40 Gbit/s (16 × 2.5 Gbit/s) unrepeatered transmissionover 427 km

Abstract
Unrepeatered transmission at 40 Gbit/s (16 × 2.5 Gbit/s) is demonstrated over 427 km of non-dispersion shifted fibre, with remote amplification, dispersion compensation and forward error correction. The transmission distance is extended to 450 km at 20 (8 × 2.5) and 475 km at 10 Gbit/s (4 × 2.5 Gbit/s).