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Separation of Stokes and anti-Stokes scattering in distributed Brillouin sensor through optical coherent orthogonal receiving

机译：通过光学相干正交接收分布式布里渊传感器分离斯托克斯和反斯托克斯散射

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摘要

In many distributed Brillouin fiber-optic sensing systems, Stokes and anti-Stokes scattering have to be separated. Conventionally, optical filtering is adopted for the separation and inevitably incurs loss of the scattering signal due to the close frequency spacing between Stokes and anti-Stokes scattering. In this paper, a new technique to separate Stokes and anti-Stokes scattering is proposed based on optical coherent orthogonal receiving. With optical coherent orthogonal receiving, phase information of optical field can be preserved at detection and hence Stokes and anti-Stokes scattering can be arranged in coherent addition or cancellation through phase arrangement to realize the separation. Theoretical analysis of the principle is presented with confirmation by experiment results. Moreover, the technique does not include temperature sensitive component and hence shows good stability and robustness.
机译：在许多分布式布里渊光纤传感系统中，斯托克斯和防斯托克斯散射必须分开。 传统上，由于斯托克斯和防风琴散射之间的近频间距，采用光学滤波，并且不可避免地引起散射信号的损失。 本文基于光学相干正交接收提出了一种分离斯托克斯和防斯托克斯散射的新技术。 利用光学相干正交接收，可以在检测中保留光场的相位信息，因此斯托克斯和防斯托克斯散射可以以相干的添加或通过相位布置来布置，以实现分离。 通过实验结果确认提出了原理的理论分析。 此外，该技术不包括温度敏感组分，因此显示出良好的稳定性和鲁棒性。

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