NTT tests 400Gbps optical technology for Internet backbone | Network World

400 thousand million bits per second over a single color in the light spectrum. At the same time that a single pulse of light can be divided into multiple, ever-increasing numbers of colors. All along existing in-place fiber optic strands.

http://www.networkworld.com/article/2603502/ntt-tests-400gbps-optical-technology-for-internet-backbone.html?source=NWWNLE_nlt_wan_2014-09-09#tk.rss_lanwan