Nippon Telegraph And Telephone : Successful field trial of all-Raman optical amplification technology for multiband large capacity transmission of 400 Gbps signals in installed fiber ~ Double the usable bandwidth of installed fiber ~

Nippon Telegraph and Telephone Corporation (Headquarters: Chiyoda-ku, Tokyo, President and CEO: Hiroo Unoura, hereinafter NTT) announced that, in conjunction with Nippon Telegraph and Telephone West Corporation (Headquarters: Osaka Prefecture Osaka City, President: Kazutoshi Murao), successfully conducted a field trial on widely-installed optical fiber cable, in which, through the appropriate use of 'all-Raman optical amplification technology' as transmission line repeaters, 400 Gbps signals were transmitted in multiple bands at the same time. Furthermore, we confirmed, through this field trial, that we can add signals in a new band without affecting the signals in the existing band.

The results of this field trial suggest the possibility of achieving ultra-high capacity transmission speeds of up 30 Tbps. These speeds, together with the ability to upgrade systems already in use will be needed to satisfy the demands imposed by communication between data centers. We are continuing to verify the ultimate performance limits in detail as well as operational aspects, with the goal being to contribute to various fields that require ultra large capacity transmission.