期刊
OPTICS LETTERS
卷 45, 期 3, 页码 644-647出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.384688
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资金
- National Science Foundation [1707641, 1704085, 180789, 1640227, 190184]
- Office of Naval Research (MURI)
- Defense Advanced Research Projects Agency (MOABB, NLM)
- Semiconductor Research Corporation
- Army Research Office
- National Nanotechnology Coordinating Office [1542148]
- Cymer
- Advanced Research Projects Agency-Energy (LEED: A Lightwave Energy-Efficient Datacenter)
- Multidisciplinary University Research Initiative
- Direct For Computer & Info Scie & Enginr
- Division of Computing and Communication Foundations [1640227] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1707641] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1704085] Funding Source: National Science Foundation
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 mu m 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 dB for a stopband of about 80 nm. (C) 2020 Optical Society of America
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