IM-DD four-channel WDM transmission experiment over 1500 km employing 22 cascaded optical amplifiers

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Abstract
The authors demonstrate an over 1500 km transmission experiment employing WDM technique and optical amplifiers. Four 591.2 Mbit/s IM-DD channels were transmitted through 22 cascaded erbium-doped fibre optical amplifiers. The result shows the possibility of long distance multichannel optical communication systems.