4 X 10 GB/S WDM UNREPEATERED TRANSMISSION OVER 525 KM WITH THIRD-ORDER CASCADED PUMPING

The first WDM unrepeatered demonstration using co-propagating distributed Raman and remotely-pumped amplification both based on third order cascaded pumping is reported. The 525 km distance achieved represents the longest unrepeatered distance ever reported at 10Gb/s