The principle of OTDR (OpticalTimeDomainReflectometry) for faults location and application of OTDR method is discussed.
探讨了OTDR（光时域反射计）故障定位的原理，说明了OTDR的使用方法。
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This paper presents the principles of the Raman back-scattering effect based temperature sensing and the OTDR (OpticalTime-DomainReflectometry) based positioning.