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5 March 2021 Design of fully apodized and perfectly vertical surface grating couplers using machine learning optimization
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Abstract
We present fully apodized and perfectly vertical surface grating couplers in 300 nm silicon waveguides. We achieve ultrahigh coupling efficiency of -0.35 dB at 1550 nm for an optical fiber with 10.4 µm mode-fiber-diameter. To this end, we followed a two stage process in which, we first optimized a pool of periodic grating couplers using machine learning techniques, and then apodized them over 100 parameters using the gradient based adjoint- method. Using a simple fabrication tolerance analysis, we also show that segment variations mostly causes a wavelength shift for the maximum coupling efficiency of the apodized grating couplers, similar to those typically observed for periodic grating couplers.
Conference Presentation
© (2021) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mohsen Kamandar Dezfouli, Yuri Grinberg, Daniele Melati, Jens H. Schmid, Pavel Cheben, Siegfried Janz, and Dan-Xia Xu "Design of fully apodized and perfectly vertical surface grating couplers using machine learning optimization", Proc. SPIE 11689, Integrated Optics: Devices, Materials, and Technologies XXV, 116890J (5 March 2021); https://doi.org/10.1117/12.2576945
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