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<p>With the exponential growth of artificial intelligence-driven data centre traffic, next-generation data centre optical interconnects must deliver high-speed data transmission while ensuring low latency and power consumption. Here, we present an ultra-simple low-latency self-homodyne coherent interconnect solution through anti-resonant hollow core fibre and leverages the Fermat number transform to implement the entire digital signal processing. The Fermat number transform eliminates the round-off errors prevalent in the fast Fourier transform through modulo operations and replaces computationally intensive multiplications with simple cyclic shift and addition operations. As a proof of concept, we demonstrate bidirectional transmission through a 5.1-km anti-resonant hollow core fibre, achieving a data rate of 448 Gb·s<sup>-1</sup>. Our proposed scheme reduces complexity of digital signal processing by 90%, whereas the integration of the anti-resonant hollow core fibre reduces the propagation latency by 28.4%. This work establishes a promising path to push the energy-efficiency boundary of coherent structure and enables large scale deployment of coherent optical interconnects.</p>

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Coherent optical interconnects using Fermat number transform and hollow core fibre

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年9月29日

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  • Siyu Chen,
  • Zheli Liu,
  • Can Zhao,
  • Mingming Zhang,
  • Peng Li,
  • Lei Zhang,
  • Jie Luo,
  • Zihe Hu,
  • Can Chen,
  • Xuchen Hua,
  • Xianqiao Liao,
  • Zhiyong Zhao,
  • Ming Tang

摘要

With the exponential growth of artificial intelligence-driven data centre traffic, next-generation data centre optical interconnects must deliver high-speed data transmission while ensuring low latency and power consumption. Here, we present an ultra-simple low-latency self-homodyne coherent interconnect solution through anti-resonant hollow core fibre and leverages the Fermat number transform to implement the entire digital signal processing. The Fermat number transform eliminates the round-off errors prevalent in the fast Fourier transform through modulo operations and replaces computationally intensive multiplications with simple cyclic shift and addition operations. As a proof of concept, we demonstrate bidirectional transmission through a 5.1-km anti-resonant hollow core fibre, achieving a data rate of 448 Gb·s-1. Our proposed scheme reduces complexity of digital signal processing by 90%, whereas the integration of the anti-resonant hollow core fibre reduces the propagation latency by 28.4%. This work establishes a promising path to push the energy-efficiency boundary of coherent structure and enables large scale deployment of coherent optical interconnects.