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<p>The rapid growth of artificial-intelligence computing demands high-bandwidth and energy-efficient data-center interconnects. Although self-homodyne coherent (SHC) transmission reduces digital signal-processing complexity, its practical deployment is limited by ultrafast state-of-polarization (SOP) fluctuations that destabilize coherent reception. Here we show an ultrafast adaptive polarization controller (APC) based on thin-film lithium tantalate, enabled by the co-design of a photonic chip, a finite-boundary gradient-descent (FBGD) algorithm, and a low-latency real-time control system. The FBGD algorithm incorporates the finite phase boundary directly into the control strategy, enabling reset-free continuous SOP tracking. The implemented APC is validated through both standalone polarization-tracking measurements and a dual-polarization 16-QAM SHC 400-Gbps transmission system. Stable reset-free operation under continuous polarization disturbances is maintained up to 1 Mrad·s⁻¹. These results establish a previously inaccessible operating regime for integrated polarization control and provide a practical route toward ultrafast and reset-free polarization control in coherent optical interconnects and other polarization-sensitive photonic systems.</p>

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Ultrafast reset-free integrated polarization tracking enabled by thin-film lithium tantalate

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月17日

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  • Zichao Gao,
  • Siyu Lu,
  • Mingming Zhang,
  • Gengqi Yao,
  • Chicheng Zhang,
  • Miao Deng,
  • Siyu Chen,
  • Yiqi Dai,
  • Shiqi Yue,
  • Chijun Li,
  • Yuqi Li,
  • Ziwen Zhou,
  • Zheli Liu,
  • Xinyang Yu,
  • Xitao Ji,
  • Cheng Zeng,
  • Siqi Yan,
  • Jinsong Xia,
  • Ming Tang

摘要

The rapid growth of artificial-intelligence computing demands high-bandwidth and energy-efficient data-center interconnects. Although self-homodyne coherent (SHC) transmission reduces digital signal-processing complexity, its practical deployment is limited by ultrafast state-of-polarization (SOP) fluctuations that destabilize coherent reception. Here we show an ultrafast adaptive polarization controller (APC) based on thin-film lithium tantalate, enabled by the co-design of a photonic chip, a finite-boundary gradient-descent (FBGD) algorithm, and a low-latency real-time control system. The FBGD algorithm incorporates the finite phase boundary directly into the control strategy, enabling reset-free continuous SOP tracking. The implemented APC is validated through both standalone polarization-tracking measurements and a dual-polarization 16-QAM SHC 400-Gbps transmission system. Stable reset-free operation under continuous polarization disturbances is maintained up to 1 Mrad·s⁻¹. These results establish a previously inaccessible operating regime for integrated polarization control and provide a practical route toward ultrafast and reset-free polarization control in coherent optical interconnects and other polarization-sensitive photonic systems.