128/spl times/10.66 Gbit/s transmission over 840 km standard SMF with 140 km optical repeater spacing (30.4 dB loss) employing dual-band distributed Raman amplification

We present the first demonstration of a high-capacity (1.28 Tbit/s), long-haul (6/spl times/140 km) WDM transmission employing dual-band (C/L-band) distributed Raman amplification (DRA). The DRA improved OSNR and enabled an extra-long repeater spacing of 140 km.