Experimentally validated dispersion tailoring in a silicon strip waveguide with alumina thin-film coating

Kai Guo*, Jesper Bjerge Christensen, Xiaodong Shi, Erik Nicolai Christensen, Li Lin, Yunhong Ding, Haiyan Ou, Karsten Rottwitt

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

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We propose a silicon strip waveguide structure with alumina thin-film coating in-between the core and the cladding for group-velocity dispersion tailoring. By carefully designing the core dimension and the coating thickness, a spectrally-flattened near-zero anomalous group-velocity dispersion within the telecom spectral range is obtained, which is predicted to significantly broaden the bandwidth of four-wave mixing. We validate this by characterizing the wavelength conversion in a waveguide sample by atomic layer deposition technology, which to our best knowledge is the first experimental demonstration of the proposed structure. Due to the alumina thin-film coating, the wavelength conversion bandwidth reaches <formula><tex>$58\sim\mathrm{nm}$</tex></formula>, an increase by a factor of 1.3 compared to the corresponding structure without coating. This method can also be applied to other material platforms and applications requiring accurate group-velocity dispersion control.

Original languageEnglish
Article number6600508
JournalIEEE Photonics Journal
Issue number2
Number of pages9
Publication statusPublished - 6 Feb 2018


  • Bandwidth
  • Broadband communication
  • Coatings
  • Four-wave mixing
  • Optical waveguides
  • Optical wavelength conversion
  • Silicon
  • Silicon nanophotonics
  • Strips
  • Thin film coatings
  • Waveguide devices


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