10 Gb/s chirped duobinary transmission (CDBT) over 277 km of uncompensated standard single mode fibre

We have performed the first experimental demonstration of chirped duobinary transmission (CDBT). The enlarged transmission distance of this modulation format compared to conventional chirp-free duobinary transmission has only been shown by simulation previously. Thus we enlarge the maximum transmission distance of chirp-free duobinary transmission up to the new record distance of 277 km of standard single mode fibre without dispersion compensation.