| DOI | Resolve DOI: https://doi.org/10.1364/OL.37.003663 |
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| Author | Search for: Alonso-Ramos, C.; Search for: Zavargo-Peche, L.; Search for: Ortega-Moñux, A.; Search for: Halir, R.; Search for: Molina-Fernández, I.; Search for: Cheben, P.1ORCID identifier: https://orcid.org/0000-0003-4232-9130 |
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| Affiliation | - National Research Council of Canada. Information and Communication Technologies
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| Format | Text, Article |
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| Subject | coupling efficiency; directivity; dual-polarizations; duty cycles; fiber chip coupling; grating couplers; grating pitch; high reflectivity; oxide thickness; polarization dependence; polarization-independent; practical implementation; selective removal; Si substrates; silicon-on-insulator waveguide; silicon rib waveguides; waveguides; polarization |
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| Abstract | Grating couplers are a promising approach to implement efficient fiber-chip coupling. However, their strong polarization dependence makes dual-polarization operation challenging. In this Letter we propose, for the first time, a polarization-independent grating coupler for thick rib silicon-on-insulator (SOI) waveguides. Coupling efficiency is optimized by designing the grating pitch and duty cycle, without varying the bottom oxide thickness, which significantly simplifies practical implementation. Directivity of the grating coupler is enhanced by a high reflectivity layer under the bottom oxide after the selective removal of the Si substrate. Dual-polarization coupling efficiency of -2.8 dB is shown. |
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| Publication date | 2012-08-29 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21270153 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 38b28ac8-c949-48f0-b90d-42b3f153c4f4 |
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| Record created | 2014-01-06 |
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| Record modified | 2020-04-21 |
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