Nikolay Ledentsov Jr., Christoph Kottke, Lukasz Chorchos, Vitaly A. Shchukin, Oleg Y. Makarov, M. Bou Sanayeh, Vladimir P. Kalosha, Volker Jungnickel, Ronald Freund, Jaroslaw P. Turkiewicz, Nikolay N. Ledentsov: Up to 600 Gbit/s data transmission over 100 m of single multi-mode fiber using 4×λ 850-940 nm VCSELs. OFC 2022: 1-3