[4] C. Calò et al. Hybrid InP-SiN microring-resonator based tunable laser with high output power and narrow linewidth for high capacity coherent systems(2022).
[8] A. L. Gaeta et al. Photonic-chip-based frequency combs. Nat. Photonics, 13, 158-169(2019).
[41] L. Maleki. The optoelectronic oscillator. Nat. Photonics, 5, 728-730(2011).