Journal
APL PHOTONICS
Volume 6, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/5.0035452
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Funding
- DARPA ACES program
- NIST
- DODOS program
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In this study, 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 is explored. The demonstration of electrically pumped and fiber-packaged prototype systems, enabled by self-injection locking, illustrates a step towards realizing a self-referenced frequency comb with integrated photonics. Understanding the self-injection-locking dynamics with octave-span Kerr solitons and adjusting system architectures to accommodate microresonator backscattering and laser-microresonator frequency detuning are key considerations for successful implementation.
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.
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