Implementing optical-frequency combs with integrated photonics will enable wider use of precision timing signals. Here, we explore the generation of an octave-span, Kerr-microresonator frequency comb using hybrid integration of an InP distributed-feedback laser and a SiN photonic-integrated circuit. We demonstrate electrically pumped and fiber-packaged prototype systems, enabled by self-injection locking. This direct integration of a laser and a microresonator circuit without previously used intervening elements, such as optical modulators and isolators, necessitates understanding self-injection-locking dynamics with octave-span Kerr solitons. In particular, system architectures must adjust to the strong coupling of microresonator backscattering and laser-microresonator frequency detuning that we uncover here. Our work illustrates critical considerations toward realizing a self-referenced frequency comb with integrated photonics.

中文翻译：

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倍频程梳齿的混合InP和SiN集成

用集成的光子技术实现光频率梳将使更精确的定时信号得到更广泛的使用。在这里，我们探讨了使用InP分布式反馈激光器和SiN光子集成电路的混合集成来产生倍频程的Kerr微谐振器频率梳。我们演示了通过自注入锁定实现的电泵和纤维包装原型系统。激光器和微谐振器电路的这种直接集成，而无需先前使用的中间元件（如光学调制器和隔离器），因此有必要了解跨度为八度的Kerr孤子的自注入锁定动力学。特别是，系统架构必须适应我们在这里发现的微谐振器反向散射和激光微谐振器频率失谐的强耦合。