Design of fully apodized and perfectly vertical surface grating couplers using machine learning optimization

Mohsen Kamandar Dezfouli; Yuri Grinberg; Daniele Melati; Jens H. Schmid; Pavel Cheben; Siegfried Janz; Dan-Xia Xu

doi:10.1117/12.2576945

5 March 2021 Design of fully apodized and perfectly vertical surface grating couplers using machine learning optimization

Mohsen Kamandar Dezfouli, Yuri Grinberg, Daniele Melati, Jens H. Schmid, Pavel Cheben, Siegfried Janz, Dan-Xia Xu

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Proceedings Volume 11689, Integrated Optics: Devices, Materials, and Technologies XXV; 116890J (2021) https://doi.org/10.1117/12.2576945
Event: SPIE OPTO, 2021, Online Only

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.

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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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