O-Band SOH Mach-Zehnder Modulator Operating at a PAM4 Line Rate of 384 Gbit/s with Sub-Volt Drive Voltage. - Adrian Schwarzenberger; Sidra Sarwar; Carsten Eschenbaum; Adrian Mertens; Malte Martens; Alexander Kotz; Dengyang Fang; Alban Sherifaj; Stefan Singer; Hend Kholeif; P. Kern; Peter Erk; et al. (OFC, 2024)