Ultra compact Bragg grating devices with broadband selectivity
Abstract
Current silicon waveguide Bragg gratings typically introduce perturbation to the optical mode in the form of modulation of the waveguide width or cladding. However, since such a perturbation approach is limited to weak perturbations to avoid intolerable scattering loss and higher-order modal coupling, it is difficult to produce ultra-wide stopbands. In this Letter, we report an ultra-compact Bragg grating device with strong perturbations by etching nanoholes in the waveguide core to enable an ultra-large stopband with apodization achieved by proper location of the nanoholes. With this approach, a 15 µm long device can generate a stopband as wide as 110 nm that covers the entire C + L band with a 40 dB extinction ratio and over a 10 dB sidelobe suppression ratio (SSR). Similar structures can be further optimized to achieve higher SSR of > --> 17 d B for a stopband of about 80 nm.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 28, 2020
- Source ID
- 10.1364/ol.384688
Entities
People
- Ang Li
- Jordan Davis
- Yeshaiahu Fainman
Organizations
- ARPA-E
- ASML (United States)
- Army Research Office
- Defense Advanced Research Projects Agency
- National Science Foundation
- Office of Naval Research
- Semiconductor Research Corporation