Abstract
In this paper the performance of FDM systems with a capacity of the order of a few hundreds of Gbit/s and a span up to 500 km is analysed by means of an analytical model. These systems can be important in the future high speed digital optical network. The comparison between IM-DD and coherend systems gives quite different results if transoceanic single channel systems or very high capacity FDM systems with a span of a few hundreds of km (300-500 km) are considered. While in the first case it is well known that IMDD exhibits better performance the situation is different in the second case. Coherent systems exhibit better performance: up to 300 Gbit/s can be transmitted over a distance of 500 km adopting homodyne PSK technique.
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