529 km unrepeatered transmission at 2.488 GBit/susing dispersioncompensation, forward error correction, and remote post- andpre-amplifiers pumped by diode-pumped Raman lasers

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Abstract
Unrepeatered transmission is demonstrated over 501 km at 2.488 Gbit/s. Forward error correction enables a transmission distance of 529 km. A new SBS suppression technique, dispersion compensating fibre, and post- and pre-amplifiers remotely pumped by high power diode-pumped Raman lasers are employed.