Sm. Webb et al., 337 KM UNREPEATERED TRANSMISSION AT 10 GBIT S WITH RAMAN AMPLIFICATION AND CLOCK PRECHIRP/, Electronics Letters, 32(9), 1996, pp. 827-828
10Gbit/s unrepeatered transmission is demonstrated over a symmetrical
337km mixed fibre system. NRZ data with clock prechirp enables a +22.2
dBm launch power to be utilised. A low noise receiver is realised with
a 980nm pumped preamplifier. Power budget improvement is obtained by
Raman gain in the system fibre and dispersion compensation at the rece
iver. System length is increased to 412km with the addition of remote
optically pumped post- and preamplifiers.