Engineers from Japan's National Institute of Information and Communications Technology (NICT) have reported a new world record for data-transmission speed over fiber-optic cables. They claim a rate of 319 terabits per second (Tb/s), as opposed to the former highest rate of 178 Tb/s. Most crucially, this achievement has been made over an appreciable length of cable and a potentially feasible tweak of conventional technology.
https://www.notebookcheck.net/A-Japan-based-research-group-breaks-the-world-record-for-internet-speeds.551676.0.html