There may be unreal peaks on backscattering signal curve in the measurement of optical fiber links by OTDR.

用OTDR测试光纤线路时，其背向瑞利散射信号曲线上常出现幻峰。

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The research results show that PMD deteriorates the performance of optical fiber links and becomes one of the main limiting factors.

分析表明：PMD造成光纤链路性能的严重恶化，成为限制其性能的最主要因素之一。

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Due to the Fresnel reflection in optical fiber links there will be dead zone existing in the measurement using OTDR. This paper gives a quantitative analysis of this so called dead zone.

光纤线路中的菲涅尔反射使OTDR测试有盲区，文章对该盲区进行了定量分析。

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This means more cell towers, more small cells, more Wi-Fi, more advanced technology like LTE and MIMO, more spectrum, and more Ethernet optical fiber links connecting all these wireless and data center nodes.

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