Colorless directional coupler with dispersion engineered sub-wavelength structure

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DOIResolve DOI: http://doi.org/10.1364/OE.20.013470
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TypeArticle
Journal titleOptics Express
ISSN1094-4087
Volume20
Issue12
Pages1347013477; # of pages: 8
Subject3D FDTD; Dispersive properties; Operation bandwidth; Phase response; Silicon-on-insulators; Sub-wave length grating; Sub-wavelength structures; Wavelength ranges; Diffraction gratings; Dispersion (waves); Optical waveguides; Three dimensional computer graphics; Directional couplers
AbstractDirectional couplers are extensively used devices in integrated optics, but suffer from limited operational wavelength range. Here we use, for the first time, the dispersive properties of sub-wavelength gratings to achieve a fivefold enhancement in the operation bandwidth of a silicon-oninsulator directional coupler. This approach does not compromise the size or the phase response of the device. The sub-wavelength grating based directional coupler we propose covers a 100nm bandwidth with an imbalance of =0.6dB between its outputs, as supported by full 3D FDTD simulations. © 2012 Optical Society of America.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Microstructural Sciences
Peer reviewedYes
NPARC number21269368
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Record identifier1d548ffc-1e82-458b-8efd-045dab7b0432
Record created2013-12-12
Record modified2016-05-09
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