Polarization sensing of network health and seismic activity over a live terrestrial fiber-optic cable

Charles J. Carver, Xia Zhou
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Abstract

Wide-scale sensing of natural and human-made events is critical for protecting against environmental disasters and reducing the monetary losses associated with telecommunication service downtime. However, achieving dense sensing coverage is difficult, given the high deployment overhead of modern sensor networks. Here we offer an in-depth exploration of state-of-polarization sensing over fiber-optic networks using unmodified optical transceivers to establish a strong correlation with ground truth distributed acoustic sensing. To validate our sensing methodology, we collect 85 days of polarization and distributed acoustic sensing measurements along two colocated, 50 km fiber-optic cables in Southern California. We then examine how polarization sensing can improve network reliability by accurately modeling overall network health and preemptively detecting traffic loss. Finally, we explore the feasibility of wide-scale seismic monitoring with polarization sensing, showcasing the polarization perturbations following low-intensity earthquakes and the potential to more than double seismic monitoring coverage in Southern California alone. Carver and Zhou demonstrate the potential of state-of polarization sensing when applied to unmodified, terrestrial fiber-optic networks. This type of sensing is shown to detect events of both anthropic and seismic origin.

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通过实时陆地光缆对网络健康状况和地震活动进行偏振传感
对自然和人为事件进行大范围感知,对于防范环境灾害和减少电信服务停机造成的经济损失至关重要。然而,鉴于现代传感器网络的高部署开销,实现高密度传感覆盖十分困难。在此,我们利用未修改的光收发器对光纤网络上的极化传感状态进行了深入探讨,以建立与地面实况分布式声学传感的紧密联系。为了验证我们的传感方法,我们沿南加州两条 50 千米长的同轴光缆收集了 85 天的偏振和分布式声学传感测量数据。然后,我们研究了偏振传感如何通过准确模拟整体网络健康状况和预先检测流量损失来提高网络可靠性。最后,我们探讨了利用偏振传感进行大范围地震监测的可行性,展示了低强度地震后的偏振扰动,以及仅在南加州就能将地震监测覆盖范围扩大一倍以上的潜力。Carver 和 Zhou 展示了将状态偏振传感应用于未修改的陆地光纤网络的潜力。结果表明,这种传感方式可以探测到人为和地震引起的事件。
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