Polarization splitter and rotator with subwavelength grating for enhanced fabrication tolerance

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DOIResolve DOI: http://doi.org/10.1364/OL.39.006931
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TypeArticle
Journal titleOptics Letters
ISSN0146-9592
Volume39
Issue24
Pages69316934; # of pages: 4
SubjectOptical 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; Wavelength ranges; Wire wave guides
AbstractWe 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.
Publication date
PublisherOSA Publishing
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Microstructural Sciences
Peer reviewedYes
NPARC number21275613
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Record identifier09d531c2-747e-4c2e-b0a5-28d2dc8d86d4
Record created2015-07-14
Record modified2016-05-09
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