Differential-driven Mach-Zehnder Modulators on Thin-film Lithium Niobate

Thin-film lithium niobate modulators have attracted substantial research attention in recent years, nevertheless, the majority employs the single-ended drive mode, which presents a challenge in terms of anti-interference capabilities. Therefore, we demonstrated a differential-driven Mach-Zehnder modulator on thin-film lithium niobate for the first time. And a modulation efficiency twice greater than single-ended driven mode is achieved by combining differential drive with push-pull drive utilizing the slow wave electrodes. The fabricated device exhibits a voltage-length product of 1.51 V•cm and a 3-dB bandwidth of over 40 GHz.