Nature Communications, Published online: 10 June 2026; doi:10.1038/s41467-026-74265-9 High-performance chip-scale microcombs are vital for precision measurement and coherent communications, yet traditional self-injection locking is limited by thermo-refractive noise that creates a trade-off between repetition rate and linewidth. Here, authors propose a cascaded structure to separate comb generation and noise suppression, achieving ~70 dB noise reduction and a 100-GHz microcomb with all comb line