In the past few years, Brillouin-based optical fiber sensors have gained significant ground for distributed temperature and strain measurements in the real world. Among these sensors, the optical chirp chain (OCC) based Brillouin optical fiber sensor is a good candidate to realize ultrafast distributed sensing, which is of great importance to distinguish quick-changing events in practical applications. In this paper, the concept, principle and sensing scheme of OCC are introduced, including the OCC Brillouin optical time-domain analysis and OCC Brillouin optical time-domain reflectometry. In OCC Brillouin optical time-domain analysis, the influence of transient interaction is reflected as three types of spectral distortions, i.e., the back end distortion, the frequency lag of main peak and the frequency saltation distortion, which are verified in the simulation and experiment and attributed to the rapid frequency sweeping. In addition, this paper reviews the OCC based cutting-edge schemes and technologies aspects to upgrade Brillouin sensors with ultra-fast and high-performance sensing capability. In the future, there are still many challenges in OCC based distributed sensing, such as high spatial resolution, real-time demodulation and low-cost scheme.

中文翻译：

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基于光学线性调频链的超快分布式布里渊光纤传感

在过去的几年中，基于布里渊的光纤传感器在现实世界中的分布式温度和应变测量中赢得了重要的基础。在这些传感器中，基于光学chi链（OCC）的布里渊光纤传感器是实现超快速分布式传感的良好选择，这对于区分实际应用中的快速变化事件至关重要。介绍了OCC的概念，原理和传感方案，包括OCC布里渊光学时域分析和OCC布里渊光学时域反射仪。在OCC Brillouin光学时域分析中，瞬态相互作用的影响反映为三种光谱失真，即后端失真，主峰的频率滞后和频率盐化失真，在仿真和实验中进行了验证，并归因于快速扫频。此外，本文回顾了基于OCC的尖端方案和技术方面，以升级具有超快和高性能传感能力的布里渊传感器。未来，基于OCC的分布式传感仍然存在许多挑战，例如高空间分辨率，实时解调和低成本方案。