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<p>Passive optical networks (PONs) serve as the backbone of modern all-optical communication infrastructures, while fiber-optic distributed acoustic sensing (DAS) is being applied to various fields as a revolutionary technology. Here we present a study on seamless integration of PONs and DAS for human intrusion monitoring by designing an intensity time-varying frequency shift keying with subcarrier composite spectrum modulation (ITVFS-SCSM) scheme, allowing us to overcome the limitations imposed by the high transmission loss of optical splitters and the low extinction ratio of electro-optic modulators in PONs to the performances of DAS. The ITVFS-SCSM scheme designed can simultaneously realize communication and sensing functions with excellent component and modulation compatibilities within a single channel. Assisted by a time difference of arrival algorithm, the localization of human intrusion with sub-meter accuracy with a high DAS sensitivity of 36.5 pε Hz<sup>−1/2</sup> over 25.45 km fiber are achieved. This work represents a breakthrough in transforming PONs into distributed sensing networks that can accurately localize human intrusions with wide coverage, offering great potential to redefine next-generation PONs with both communication and security functions.</p>

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Seamless integration of distributed acoustic sensing and passive optical networks for human intrusion monitoring

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月8日

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  • Rong Tang,
  • Yunjiang Rao,
  • Huijuan Wu,
  • Yong Geng,
  • Qiang Jing,
  • Lang Xie,
  • Peng He,
  • Zhaoyu Li,
  • Shengtao Zou,
  • Tianyu Hua,
  • Sijin Zheng,
  • Yu Wu

摘要

Passive optical networks (PONs) serve as the backbone of modern all-optical communication infrastructures, while fiber-optic distributed acoustic sensing (DAS) is being applied to various fields as a revolutionary technology. Here we present a study on seamless integration of PONs and DAS for human intrusion monitoring by designing an intensity time-varying frequency shift keying with subcarrier composite spectrum modulation (ITVFS-SCSM) scheme, allowing us to overcome the limitations imposed by the high transmission loss of optical splitters and the low extinction ratio of electro-optic modulators in PONs to the performances of DAS. The ITVFS-SCSM scheme designed can simultaneously realize communication and sensing functions with excellent component and modulation compatibilities within a single channel. Assisted by a time difference of arrival algorithm, the localization of human intrusion with sub-meter accuracy with a high DAS sensitivity of 36.5 pε Hz−1/2 over 25.45 km fiber are achieved. This work represents a breakthrough in transforming PONs into distributed sensing networks that can accurately localize human intrusions with wide coverage, offering great potential to redefine next-generation PONs with both communication and security functions.