanese engineers. The new record set by Japanese researchers is now 319 Tb/s, doubling the previous record. The team maintained this super-fast speed over a long distance with no speed drop-off or bandwidth change over 1,865 miles.
A novel cable, a four-core optical fiber using 552 PDM-16QAM wavelength-division multiplexed channels, was used. The engineers used “erbium and thulium doped-fiber amplifiers and distributed Raman amplification” to achieve their feat.
Additionally, S, C, and L band transmissions were used for the first time. It is typical for C and L bands to be used for long-haul communications, but the researchers used S-band as well.
The four-core optical fiber works with existing equipment, making it more cost-efficient to implement.
Engineers believe there are more capabilities for even faster speed and further increases to transmission capacity. They are going to be working to “extend the transmission range to trans-oceanic distances” as well.
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