Agilent Technologies 86038B User Manual page 38

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Figure 4 Sample PDL trace Top: for standard correction, Bottom: for
Option 400
c Check the GD curve. Since the normalization and
measurement are made with the same connection, the
relative GD should ideally be 0 ps and a measurement
curve should look similar to Fig. 5. The variation from a
linear fit to the data is a measure of the noise and
Agilent 86038B Photonic Dispersion and Loss Analyzer, Second Edition