Microresonator-based soliton generation promises chip-scale integration of optical
frequency combs for applications spanning from time keeping to frequency synthesis.
Access to the soliton repetition rate is a prerequisite for those applications. While
miniaturized cavities harness Kerr nonlinearity and enable terahertz soliton repetition rates,
such high rates are not amenable to direct electronic detection. Here, we demonstrate hybrid
Kerr and electro-optic microcombs using a lithium niobate thin film that exhibits both Kerr …

This document provides supplementary information for the main manuscript titled" Monolithic
Kerr and electro-optic hybrid microcombs", which includes device design, device fabrication,
microring dispersion characterization, drop-port Kerr soliton spectrum, EO microcomb
simulation, EO microring DC tuning, and the frep, Kerr feedback control circuitry.