10Gbit/s alternate polarisation solitontransmission over 300km step-index fibrelink with no in-line control

A straight-line in-field transmission was performed over a 300km step-index fibre link installed between Roma and Pomezia using a 1 OGbiUs stream of 1550nm alternate-polarisation solitons. Standard SDH 10Gbit/s line terminals were used at the transmitter and receiver sides. Error-free transmission was obtained with optical amplifiers placed every 5Okm and with no in-line soliton control. It is important to underline that in this case the large chromatic dispersion was compensated for by fibre non-linearity without resorting to chromatic dispersion compensators.