Cascaded optical communication systems with in-line semiconductor optical amplifiers Settembre, M. ; Matera, F. ; Hagele, V. ; Gabitov, N. ; Mattheus, A. W. ; Turitsyn, S. K. Abstract Publication: Journal of Lightwave Technology Pub Date: June 1997 DOI: 10.1109/50.588666 Bibcode: 1997JLwT...15..962S