Abstract
In-line amplifier transmission using erbium-doped fiber amplifiers (EFDAs) is realized in 5-Gbit/s transoceanic systems in 1995-1996.1 In Japan, a 900-km in-line amplifier system with a data rate of 2.5 Gbit/s, upgradable to 10 Gbit/s, started service in May, 1995/ All of these systems use nonretum-to-zero (NRZ) signal formats. Solitons3,4 are one candidate for longdistance transmission. It is interesting to compare the choices for the next step in large-capacity long-distance systems.
© 1996 Optical Society of America
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