一种频分复用和偏振分集融合的Φ-OTDR系统

AnΦ-OTDR System Combining Frequency Division Multiplexing and Polarization Diversity Technology

提出了一种频分复用(FDM)和偏振分集接收(PDR)融合的Φ-OTDR结构,可以提升Φ-OTDR系统扰动信号无失真重构的能力。期望利用这种融合技术,有效实现对干涉衰落和偏振衰落的同时抑制。通过验证性实验,将10 s数据的重构信号平均失真率由15.55%降低至1.10%。对比单独使用FDM技术抑制干涉衰落和单独使用PDR技术抑制偏振衰落,具有更好的衰落噪声抑制效果。为Φ-OTDR系统的工程推广提供了一种有效的抗衰落噪声方式。

In order to improve the ability of distortion-free reconstruction of the disturbance signal of theΦ-OTDR system,aΦ-OTDR structure was proposed to combine frequency division multiplexing(FDM)and polarization diversity reception(PDR).It was expected that the use of this fusion technology could effectively achieve simultaneous suppression of interference fading and polarization fading.Through a confirmatory experiment,the average distortion rate of the reconstructed signal of the 10 s data was reduced from 15.55%to 1.10%.Compared with using FDM technology alone to suppress interference fading and using PDR technology alone to suppress polarization fading,it had better fading noise suppression effect,which could provide an effective anti-fading noise method for the engineering promotion of theΦ-OTDR system.