High-performance multimode interference coupler in silicon waveguides with subwavelength structures

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DOIResolve DOI: http://doi.org/10.1109/LPT.2011.2161866
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TypeArticle
Journal titleIEEE Photonics Technology Letters
ISSN1041-1135
Volume23
Issue19
Article number5953474
Pages14061408; # of pages: 3
SubjectCommon mode rejection ratio; Complex devices; Index contrasts; Multimode interference couplers; Phase error; Silicon waveguide; silicon wire waveguide; Silicon-on-insulators; Single etch; Sub-wavelength; Sub-wavelength structures; Subwavelength grating; Refractive index; Waveguide couplers; Waveguides; Integrated optics
AbstractThe performance of multimode interference (MMI) couplers in silicon waveguides is limited by the high lateral refractive index contrast. Here we propose the use of subwavelength gratings (SWGs) in the lateral cladding regions of the MMI to reduce the index contrast. Our approach significantly reduces the mode phase error while at the same time allowing a single etch step process. Using a $z$-periodic lateral SWG, we design a 2 × 4 MMI that operates as a 90° hybrid for a coherent optical receiver. This complex device exhibits a common mode rejection ratio (CMRR) and a phase error of less than-24 dBe and 2°, respectively, over the full C-band. Compared to MMI with a homogenous lateral cladding, using subwavelength refractive index engineering effectively extends the receiver bandwidth from 36 to 60 nm. © 2011 IEEE.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Microstructural Sciences
Peer reviewedYes
NPARC number21271504
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Record identifier511bd91e-b131-454f-9a5c-e1d71ab156fa
Record created2014-03-24
Record modified2016-05-09
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