Abstract

Silicon nitride (SiN) waveguides provide a substantially lower index contrast, thermo-optic coefficient, and reduced birefringence compared to silicon-on-insulator waveguides. These properties make SiN a prominent candidate for implementation of ultra-wideband dual-polarization photonics circuits with a great potential for datacom applications. State-of-the-art SiN power splitters are still hampered in terms of either bandwidth or single-polarization operation. Here, we propose to overcome these limitations by exploiting modal and waveguide symmetry engineering in a single-mode slot waveguide. This topology prevents mode-beating, while granting symmetric power splitting for both polarizations. Experimental characterization of the fabricated device shows low loss ($ {\lt} {0.62}\,\,{\rm dB}$) and imbalance ($ {\lt} {0.6}\,\,{\rm dB}$) within an unprecedented bandwidth of 420 nm (1.26–1.68 µm).

© 2020 Optical Society of America

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