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2009
Book Article
Titel
Multi-span long-haul transmission
Abstract
This chapter outlines some current activities performed in the author's research group and aimed at identifying the performance and the distances attainable in optical multi-span long-haul transmission systems with high-order modulation. Firstly, some system experiments are presented which investigate achievable distances with 8PSK and Star 16QAM when using homodyne synchronous detection. In these experiments, system configurations with optical inline CD compensation as well as electrical CD compensation at the receiver are considered. Subsequently, the transmission lengths which have been achieved with different modulation formats are compared, showing that they are significantly reduced when migrating to higher-order formats. Finally, system degradation by the SPM-induced mean nonlinear phase shift in multi-span QAM transmission is highlighted and the efficiency of possible compensation schemes is shown.