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Implementation methods of repetitive sampling on an OTDR for alignment of ghost reflection in short-period measurement with a short-length fiber

机译:在OTDR上重复采样以实现短时光纤短距离测量中的重影反射的实现方法

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This paper discusses implementations of a repetitive sampling measurement for OTDR considering ghost effect for short period measurement with a short-length fiber. Repetitive sampling is done to acquire higher equivalent sampling rate with a low sampling clock in the data acquisition. However, the repetitive sampling can cause misalignment of ghost reflection which produces a distortion. This study analyzes the effect of ghost on the repetitive sampling measurement result. The implementations which can be categorized based on the delay object, delaying sequence, and delay looping steps are analyzed for the distortion possibility and proposed to avoid a mis-aligned ghost reflection measurement. The experiment with an OTDR that has an equivalent sampling rate of 10 GHz obtained using a 10 MHz sampling clock and 100 ps delay is shown to validate the method.
机译:本文讨论了针对短距离光纤短周期测量中考虑重影效应的OTDR重复采样测量的实现。进行重复采样以在数据采集中以较低的采样时钟获得较高的等效采样率。但是,重复采样会导致重影反射未对准,从而产生失真。本研究分析了重影对重复采样测量结果的影响。可以基于延迟对象,延迟序列和延迟循环步骤对实现进行分类,以分析其失真可能性,并提出避免失准的幻影反射测量的建议。通过使用10 MHz采样时钟和100 ps延迟获得的OTDR等效采样率为10 GHz的实验,证明了该方法的有效性。

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