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7 measuring optical return loss, 7measuring optical return loss – EXFO FOT-930 Multifunction Loss Tester User Manual

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Multifunction Loss Tester

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7

Measuring Optical Return Loss

Optical return loss (ORL) is the total effect of multiple reflections and
scattering events within a fiber-optic system.

The FOT-930 Multifunction Loss Tester is equipped with an ORL meter to
measure ORL for singlemode fibers. The ORL meter uses the F

AS

T

ES

T SM

(singlemode) port only.

The following functions are available on your ORL meter:

ORL meter port

Open lists to change cable/fiber
name of next saved data.
Press Store to save current ORL
value under displayed name.

Measured ORL

(positive value)

Current ORL wavelength

Open list or press Wavelength
to switch between singlemode
wavelengths.

Press ORL Zero to calibrate
the ORL meter sensitivity.
Press Default ORL Zero to revert to
factory-default sensitivity.

Press ORL Reference to set reference

using ORL calibrated patchcord (best).

Press Loopback Ref. to use

any other patchcord.