@article {1623161,
	title = {High-efficiency and broadband on-chip electro-optic frequency combs generators},
	journal = {Nature Photonics},
	volume = {16},
	year = {2022},
	pages = {679},
	abstract = {Developments in integrated photonics have led to stable, compact and broadband comb generators that support a wide range of applications including communications1, ranging2, spectroscopy3, frequency metrology4, optical computing5,6\&nbsp;and quantum information7,8. Broadband optical frequency combs can be generated in electro-optical cavities, where light passes through a phase modulator multiple times while circulating in an optical resonator9,10,11,12. However, broadband electro-optic frequency combs are currently limited by low conversion efficiencies. Here we demonstrate an integrated electro-optic frequency comb with a conversion efficiency of 30\% and an optical span of 132 nm, based on a coupled-resonator platform on thin-film lithium niobate13. We further show that, enabled by the high efficiency, the device acts as an on-chip femtosecond pulse source (336 fs pulse duration), which is important for applications in nonlinear optics, sensing and computing. As an example, in the ultrafast and high-power regime, we demonstrate a frequency comb with simultaneous electro-optic and third-order nonlinearity effects. Our device paves the way for practical optical frequency comb generators and provides a platform to investigate new regimes of optical physics that simultaneously involve multiple nonlinearities.},
	url = {https://www.nature.com/articles/s41566-022-01059-y},
	author = {Yaowen Hu and Mengjie Yu and Brandon Buscaino and Neil Sinclair and Di Zhu and Rebecca Cheng and Amirhassan Shams-Ansari and Shao, Linbo and Zhang, Mian and Joseph M. Kahn and Loncar, Marko}
}
