25 Gbaud/s 4-PAM (50 Gbit/s) modulation and 10 km SMF transmission with 1.3 ;C;m InGaAlAs-based DML

摘要

The first 25 Gbaud/s four-level pulse amplitude modulation (PAM) of a 1.3 μm directly modulated laser (DML) is achieved and a 10 km transmission over a single-mode fibre (SMF) with clear eye openings is demonstrated.