Jiang Jialin, Wang Zinan, Wang Zitan, Qiu Zijie, Liu Chunye, Rao Yunjiang
Opt Lett. 2021 Feb 1;46(3):685-688. doi: 10.1364/OL.415087.
This Letter proposes a novel phase-sensitive optical time domain reflectometry (-OTDR) with continuous chirped-wave (CCW), which can make full use of both time and frequency domain resources. The principle and benefits of CCW -OTDR are elaborated. With the merit of CCW -OTDR, 1.042 MHz sensing bandwidth and 5ε/ strain sensitivity are achieved along a 1013 m fiber with 4.4 m spatial resolution. To the best of the authors' knowledge, this is the first time that a -OTDR achieves megahertz sensing bandwidth with metric spatial resolution, and without limiting the frequency feature of the disturbance. The good performance in long-range sensing is also verified over a 49.7 km fiber. More than that, the digital domain flexibility of the proposed scheme can be used to optimize the measured acoustic signal according to its feature and the practical needs.
本文提出了一种采用连续啁啾波（CCW）的新型相敏光时域反射仪（-OTDR），它可以充分利用时域和频域资源。阐述了CCW -OTDR的原理和优点。基于CCW -OTDR的优点，在一根1013 m长的光纤上实现了1.042 MHz的传感带宽和5ε/的应变灵敏度，空间分辨率为4.4 m。据作者所知，这是首次实现具有米级空间分辨率且不限制干扰频率特性的-OTDR达到兆赫兹传感带宽。在一根49.7 km长的光纤上也验证了其在远程传感方面的良好性能。此外，所提方案在数字域的灵活性可用于根据测量的声学信号特征和实际需求对其进行优化。
