Fluke OF-500 OptiFiber, Техническое справочное руководство

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OF-500 OptiFiber Certifying OTDR
Technical Reference Handbook
3-54
Table 3-7. Diagnosing Faults on OTDR Traces (cont.)
Small reflective event with high loss. May be identified as an end event though it occurs before the
end of the cabling.
May be caused by very sharp bend, a crack, or a mechanical splice with high loss. If the event is a
bend, it may show higher loss at a longer wavelength. Use a visual fault locator to verify the problem.
Bad mechanical splices should be reworked.
Large reflective event with gain (a “gainer”).
A connector between mismatched fibers (different backscatter coefficients, core sizes, numerical
apertures, or other parameters). This example shows a smaller core size (on the left) connected to a
larger core size. Testing from the other end would show a large reflective event with more loss than
a connector should have.