Publication: Numerical Optimization of Grating Coupler Parameters for InP-based Photonic Circuits
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2019
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© 2019 IEEE.We have performed 2D finite-difference time-domain (FDTD) simulations of fiber to chip coupling. The experimental semiconductor structure of the waveguide based on In-GaAsP /InGaAIAs compounds was used in the calculations. This structure is intended for use in electro-optical modulators constructed according to the Mach-Zehnder scheme. Our numerical calculations showed that a simple uniform grating couplers have extremely low coupling efficiency of about 5% for InP-based waveguides. We performed a global optimization of the grating coupler parameters such as etch depth, thickness, period, angle of the grating in relation to the waveguide, etc. We demonstrated a maximal coupling efficiency of about 60% which can be further increased by optimizing a number of other parameters.
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Grishakov, K. S. Numerical Optimization of Grating Coupler Parameters for InP-based Photonic Circuits / Grishakov, K.S., Kargin, N.I. // Progress in Electromagnetics Research Symposium. - 2019. - 2019-June. - P. 721-724. - 10.1109/PIERS-Spring46901.2019.9017264
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https://www.doi.org/10.1109/PIERS-Spring46901.2019.9017264
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https://openrepository.mephi.ru/handle/123456789/19478