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Compact broadband silicon 3 dB coupler based on shortcuts to adiabaticity

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Abstract

We proposed and experimentally demonstrated a compact, broadband, and low-loss-mode-evolution-based 2×23dB coupler on a silicon-on-insulator platform. The waveguide widths and separations of the coupler were tapered in an optimal manner using the shortcuts to the adiabaticity method. The coupler, with a 70μm total length and 200 nm feature size, exhibited <0.3dB measured excess loss over a broadband wavelength range from 1500 to 1600 nm. Balanced and unbalanced Mach–Zehnder interferometers fabricated for validation showed extinction ratios larger than 27 and 23 dB, respectively, over a 100 nm bandwidth. The extracted splitting ratio was between 0.48 and 0.52.

© 2018 Optical Society of America

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