Thin film lithium niobate (LN) is bringing renewed potential to the realm of integrated
photonics. Its strong quadratic and cubic nonlinearities as well as wide transparency window
are ideal for realizing on-chip self-referenced soliton microcombs. However, broadband Kerr
cavity soliton generation in LN thin films remains challenging due to limited dispersion
control and competition from strong stimulated Raman scattering (SRS). Here, we
demonstrate the generation of soliton microcombs in LN thin films featuring broad spectral …

This document provides supplementary information for the main manuscript titled"
Nearoctave lithium niobate soliton microcomb", which includes our experiment setup, device
characterization, the derivation of coupled mode equations with both Raman and Kerr
effects, the derivation of the intracavity pump mode threshold energy for the 1st SRS, and a
scheme for microcomb 2f− 3f self-referencing on LN thin film platform as well as discussion
on further broadening the soliton bandwidth. http://dx. doi. org/10.1364/optica. XX. XXXXXX