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Integrated turnkey soliton microcombs

Shen, Boqiang and Chang, Lin and Liu, Junqiu and Wang, Heming and Yang, Qi-Fan and Xiang, Chao and Wang, Rui Ning and He, Jijun and Liu, Tianyi and Xie, Weiqiang and Guo, Joel and Kinghorn, David and Wu, Lue and Ji, Qing-Xin and Kippenberg, Tobias J. and Vahala, Kerry and Bowers, John E. (2020) Integrated turnkey soliton microcombs. Nature, 582 (7812). pp. 365-369. ISSN 0028-0836. doi:10.1038/s41586-020-2358-x.

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[img] PDF (contains theory and additional measurements, including Supplementary Figures S1–S4 and Supplementary References) - Supplemental Material
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[img] Image (JPEG) (Extended Data Fig. 1 Images and characteristics of microcomb resonators and pump lasers) - Supplemental Material
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[img] Video (QuickTime) (Supplementary Video 1 Conventional solitons are generated by sweeping the laser frequency) - Supplemental Material
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[img] Video (QuickTime) (Supplementary Video 2 Multiple solitons are generated via feedback locking) - Supplemental Material
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[img] Video (QuickTime) (Supplementary Video 3 A single soliton is generated via injection locking) - Supplemental Material
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Optical frequency combs have a wide range of applications in science and technology. An important development for miniature and integrated comb systems is the formation of dissipative Kerr solitons in coherently pumped high-quality-factor optical microresonators. Such soliton microcombs have been applied to spectroscopy, the search for exoplanets, optical frequency synthesis, time keeping and other areas. In addition, the recent integration of microresonators with lasers has revealed the viability of fully chip-based soliton microcombs. However, the operation of microcombs requires complex startup and feedback protocols that necessitate difficult-to-integrate optical and electrical components, and microcombs operating at rates that are compatible with electronic circuits—as is required in nearly all comb systems—have not yet been integrated with pump lasers because of their high power requirements. Here we experimentally demonstrate and theoretically describe a turnkey operation regime for soliton microcombs co-integrated with a pump laser. We show the appearance of an operating point at which solitons are immediately generated by turning the pump laser on, thereby eliminating the need for photonic and electronic control circuitry. These features are combined with high-quality-factor Si₃N₄ resonators to provide microcombs with repetition frequencies as low as 15 gigahertz that are fully integrated into an industry standard (butterfly) package, thereby offering compelling advantages for high-volume production.

Item Type:Article
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URLURL TypeDescription ReadCube access Paper ItemConference Paper
Shen, Boqiang0000-0003-0697-508X
Wang, Heming0000-0003-3861-0624
Yang, Qi-Fan0000-0002-7036-1712
Xiang, Chao0000-0002-7081-0346
Wang, Rui Ning0000-0002-2112-9108
Guo, Joel0000-0003-0203-5170
Wu, Lue0000-0002-7503-7057
Kippenberg, Tobias J.0000-0002-3408-886X
Vahala, Kerry0000-0003-1783-1380
Bowers, John E.0000-0003-4270-8296
Alternate Title:Integrated turnkey soliton microcombs operated at CMOS frequencies
Additional Information:© 2020 Springer Nature Limited. Received 22 November 2019. Accepted 23 March 2020. Published 17 June 2020. We thank G. Keeler, S. Papp, T. Briles, J. Norman and M. Tran for discussions, Y. Tong and S. Liu for assistance in characterizations, and Freedom Photonics for providing the lasers. The Si₃N₄ microresonators were fabricated at the EPFL Center of MicroNanoTechnology (CMi). This work is supported by the Defense Advanced Research Projects Agency (DARPA) under DODOS (HR0011-15-C-055) programmes of the Microsystems Technology Office (MTO). Data availability; The data that support the findings of this study are available from the corresponding authors upon reasonable request. Code availability: The code used in this study is available from the corresponding authors upon reasonable request. These authors contributed equally: Boqiang Shen, Lin Chang, Junqiu Liu, Heming Wang, Qi-Fan Yang. Author Contributions: B.S., L.C., Q.-F.Y., J.L., T.J.K., J.E.B. and K.V. conceived the experiment. D.K., L.C., B.S. and Q.-F.Y. packaged the chip. J.L., R.N.W., J.H. and T.L. designed, fabricated and tested the Si3N4 chip devices. H.W. constructed the theoretical model. Measurements were performed by B.S., L.C. and Q.-F.Y. with assistance from H.W., C.X., W.X., J.G., L.W. and Q.-X.J. All authors analysed the data and contributed to writing the manuscript. J.E.B., K.V. and T.J.K. supervised the project and the collaboration. The authors declare no competing interests.
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)HR0011-15-C-055
Issue or Number:7812
Record Number:CaltechAUTHORS:20191218-125534757
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Official Citation:Shen, B., Chang, L., Liu, J. et al. Integrated turnkey soliton microcombs. Nature 582, 365–369 (2020).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100351
Deposited By: Tony Diaz
Deposited On:18 Dec 2019 21:54
Last Modified:16 Nov 2021 17:53

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