Three organizations, National Institute of Information and Communications Technology, Sumitomo Electric, and Optoquest, announced that they jointly succeeded in the communication experiment to get a transmission speed of 109 terabits per second using an optical fiber. The speed of 109 terabits is one million times faster than the speed of the optical fiber widespread in households. They realized this achievement using the original technology to increase the number of passages inside an optical fiber, and believe that they will be able to further increase the transmission speed using the same technology. They increase the number of the passage of light called “core” from one to seven. Increasing the number of cores is supposed to deteriorate transmission because the signal in each core affects each other, but they successfully solved this problem by developing the structure that makes it hard for signals to leak out and opened up the way for practical application. In the experiment, they successfully transmitted numerical data at 109 terabits per second for a distance of 16.8 km. It is about 1.6 times faster than the existing speed of 69.1 terabits per second. This speed means that a two-hour film of the full high definition quality can be transmitted in 0.1 second without compression.