An octave-spanning mid-infrared frequency comb generated in a silicon nanophotonic wire waveguide

Bart Kuyken (), Takuro Ideguchi, Simon Holzner, Ming Yan, Theodor W. Hänsch, Joris Van Campenhout, Peter Verheyen, Stéphane Coen, Francois Leo, Roel Baets, Gunther Roelkens and Nathalie Picqué ()
Additional contact information
Bart Kuyken: Photonics Research Group, Ghent University–imec
Takuro Ideguchi: Max Planck Institut für Quantenoptik
Simon Holzner: Max Planck Institut für Quantenoptik
Ming Yan: Max Planck Institut für Quantenoptik
Theodor W. Hänsch: Max Planck Institut für Quantenoptik
Joris Van Campenhout: imec
Peter Verheyen: imec
Stéphane Coen: The University of Auckland
Francois Leo: Photonics Research Group, Ghent University–imec
Roel Baets: Photonics Research Group, Ghent University–imec
Gunther Roelkens: Photonics Research Group, Ghent University–imec
Nathalie Picqué: Max Planck Institut für Quantenoptik

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Laser frequency combs, sources with a spectrum consisting of hundred thousands evenly spaced narrow lines, have an exhilarating potential for new approaches to molecular spectroscopy and sensing in the mid-infrared region. The generation of such broadband coherent sources is presently under active exploration. Technical challenges have slowed down such developments. Identifying a versatile highly nonlinear medium for significantly broadening a mid-infrared comb spectrum remains challenging. Here we take a different approach to spectral broadening of mid-infrared frequency combs and investigate CMOS-compatible highly nonlinear dispersion-engineered silicon nanophotonic waveguides on a silicon-on-insulator chip. We record octave-spanning (1,500–3,300 nm) spectra with a coupled input pulse energy as low as 16 pJ. We demonstrate phase-coherent comb spectra broadened on a room-temperature-operating CMOS-compatible chip.

Date: 2015
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DOI: 10.1038/ncomms7310

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