Optical Backscatter Reflectometer 4600 5
User Guide
Frequency Domain Resolution
The duration of the impulse in the time domain determines the necessary step size
for the group delay
measurement.
If the step is too large,
information
about the device
is lost. If the step is too small, extraneous noise enters the measurement. Luna
Technologies’ OBR software allows the user to select precisely the correct step size
by setting the time domain window so that it includes only the device response. It
is also possible to obtain group delay data for a variety of step sizes by changing
the setting of the time domain window and recalculating the frequency domain data.
There is no need to perform a new measurement. This contrasts traditional methods
of group delay measurement, such as the modulation phase shift technique, where
the user must guess at the appropriate step size and perform a new measurement to
change that step size.
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