Optical linewidth of soliton microcombs

Fuchuan Lei, Zhichao Ye, Óskar B. Helgason, Attila Fülöp, Marcello Girardi and Victor Torres-Company ()
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Fuchuan Lei: Chalmers University of Technology
Zhichao Ye: Chalmers University of Technology
Óskar B. Helgason: Chalmers University of Technology
Attila Fülöp: Chalmers University of Technology
Marcello Girardi: Chalmers University of Technology
Victor Torres-Company: Chalmers University of Technology

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Soliton microcombs provide a versatile platform for realizing fundamental studies and technological applications. To be utilized as frequency rulers for precision metrology, soliton microcombs must display broadband phase coherence, a parameter characterized by the optical phase or frequency noise of the comb lines and their corresponding optical linewidths. Here, we analyse the optical phase-noise dynamics in soliton microcombs generated in silicon nitride high-Q microresonators and show that, because of the Raman self-frequency shift or dispersive-wave recoil, the Lorentzian linewidth of some of the comb lines can, surprisingly, be narrower than that of the pump laser. This work elucidates information about the physical limits in phase coherence of soliton microcombs and illustrates a new strategy for the generation of spectrally coherent light on chip.

Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-30726-5

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DOI: 10.1038/s41467-022-30726-5

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