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Hybrid InP and SiN integration of an octave-spanning frequency comb
Published
Author(s)
Travis Briles, Su P. Yu, Lin Chang, Chao Xiang, Joel Guo, David Kinghorn, Gregory Moille, Kartik Srinivasan, John E. Bowers, Scott Papp
Abstract
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, like 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 back-scattering and laser-microresonator frequency detuning that we uncover here. Our work illustrates critical considerations towards realizing a self-referenced frequency comb with integrated photonics.
Briles, T.
, Yu, S.
, Chang, L.
, Xiang, C.
, Guo, J.
, Kinghorn, D.
, Moille, G.
, Srinivasan, K.
, Bowers, J.
and Papp, S.
(2021),
Hybrid InP and SiN integration of an octave-spanning frequency comb, Applied Physics Letters Photonics, [online], https://doi.org/10.1063/5.0035452, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=931568
(Accessed October 3, 2025)