Ultra-wideband, long distance WDM demonstrationof1 Tbit/s (50 × 20 Gbit/s), 600 km transmission using 1550 and 1580 nmwavelength bands

Abstract
Long-distance terabit wavelength division multiplexing transmission using two wavelength bands simultaneously is reported. 20 channels in the 1550 nm band and 30 channels in the 1580 nm band, all carrying 20 Gbit/s, are transmitted over 600 km of singlemode fibre.