Fiber Bragg gratings (FBGs) with various interrogation schemes to estimate the FBG’s spectrum shift have been widely used in fiber sensing systems. Wavelength swept laser (WSL) based interrogation architectures have been proposed to offer rapid and high-quality sensing performance. However, for getting higher sensing accuracy, the demands for high-performance WSL may push the system cost. Under these considerations, a WSL distribution architecture allowing multiple sensing processing units (SPUs) to share the WSL is studied in this Letter. A self-synchronization scheme is proposed to enable flexible SPU deployment with no concerns for the clock calibration. The proposed system is experimentally studied. Temperature estimation error of ${\sim}{2.5}^\circ {\rm{C}}$ and ${\sim}{0.5}^\circ {\rm{C}}$ with sensitivities of 0.13°C/ms and 0.14°C/ms, respectively, for the high and small temperature ranges are demonstrated.

中文翻译：

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具有波长扫描激光分布和自同步的光纤布拉格光栅传感系统

具有各种询问方案以估计FBG频谱偏移的光纤布拉格光栅（FBG）已广泛用于光纤传感系统中。已提出基于波长扫频激光器（WSL）的询问架构，以提供快速且高质量的感测性能。然而，为了获得更高的感测精度，对高性能WSL的需求可能会推高系统成本。基于这些考虑，本文研究了允许多个传感处理单元（SPU）共享WSL的WSL分发体系结构。提出了一种自同步方案，以实现灵活的SPU部署，而无需担心时钟校准。提出的系统进行了实验研究。$ {\ sim} {2.5} ^ \ circ {\ rm {C}} $和$ {\ sim} {0.5} ^ \ circ {\ rm {C}} $的温度估算误差 分别在高和小温度范围内的灵敏度分别为0.13°C / ms和0.14°C / ms。