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Tunable two-dimensional silicon grating coupler
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AI
DOI：10.1016/j.optlastec.2025.114131.png)
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Abstract
En 中文
As artificial intelligence (AI) systems scale, high-speed, energy-efficient optical communication becomes critical. Silicon photonics, particularly with dual-polarization techniques offers a promising solution, but balanced dual-polarization light coupling remains challenging. Here, we demonstrate the suspended, thermo-optically tunable two-dimensional grating coupler (2D-GC) fabricated using CMOS-compatible deep ultraviolet lithography. Integrating a thermally isolated structure, the device achieves dynamic 1-dB bandwidth over 59 nm, near-zero dynamic polarization-dependent loss (PDL) in a wavelength range of 1612 ± 14 nm, and dynamic wavelength tuning with minimal electrical power consumption. Localized heating allows active compensation of different polarization coupling to eliminate PDL. Our suspended tunable 2D-GC has a tuning efficiency of 0.75 nm/mW, seven times higher than non-isolated designs. Fully compatible with commercial fabrication processes, our design enables scalable, cost-effective deployment. By uniting broadband operation, low PDL, active tunability, and manufacturability, this work establishes a new benchmark for silicon photonic couplers, providing a practical path for energy-efficient, reconfigurable, polarization-balanced optical interconnects in next-generation AI systems.
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