300 km transmission of 10 Gbit/s chirped duobinary signals using two Mach-Zehnder modulators

300 km error-free transmission of 10 Gbit/s chirped duobinary signals over dispersion-uncompensated standard singlemode fibre is demonstrated. The record transmission distance is achieved by using two LiNbO 3 Mach-Zehnder modulators driven only with electrical binary signals.