We generate a 100-Gb/s polarization-division-multiplexed 4-level pulse- amplitude-modulation signal with two directly modulated 1.5-µm single-mode VCSELs. Coherent detection and digital signal processing enable the transmission over 400-km standard single-mode-fiber (SSMF) within 20% overhead hard-decision forward-error-correction.

© 2014 OSA

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