Japan's National Institute of Information and Communications Technology, in association with other institutes, set a 402 Tb/s data transfer record over commercially available optical fiber cables. A paper detailing this achievement was presented at the Optical Fiber Communication Conference 2024, held in San Diego. The paper also credits the Aston Institute of Photonic Technologies and Nokia Bell Labs for contributing to this feat.
The NICT and its partners were able to transmit signals through 1,505 channels over 50 km (about 31 miles) of optic fiber cable for this experiment. It used six types of amplifiers and an optical gain equalizer that taps into the unused 37 THz bandwidth to enable the 402 Tb/s transfer speed. One of the amplifiers this was demonstrated with is a thulium-based doped fiber amplifier, which uses C-band or C+L band systems. Additionally, semiconductor optical amplifiers and Raman amplifiers were used, which achieved 256 Tb/s data rate through almost 20 THz. Other amplifiers were also used for this exercise which provided a cumulative bandwidth of 25 THz for up to 119 Tb/s data rate.
