| DOI | Resolve DOI: https://doi.org/10.1364/OL.39.006931 |
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| Author | Search for: Xiong, Yule1; Search for: Wangüemert-Pérez, J.Gonzalo; Search for: Xu, Dan-Xia1; Search for: Schmid, Jens H.1; Search for: Cheben, Pavel1ORCID identifier: https://orcid.org/0000-0003-4232-9130; Search for: Ye, Winnie N. |
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| Affiliation | - National Research Council of Canada. NRC Institute for Microstructural Sciences
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| Format | Text, Article |
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| Subject | optical waveguides; polarization; refractive index; silicon; silicon on insulator technology; waveguides; fabrication tolerances; polarization splitters; silicon wire waveguides; silicon-on-insulator platforms; subwavelength grating; waveguide widths; savelength ranges; wire wave guides |
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| Abstract | We propose a novel method to implement a compact and fabrication-tolerant polarization splitter and rotator (PSR) on the silicon-on-insulator platform. The PSR consists of a silicon wire waveguide coupled to a subwavelength grating (SWG) waveguide in an asymmetrical directional coupler. The SWG effect allows an additional degree of design freedom to engineer the equivalent material refractive index. This is advantageously used to effectively compensate for fabrication inaccuracies in PSRs. Our simulation results show that the PSR has a low TM-to-TE polarization conversion loss of -0.13 dB (a conversion efficiency of 97%) at the wavelength of 1550 nm, and better than -0.4 dB conversion loss over the entire C-band wavelength range. Compared to the PSRs made of conventional wire waveguides, the use of SWG index engineering improves the waveguide width fabrication tolerance substantially, from ±3 nm to ±40 nm. A compact device size with a coupling length of 25 μm is achieved. |
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| Publication date | 2014-12-12 |
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| Publisher | OSA Publishing |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21275613 |
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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 | 09d531c2-747e-4c2e-b0a5-28d2dc8d86d4 |
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| Record created | 2015-07-14 |
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| Record modified | 2020-04-22 |
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