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The displayed trace is a history of the modulation phase over the selected time
period (sweep time).
13 Press SCALE/REF, and enter a value in degrees that is equal to the fiber-optic
cable's index of refraction. For example, if the index of refraction is 1.45, enter
1.45°. Now, each vertical division corresponds to 1 mm of drift in the length of
the cable.
If you set the Scale/Div to 0.36 degrees, each vertical division corresponds to
1 ps of drift in the group delay.
14 You can save this setup, so it is available when making length stability
measurements in the future.
a Press SAVE and then SAVE REG#.
b Press SAVE and then TITLE REGISTER#.
c Enter a title and then press DONE and then RETURN.
d Press: SAVE your title.
15 To recall a previously stored setup:
a Press: RECALL and then RECALL your title.
b Adjust the vertical axis of the display, press: SCALE/REF and then SCALE/DIV or
REFERENCE VALUE or AUTOSCALE.
Operation
Checking Test Fiber Stability
2-37
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