AI 中文总结
该研究针对相干转发器偏振态传感受终端噪声限制的问题，分析MedNautilus链路的琼斯矩阵时间序列，明确终端噪声对偏振旋转估计的影响，为相关传感应用提供了关键参考。
AI 中文摘要
采用相干转发器的偏振态传感技术可利用现有海底电缆实现广域地球物理监测，但其性能受光纤与终端硬件产生的偏振噪声限制。本研究探究终端噪声如何影响由接收机均衡器系数推导的偏振旋转估计值，以及该噪声如何掩盖传感所用的随机偏振漂移。我们分析了Sparkle地中海链路MedNautilus（约2000公里与450公里）中两个已部署接收机的琼斯矩阵时间序列，并将其与实验室背靠背参考进行对比。功率谱密度（PSD）分析显示存在低频随机游走机制与高频白噪声基底，二者由与链路相关的转角频率分隔。旋转创新方差随链路长度增加而增大，最长的现场链路还呈现出升高的白噪声，与累积的放大器和终端贡献相符。此外，还观测到谐波频谱分量，表明存在与转发器相关的伪影，需在实际传感应用中加以考虑。
英文摘要
State-of-Polarization sensing with coherent transponders enables wide-area geophysical monitoring over existing submarine cables, but its performance is limited by polarization noise from both the fiber and terminal hardware. This work investigates how terminal noise affects polarization rotation estimates derived from receiver equalizer coefficients and how it can obscure stochastic polarization drift used for sensing. We analyze Jones-matrix time series from two deployed receivers in the Sparkle Mediterranean link MedNautilus (approximately 2000 km and 450 km) and compare them with a laboratory back-to-back reference. Power Spectral Density (PSD) analysis reveals a low-frequency random-walk regime and a high-frequency white-noise floor, separated by a link-dependent corner frequency. The rotation innovation variance increases with link length, while the longest field link also shows elevated white noise consistent with accumulated amplifier and terminal contributions. Additionally, harmonic spectral components are observed, indicating a transponder-related artifact that should be considered in practical sensing applications.
CommentsAccepted for oral presentation at ICOP 2026
