Broadband polarization independent nanophotonic coupler for silicon waveguides with ultra-high efficiency

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DOIResolve DOI: http://doi.org/10.1364/OE.23.022553
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TypeArticle
Journal titleOptics Express
ISSN1094-4087
Volume23
Issue17
Pages2255322563; # of pages: 11
SubjectNanophotonics; Optical fibers; Optical waveguides; Photonic integration technology; Polarization; Refractive index; Silicon; Silicon on insulator technology; Single mode fibers; Waveguides; Cross sectional area; High-index contrast waveguides; Integrated optical circuit; Polarization independent; Silicon wire waveguides; Standard single mode fibers; Transverse electrics; Transverse magnetic polarization; Optical fiber coupling
AbstractCoupling of light to and from integrated optical circuits has been recognized as a major practical challenge since the early years of photonics. The coupling is particularly difficult for high index contrast waveguides such as silicon-on-insulator, since the cross-sectional area of silicon wire waveguides is more than two orders of magnitude smaller than that of a standard single-mode fiber. Here, we experimentally demonstrate unprecedented control over the light coupling between the optical fiber and silicon chip by constructing the nanophotonic coupler with ultra-high coupling efficiency simultaneously for both transverse electric and transverse magnetic polarizations. We specifically demonstrate a subwavelength refractive index engineered nanostructure to mitigate loss and wavelength resonances by suppressing diffraction effects, enabling a coupling efficiency over 92% (0.32 dB) and polarization independent operation for a broad spectral range exceeding 100 nm.
Publication date
PublisherThe Optical Society
LanguageEnglish
AffiliationNational Research Council Canada; Information and Communication Technologies
Peer reviewedYes
NPARC number21277341
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Record identifierf4f6a71b-320e-41c1-b61d-3cde3ab77cdf
Record created2016-03-09
Record modified2016-05-09
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