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arXiv · 2301.00816

Thermo-optic phase shifter based on hydrogen-doped indium oxide microheater

Weiyu Tong·Erqi Yang·Yu Pang·Haobo Yang·Xin Qian·Ronggui Yang·Bin Hu·Jianji Dong·Xinliang Zhang
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Abstract

Thermo-optic (TO) phase shifters are very fundamental units in large-scale active silicon photonic integrated circuits (PICs). However, due to the limitation of microheater materials with a trade-off between heating efficiency and absorption loss, designs reported so far typically suffer from slow response time, high power consumption, low yields, and so on. Here, we demonstrate an energy-efficient, fast-response, and low-loss TO phase shifter by introducing hydrogen-doped indium oxide (IHO) films as microheater, and the optimized electron concentration with enhanced mobility endows the IHO high conductivity as well as high near-infrared (NIR) transparency, which allow it to directly contact the silicon waveguide without any insulating layer for efficient tuning and fast response. The TO phase shifter achieves a sub-microsecond response time (970 ns/980 ns) with a {\pi} phase shift power consumption of 9.6 mW. And the insertion loss introduced by the IHO microheater is ~ 0.5 dB. The proposed IHO-based microheaters with compatible processing technology illustrate the great potential of such material in the application of large-scale silicon PICs.

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Weiyu Tong, Erqi Yang, Yu Pang, Haobo Yang, Xin Qian, Ronggui Yang, Bin Hu, Jianji Dong, Xinliang Zhang. 2023-01-02. Thermo-optic phase shifter based on hydrogen-doped indium oxide microheater. https://arxiv.org/abs/2301.00816

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