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9 Test the optical fiber in Manual mode
9.1 Common Parameters for OTDR Testing.
You can set the parameters {Meas. Para.} from the [Options] section of the OTDR [Settings]
dialog. Please remember that these parameters and settings are only available if there is an
OTDR module connected to the TP-P6.
Parameter Definition
Range The overall distance of the fiber span
Pulsewidth
The width of the laser pulse being trasmitted by
the Light Source port of the OTDR module.
Averaging Time User-selectable testing time.
Wavelength
Laser wavelength, testing laser wavelength
selection
Mode
Defines which mode the OTDR is using, i.e.,
“Manual” , “Auto”, etc..
Table 9.1 OTDR common use parameters table
9.2 OTDR Test Parameters Configuration
Click the [ ] icon (from within the OTDR interface) to enter the settings window. From
here, testing parameters can be set by the user, including: General Settings, Analysis
Parameters Settings, etc.
Parameter Definition
IOR
IOR of optical fiber, which affects the transmission speed of a laser. Need to set
separately accord to operational wavelength relatively
Scatter Coefficient Also known as “back scatter,” affects the power of the laser on any given fiber span.
Non Reflection Threshold
Also known as “splice loss,” threshold. Non reflection events with insertion loss greater
than the threshold will be displayed on the trace.
Reflection Threshold
Also known as “reflectivity.” Reflection events with insertion loss greater than this
threshold will be displayed on the trace
End Threshold
Also known as optical fiber-end detecting threshold. The first event with insertion loss
greater than this threshold is identified as the end of the fiber, and all following events
will be ignored on trace.
Default Revert to the values set by the factory. This will erase all user-adjusted settings.
Table 9.2 OTDR test parameters setting table
“Manual” mode can be used to set various test parameters more precisely. if you are quite familiar with
the fiber being tested, setting the parameters precisely can achieve even greater testing accuracy.
Setting the parameters correctly is essential to achieving the most accurate results.