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

MPG-Autoren
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Lin,  Yiding
Nanophotonics, Integration, and Neural Technology, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Chen,  Hong
Nanophotonics, Integration, and Neural Technology, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Mu,  Xin
Nanophotonics, Integration, and Neural Technology, Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons265926

Stalmashonak,  Andrei
Nanophotonics, Integration, and Neural Technology, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Jung,  Youngho
Nanophotonics, Integration, and Neural Technology, Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons258003

Sacher,  Wesley D.
Nanophotonics, Integration, and Neural Technology, Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons257612

Poon,  Joyce K. S.       
Nanophotonics, Integration, and Neural Technology, Max Planck Institute of Microstructure Physics, Max Planck Society;

Externe Ressourcen

https://doi.org/10.1364/OE.435669
(Verlagsversion)

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oe-29-21-34565.pdf
(Verlagsversion), 3MB

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Zitation

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.


Zitierlink: https://hdl.handle.net/21.11116/0000-0009-5791-1
Zusammenfassung
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.