@article {1659243,
	title = {Integrated Electro-Optic Isolator on Thin Film Lithium Niobate},
	journal = {Nature Photonics},
	year = {2023},
	abstract = {Optical isolator is an indispensable component of almost any optical system and is used to protect a laser from unwanted reflections for phase-stable coherent operation. The development of chip-scale optical systems, powered by semiconductor lasers integrated on the same chip, has resulted in a need for a fully integrated optical isolator. However, conventional approaches based on application of magneto-optic materials to break the reciprocity and provide required isolation have significant challenges in terms of material processing and insertion loss. As a result, many magnetic-free approaches have been explored, including acousto-optics, optical nonlinearity, and electro-optics. However, to date, the realization of an integrated isolator with low insertion loss, high isolation ratio, broad bandwidth, and low power consumption on a monolithic material platform is still absent. Here we realize non-reciprocal traveling-wave EO-based isolator on thin-film LN, enabling maximum optical isolation of 48 dB and an on-chip insertion loss of 0.5 dB using a single-frequency microwave drive at 21-dBm RF power. The isolation ratio is verified to be larger than 37 dB across a tunable optical wavelength range from 1510 to 1630 nm. We verify that our hybrid DFB laser - LN isolator module successfully protects the single-mode operation and the linewidth of the DFB laser from reflection. Our result is a significant step towards a practical high-performance optical isolator on chip.},
	url = {https://www-nature-com.ezp-prod1.hul.harvard.edu/articles/s41566-023-01227-8},
	author = {Mengjie Yu and Rebecca Cheng and Christian Reimer and Lingyan He and Kevin Luke and Puma, Eric and Shao, Linbo and Amirhassan Shams-Ansari and Hannah R. Grant and Leif Johansson and Zhang, Mian and Lon{\v c}ar, Marko}
}
