Optical linewidth of soliton microcombs
Journal article, 2022

Understanding noise dynamics in frequency combs is crucial for applications. Here, the authors study the phase noise dynamics and the linewidth of soliton microcombs, revealing that some comb lines can be more quiet than the pump laser itself. 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.


Fuchuan Lei

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Zhichao Ye

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Òskar Bjarki Helgason

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Attila Fülöp

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Marcello Girardi

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Victor Torres Company

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Nature Communications

2041-1723 (ISSN) 20411723 (eISSN)

Vol. 13 1 3161

Integrerade optiska sändare för våglängdsmultiplexering i datacenternätverk

Swedish Research Council (VR) (2016-06077), 2017-01-01 -- 2022-12-31.

Dark-Soliton Engineering in Microresonator Frequency Combs (DarkComb)

European Commission (EC) (EC/H2020/771410), 2018-05-01 -- 2023-04-30.

Multidimensional coherent communications with microcombs

Swedish Research Council (VR) (2020-00453), 2020-12-01 -- 2026-11-30.

Noiseless phase-sensitive optical amplifiers and their applications

Swedish Research Council (VR) (2015-00535), 2016-01-01 -- 2025-12-31.

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Other Electrical Engineering, Electronic Engineering, Information Engineering





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