Succeeded in record-breaking 16-level per symbol 40 Gbit/s optical transmission
Hitachi, Ltd. (NYSE:HIT / TSE:6501), has succeeded in 40 Gbit/s optical transmission using 16-level per symbol multi-level modulation, the highest number of signal levels per symbol in high speed optical transmission to be reported to date, for application in next generation trunk line (inter-city) and metropolitan (intra-city) optical fiber networks.

