symbolset (646467) writes "NTT and some partners, in a late paper to the ECOC 2012, show a successful transmission of 1 petabit per second data transfer over a 12-core optical fiber 52.4 km long." Link to Original Source
(1) Never draw what you can copy.
(2) Never copy what you can trace.
(3) Never trace what you can cut out and paste down.