Brillouin optical correlation-domain reflectometry (BOCDR) generally suffers from the trade-off relationship between the spatial resolution and the measurement range. In this work, we perform a proof-of-concept demonstration of a chirp modulation scheme to extend the measurement range of BOCDR. In this scheme, optical frequency is modulated using a chirp-shaped waveform. We show that, although the spatial resolution is slightly deteriorated, the measurement range and the range-to-resolution ratio can be relatively largely improved. In our preliminary experiment, the range-to-resolution ratio is 471, which is approximately 3 times higher than that of a standard configuration, proving the effectiveness of this scheme.

中文翻译：

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基于线性调频调制方案的布里渊光学相关域反射仪的测量范围扩大

布里渊光学相关域反射法（BOCDR）通常受空间分辨率和测量范围之间权衡关系的困扰。在这项工作中，我们进行了线性调频调制方案的概念验证，以扩展BOCDR的测量范围。在该方案中，使用线性调频波形调制光频率。我们显示，尽管空间分辨率略有下降，但可以相对较大地提高测量范围和范围分辨率。在我们的初步实验中，范围分辨率为471，大约是标准配置的3倍，证明了该方案的有效性。