Noda Kohei, Lee Heeyoung, Nakamura Kentaro, Mizuno Yosuke
Opt Express. 2021 Apr 26;29(9):13794-13805. doi: 10.1364/OE.422873.
We put forward a new theory on Brillouin optical correlation-domain reflectometry (BOCDR) based on arbitrary waveform modulation. We derive a universal representation for the spatial resolution using the foot convexity of the beat spectrum. This result well explains the previous results based on sinusoidal modulation, and thus our theory is the consistent extension of the conventional theory on BOCDR. This representation is also applicable to the spatial resolution evaluation of more complicated modulation schemes, such as the combined use of intensity and frequency modulations even with some phase delay. We also discuss what kinds of modulation waveforms should not be employed for distributed measurement to ensure high spatial resolution.
我们基于任意波形调制提出了一种关于布里渊光相关域反射测量法（BOCDR）的新理论。我们利用拍频光谱的足部凸性推导出了空间分辨率的通用表达式。该结果很好地解释了基于正弦调制的先前结果，因此我们的理论是传统BOCDR理论的一致扩展。这种表达式也适用于更复杂调制方案的空间分辨率评估，例如强度和频率调制的联合使用，甚至存在一些相位延迟的情况。我们还讨论了为确保高空间分辨率，分布式测量不应采用哪些调制波形。
