40 Gbit/s soliton transmission over 400 km (57 km amplifier spacing) of installed lines without in-line control has been achieved. The maximum transmission penalties for parallel polarised and polarisation division multiplexed soliton transmission were ~4 and 1 dB, respectively. The transmission distance is the longest ever reported for a field trial with a single wavelength bit rate > 20 Gbit/s for any optical transmission format. The polarisation mode dispersion was numerically found to completely dominate the system performance.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el_19990039
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