Exfo OTDR 2 Manuel d'utilisateur télécharger pdf (Page 100)

Analyzing the Results Manually

92 OTDR

Getting Optical Return Loss (ORL)

The ORL calculation will provide the following information:

 the ORL between markers A and B

 the total ORL is calculated either between the span start and the span

end, or on the total fiber span, depending on the option you have

selected. For more information, see Excluding and Including Span Start

and Span End on page 28.

Optical return loss (ORL) refers to the total effect of multiple reflections

and scattering events within a fiber-optic system.

To get the ORL value:

1. From the main window, select the Measure tab.

2. At the bottom of the window, tap ORL. Markers A and B appear on the

graph.

3. Position markers A and B to delimit the area for which you want to

know the ORL value.

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Exfo OTDR 2 Manuel d'utilisateur Page 100