Polarization-independent grating coupler for micrometric silicon rib waveguides

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DOIResolve DOI: http://doi.org/10.1364/OL.37.003663
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TypeArticle
Journal titleOptics Letters
ISSN0146-9592
Volume37
Issue17
Pages36633665; # of pages: 3
SubjectCoupling 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
AbstractGrating 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.
Publication date
LanguageEnglish
AffiliationInformation and Communication Technologies; National Research Council Canada
Peer reviewedYes
NPARC number21270153
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Record identifier38b28ac8-c949-48f0-b90d-42b3f153c4f4
Record created2014-01-06
Record modified2016-05-09
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