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<p>Real-time spectrum sensing (RT-SS) is an essential technology for the upcoming sixth-generation (6G) networks, enabling dynamic spectrum management to support emerging integrated sensing and communication (ISAC) applications. However, conventional electronic and photonic RT-SS solutions face challenges in achieving ultrawide measurement range, compact size, and low latency, simultaneously. Here, we demonstrate an integrated photonic RT-SS system covering microwave to sub-terahertz bands on a thin-film lithium niobate (TFLN) platform. The TFLN chip integrates a broadband electro-optic (EO) modulator for signal loading, an EO microring filter bank for high-speed parallel frequency-to-time mapping, and an EO comb for channel referencing. The system achieves an analysis bandwidth of 57.5 GHz and measurable frequency up to 120 GHz, at a low latency of &#xa0;&lt;&#xa0;110 ns. The RT-SS system is further validated through a proof-of-concept ISAC demonstration, where a radar adaptively accesses underutilized spectral regions for high-quality ranging under dynamic communication interferences. Our work provides a compact solution for high-efficiency spectrum management in 6G ISAC networks.</p>

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Integrated photonic ultrawideband real-time spectrum sensing for 6G wireless networks

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月9日

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  • Yuansheng Tao,
  • Hanke Feng,
  • Yuan Fang,
  • Xiangzhi Xie,
  • Yuansong Zeng,
  • Yifan Wu,
  • Tong Ge,
  • Yiwen Zhang,
  • Zhaoxi Chen,
  • Zihan Tao,
  • Jie Xu,
  • Haowen Shu,
  • Xingjun Wang,
  • Xianghao Yu,
  • Cheng Wang

摘要

Real-time spectrum sensing (RT-SS) is an essential technology for the upcoming sixth-generation (6G) networks, enabling dynamic spectrum management to support emerging integrated sensing and communication (ISAC) applications. However, conventional electronic and photonic RT-SS solutions face challenges in achieving ultrawide measurement range, compact size, and low latency, simultaneously. Here, we demonstrate an integrated photonic RT-SS system covering microwave to sub-terahertz bands on a thin-film lithium niobate (TFLN) platform. The TFLN chip integrates a broadband electro-optic (EO) modulator for signal loading, an EO microring filter bank for high-speed parallel frequency-to-time mapping, and an EO comb for channel referencing. The system achieves an analysis bandwidth of 57.5 GHz and measurable frequency up to 120 GHz, at a low latency of  < 110 ns. The RT-SS system is further validated through a proof-of-concept ISAC demonstration, where a radar adaptively accesses underutilized spectral regions for high-quality ranging under dynamic communication interferences. Our work provides a compact solution for high-efficiency spectrum management in 6G ISAC networks.