In Ftth Box , OTDR (Optical Time Domain Reflectometer) is an opto-electronic apparatus acclimated to characterize an optical fiber. OTDR is both the best accepted and atomic accepted fiber optic instrument.
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OTDR does not admeasurement loss, but instead implies it by searching at the backscatter signature of the fiber. It does not admeasurement cable bulb accident that can be activated to adeptness budgets.
An OTDR injects a alternation of optical pulses into the fiber beneath test. It aswell extracts, from the aforementioned end of the fiber, ablaze that is advertisement aback and reflected aback from credibility in the fiber breadth the base of refraction changes.
This alive assumption works like a alarm or sonar, sending out a beating of ablaze from a actual able laser, that is advertisement by the bottle in the bulk of the fiber. The acuteness of the acknowledgment pulses is abstinent and chip as a action of time, and is advised as a action of the fiber length.
An OTDR may be acclimated for ciphering the field assembly optical connector 's breadth and all-embracing attenuation, including braid and mated-connector losses. It may aswell be acclimated to locate faults, such as breaks.