Journal
IEEE PHOTONICS JOURNAL
Volume 14, Issue 2, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2022.3160669
Keywords
Silicon; Waveguide lasers; Optical waveguides; Couplings; Laser modes; Photonics; Lasers; Integrated nanophotonic systems; silicon nanophotonics; theory and design; waveguides
Funding
- Research Innovation Fund for College Students of Beijing University of Posts and Telecommunications
- National Natural Science Foundation of China [61904016]
- National Key Research and Development Program of China [2018YFB2200104]
- Beijing Municipal Science and Technology Commission [Z191100004819012]
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A bi-layer 5-tip edge coupler is proposed in a multilayer silicon nitride-on-silicon waveguide platform, which achieves high coupling efficiency, broadband 1-dB drop bandwidth, and small footprint. Low-computation-cost electromagnetic numerical simulation and optimization strategies are applied to improve the reverse design of the complex couplers.
We propose a bi-layer 5-tip edge coupler in a multilayer silicon nitride-on-silicon (SiN-on-Si) waveguide platform. The coupler is used for the integration between a monolithic 1550 nm laser and a single-mode SiN waveguide. The simulated coupling efficiency is 92.8%. The vertical 1-dB-loss misalignment tolerance is as large as 0.5 mu m. Broad 1-dB-drop bandwidth (1338 nm to 1700 nm) and small footprint (total length: 38.2 mu m) are achieved simultaneously. A broadband bi-layer SiN-Si adiabatic transition cascaded to the edge coupler is designed to couple the laser power into a single-mode Si waveguide at an efficiency of 90.6%. Low-computation-cost electromagnetic numerical simulation and optimization strategies are applied to improve the reverse design of the complex couplers.
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