An ultra-compact multimode interference coupler with a subwavelength grating slot

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DOIResolve DOI: http://doi.org/10.1002/lpor.201200106
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TypeArticle
Journal titleLaser and Photonics Reviews
ISSN1863-8880
Volume7
Issue2
PagesL12L15
SubjectFundamental building blocks; Multimode interference couplers; Photonic integrated circuits; Practical realizations; Silicon-on-insulator substrates; Silicon-on-insulators; Silicon-wire; Subwavelength grating; Fabrication; Light extinction; Photonic devices; Photonic integration technology; Integrated optics
AbstractMultimode interference couplers (MMIs) are fundamental building blocks in photonic integrated circuits. Here it is experimentally demonstrated, for the first time, a two-fold length reduction in an MMI coupler without any penalty on device performance. The design is based on a slotted 2 × 2 MMI fabricated on a commercial silicon-on-insulator (SOI) substrate. The slot is implemented with a subwavelength grating (SWG) comprising holes fully etched down to the oxide cladding, thereby allowing single etch step fabrication. The device has been designed using an in-house tool based on the Fourier Eigenmode Expansion Method. It has a footprint of only 3.5 μm x 23 μm and it exhibits a measured extinction ratio better than 15 dB within the full C-band (1530 nm-1570 nm). SWG engineered slots thus offer excellent perspectives for the practical realization of MMIs couplers with substantially reduced footprint yet with outstanding performance. Multimode interference couplers (MMIs) are fundamental building blocks in photonic integrated circuits. Here it is experimentally demonstrated, for the first time, a two-fold length reduction in an MMI coupler without any penalty on device performance. The design is based on a slotted 2 × 2 MMI fabricated on a commercial silicon-on-insulator (SOI) substrate. The slot is implemented with a subwavelength grating (SWG) comprising holes fully etched down to the oxide cladding, thereby allowing single etch step fabrication. The device has been designed using an in-house tool based on the Fourier Eigenmode Expansion Method. It has a footprint of only 3.5 μm x 23 μm and it exhibits a measured extinction ratio better than 15 dB within the full C-band (1530 nm-1570 nm). SWG engineered slots thus offer excellent perspectives for the practical realization of MMIs couplers with substantially reduced footprint yet with outstanding performance. © 2013 by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Publication date
LanguageEnglish
AffiliationInformation and Communication Technologies; National Research Council Canada
Peer reviewedYes
NPARC number21270655
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Record identifiera075e520-4991-4733-889c-a03a8ad1e0bb
Record created2014-02-17
Record modified2016-05-09
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