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  Low-loss broadband bi-layer edge couplers for visible light

Lin, Y., Mak, J. C. C., Chen, H., Mu, X., Stalmashonak, A., Jung, Y., et al. (2021). Low-loss broadband bi-layer edge couplers for visible light. Optics Express, 29(21), 34565-34576. doi:10.1364/OE.435669.

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oe-29-21-34565.pdf (Publisher version), 3MB
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2021
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Optical Society of America

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https://doi.org/10.1364/OE.435669 (Publisher version)
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 Creators:
Lin, Yiding1, Author              
Mak, Jason C. C.2, Author
Chen, Hong1, Author              
Mu, Xin1, Author              
Stalmashonak, Andrei1, Author              
Jung, Youngho1, Author              
Luo, Xianshu2, Author
Lo, Patrick G.-Q.2, Author
Sacher, Wesley D.1, Author              
Poon, Joyce K. S.1, Author              
Affiliations:
1Nanophotonics, Integration, and Neural Technology, Max Planck Institute of Microstructure Physics, Max Planck Society, ou_3287471              
2External Organizations, ou_persistent22              

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 Abstract: Low-loss broadband fiber-to-chip coupling is currently challenging for visible-light photonic-integrated circuits (PICs) that need both high confinement waveguides for high-density integration and a minimum feature size above foundry lithographical limit. Here, we demonstrate bi-layer silicon nitride (SiN) edge couplers that have ≤ 4 dB/facet coupling loss with the Nufern S405-XP fiber over a broad optical wavelength range from 445 to 640 nm. The design uses a thin layer of SiN to expand the mode at the facet and adiabatically transfers the input light into a high-confinement single-mode waveguide (150-nm thick) for routing, while keeping the minimum nominal lithographic feature size at 150 nm. The achieved fiber-to-chip coupling loss is about 3 to 5 dB lower than that of single-layer designs with the same waveguide confinement and minimum feature size limitation.

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 Dates: 2021-10-08
 Publication Status: Published online
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 Identifiers: DOI: 10.1364/OE.435669
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Title: Optics Express
  Abbreviation : Opt. Express
Source Genre: Journal
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Publ. Info: Washington, DC : Optical Society of America
Pages: - Volume / Issue: 29 (21) Sequence Number: - Start / End Page: 34565 - 34576 Identifier: ISSN: 1094-4087
CoNE: https://pure.mpg.de/cone/journals/resource/954925609918