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Coherent supercontinuum generation in all-normal dispersion Si3N4 waveguides
RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology. Chalmers University of Technology, Sweden.ORCID iD: 0000-0001-8269-1033
Chalmers University of Technology, Sweden.
DTU Technical University of Denmark, Denmark.
Chalmers University of Technology, Sweden.
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2022 (English)In: Optics Express, E-ISSN 1094-4087, Vol. 30, no 6, p. 8641-8651Article in journal (Refereed) Published
Abstract [en]

Spectral broadening of optical frequency combs with high repetition rate is of significant interest in optical communications, radio-frequency photonics and spectroscopy. Silicon nitride waveguides (Si3N4) in the anomalous dispersion region have shown efficient supercontinuum generation spanning an octave-bandwidth. However, the broadening mechanism in this regime is usually attained with femtosecond pulses in order to maintain the coherence. Supercontinuum generation in the normal dispersion regime is more prone to longer (ps) pulses, but the implementation in normal dispersion silicon nitride waveguides is challenging as it possesses strong requirements in propagation length and losses. Here, we experimentally demonstrate the use of a Si3N4 waveguide to perform coherent spectral broadening using pulses in the picosecond regime with high repetition rate. Moreover, our work explores the formation of optical wave breaking using a higher energy pulse which enables the generation of a coherent octave spanning spectrum. These results offer a new prospect for coherent broadening using long duration pulses and replacing bulky optical components.

Place, publisher, year, edition, pages
The Optical Society , 2022. Vol. 30, no 6, p. 8641-8651
Keywords [en]
Dispersion (waves), Electric losses, Electromagnetic pulse, Optical communication, Pulse repetition rate, Silicon nitride, Waveguides, All-normal dispersions, Communication radios, High repetition rate, Optical frequency combs, Optical-frequency combs, Radio-frequency photonics, Radio-frequency spectroscopy, Silicon nitride waveguides, Spectral broadening, Supercontinuum generation
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URN: urn:nbn:se:ri:diva-58889DOI: 10.1364/OE.450987Scopus ID: 2-s2.0-85125874624OAI: oai:DiVA.org:ri-58889DiVA, id: diva2:1648358
Note

 Funding details: FID16- 0011, VR-2020-00453; Funding details: European Research Council, ERC, GA 771410; Funding text 1: European Research Council (GA 771410 DarkComb); Vetenskapsr?det (VR-2020-00453); Stiftelsen f?r Strategisk Forskning (FID16- 0011).

Available from: 2022-03-30 Created: 2022-03-30 Last updated: 2023-05-25Bibliographically approved

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Rebolledo-Salgado, IsraelZelan, Martin

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