Answers are grounded in this paper and cite their sources.
The authors have shown numerically, and confirmed experimentally, that reducing the bandwidth of the sequence spectrum (as opposed to the pulse spectrum), for instance using a duobinary coding, does not necessarily improve the propagation through dispersive fibres.
No takes yet. Share an insight, caveat, or question.
Penninckx et al. (1996) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: