Optical frequency combs have a wide range of applications in science and technology 1 . An important development for miniature and integrated comb systems is the formation of dissipative Kerr solitons in coherently pumped high-quality-factor optical microresonators 2 – 9 . Such soliton microcombs 10 have been applied to spectroscopy 11 – 13 , the search for exoplanets 14 , 15 , optical frequency synthesis 16 , time keeping 17 and other areas 10 . In addition, the recent integration of microresonators with lasers has revealed the viability of fully chip-based soliton microcombs 18 , 19 . 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 Si 3 N 4 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. A turnkey regime for soliton microcombs is demonstrated, in which solitons are generated by switching on a co-integrated pump laser, eliminating the need for photonic and electronic control circuitry.

中文翻译：

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集成交钥匙孤子微梳

光频梳在科学技术领域有着广泛的应用 1．微型和集成梳状系统的一个重要发展是在相干泵浦高质量因子光学微谐振器 2-9 中形成耗散克尔孤子。这种孤子微梳 10 已应用于光谱学 11-13、寻找系外行星 14、15、光频合成 16、计时 17 和其他领域 10。此外，最近微谐振器与激光器的集成揭示了完全基于芯片的孤子微梳 18 、 19 的可行性。然而，微梳的操作需要复杂的启动和反馈协议，需要难以集成的光学和电子元件，和以与电子电路兼容的速率运行的微梳（几乎所有梳状系统都需要）由于其高功率要求尚未与泵浦激光器集成。在这里，我们通过实验证明并在理论上描述了孤子微梳与泵浦激光器共集成的交钥匙操作制度。我们展示了通过打开泵浦激光器立即产生孤子的工作点的出现，从而消除了对光子和电子控制电路的需要。这些特性与高品质因数的 Si 3 N 4 谐振器相结合，提供重复频率低至 15 GHz 的微梳，这些微梳完全集成到行业标准（蝶形）封装中，从而为大批量生产提供了引人注目的优势。