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Analysis of Kerr comb generation in silicon microresonators under the influence of two-photon absorption and fast free-carrier dynamics

Trocha, P. 1; Gärtner, J. 2; Marin-Palomo, P. 1; Freude, W. 1; Reichel, W. 2; Koos, C. 1,3
1 Institut für Photonik und Quantenelektronik (IPQ), Karlsruher Institut für Technologie (KIT)
2 Institut für Analysis (IANA), Karlsruher Institut für Technologie (KIT)
3 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)


Kerr frequency comb generation relies on dedicated waveguide platforms that are optimized toward ultralow loss while offering comparatively limited functionality restricted to passive building blocks. In contrast to that, the silicon-photonic platform offers a highly developed portfolio of high-performance devices, but suffers from strong two-photon absorption (TPA) and subsequent free-carrier absorption (FCA) at near-infrared telecommunication wavelengths, thereby rendering Kerr comb generation a challenge. Here we present a model to investigate the impact of TPA and FCA on Kerr comb formation. Our model combines a modified version of the Lugiato-Lefever equation with a refined relation to precisely describe the fast space and time dependence of the free-carrier concentration along the circumference of the microresonator. Using this refined model, we derive conditions for modulation instability, in particular for necessary pump powers depending on TPA parameters and free-carrier lifetimes. We validate our analytical predictions by time integration and study the impact of fast free-carrier dynamics on Kerr comb formation. We find that silicon microresonators may be suitable for Kerr comb generation in the NIR, provided that the dwell time of the TPA-generated free carriers in the waveguide core is reduced by a reverse-biased p-i-n-junction and that the pump parameters are chosen appropriately.

Verlagsausgabe §
DOI: 10.5445/IR/1000135466
Veröffentlicht am 19.07.2021
DOI: 10.1103/PhysRevA.103.063515
Zitationen: 7
Zitationen: 5
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Analysis (IANA)
Institut für Mikrostrukturtechnik (IMT)
Institut für Photonik und Quantenelektronik (IPQ)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2469-9926, 2469-9934
KITopen-ID: 1000135466
HGF-Programm 43.32.03 (POF IV, LK 01) Designed Optical Devices & Systems
Erschienen in Physical review / A
Verlag American Physical Society (APS)
Band 103
Heft 6
Seiten Art.-Nr.: 063515
Vorab online veröffentlicht am 22.06.2021
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