Silicon-Organic Hybrid (SOH) Mach-Zehnder Modulator (MZM) for Single-Carrier IMDD Line Rates of 500 Gbit/s and Beyond

We demonstrate PAM4, PAM6, and PAM8 signaling using a $280 \mu \mathrm{~m}$-long SOH Mach-Zehnder modulator (MZM). We achieve PAM4 symbol rates of 204 GBd and PAM8 line rates of $528 \mathrm{Gbit} / \mathrm{s}$ ($412.5 \mathrm{Gbit} / \mathrm{s}$ net data rate) - record-high values for devices on the silicon photonic platform.