Real-time 200 Gb/s (4×56.25 Gb/s) PAM-4 transmission over 80 km SSMF using quantum-dot laser and silicon ring-modulator. - Nicklas Eiselt; Helmut Griesser; Michael Eiselt; Wilfried Kaiser; Saeid Aramideh; Juan Jose Vegas Olmos; Idelfonso Tafur Monroy; Jörg-Peter Elbers (OFC, 2017)