Abstract
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 language | English |
|---|---|
| Article number | 6600508 |
| Journal | IEEE Photonics Journal |
| Volume | 10 |
| Issue number | 2 |
| Number of pages | 9 |
| ISSN | 1943-0655 |
| DOIs | |
| Publication status | Published - 6 Feb 2018 |
Keywords
- Bandwidth
- Broadband communication
- Coatings
- Four-wave mixing
- Optical waveguides
- Optical wavelength conversion
- Silicon
- Silicon nanophotonics
- Strips
- Thin film coatings
- Waveguide devices