Agilent Technologies 86038B User Manual page 40

40
Figure 6 Sample DGD trace
6 Leaving the reference patch cord untouched, press Begin
Length. Since the normalization and measurement are made
with the same connection, the measured length value should
be within ±1 0.00002m.
7 For future reference and especially if there is a problem, save
the measurement by selecting Save from the File menu and
choosing a file name and directory.
8 Now disconnect the reference patch-cord from the 86038B
Optical Receiver input connector. Using the FC/FC adapter,
connect the free end of the reference patch-cord to the 2-m
mixed-fiber patch-cord, MXF. Then connect the free end of
the MXF patch-cord to the 86038B Optical Receiver input
connector. Make sure that the fiber position is stable by using
the Real-Time Monitor.
9 Then press the button Begin Measurement. This allows a
measurement with additional
a Check the DGD curve. The MXF patch-cord includes a
length of polarization maintaining fiber to provide a DGD
offset of about 0.15 ps. (This value is not calibrated for the
device under test.) Check to see that the average DGD
value lies between about 0.1 and 0.2 ps. Then use the
Curve Fit function with a linear fit to display the
Deviation values from the fit, as shown in Fig. 7. The
Agilent 86038B Photonic Dispersion and Loss Analyzer, Second Edition
CD and DGD.