本文介绍一种基于光时域反射技术的PMD测试新方法，可以保证网络运营商最大程度使用现有通信网络。

A new method with Optical Time Domain Reflectometry Technique for detecting PMD allows network operators to maximize the reuse of existing physical plant.

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同时，还讨论了影响光时域反射仪(OTDR)测试精度的要素和消除测试误差通常采用的对策。

At the same time, it discusses the elements influencing the test accuracy of optical time domain reflectometer (OTDR) and measures for eliminating test error.

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