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OTDR means Optical Time Domain Reflectometer
it usese the principal of Light scattering and reflection.It sends out a very high power pulse and measures the light coming back. At any point in time, the light the OTDR sees is the light scattered from the pulse passing through a region of the fiber. Think of the OTDR pulse as being a "virtual source" that is testing all the fiber between itself and the OTDR as it moves down the fiber. Since it is possible to calibrate the speed of the pulse as it passes down the fiber, the OTDR can correlate what it sees in backscattered light with an actual location in the fiber. Thus it can create a display of the amount of backscattered light at any point in the fiber,
Posted by adnanbuchh
An Optical Time Domain Reflectometer (OTDR)
www.wisegeek.com/what-is-an-otdr.htm
Posted by sagitraz
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