A cutting edge, “off-line” signal transmission mechanism, experimentally demonstrated just a few years ago, is now on-line as a real-time bidirectional transmission system. At OFC 2018, the single-most important annual event in optical communications, being held March 11-15 in San Diego California, a research team from Nokia will report the real-time, bi-directional transmission of 78 interleaved, 400 gigabit per second (Gb/s) channels with a 31.2 terabit per second (Tb/s) fiber capacity.