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Application Tutorials
Tutorial 4: Measure Laser Turn-on Delay
Tutorial 4: Measure Laser Turn-on Delay
On-screen markers can be used to measure both amplitude and time separa-
tion in eye-diagrams. The compatible modes for markers are eye, eyeline, and
pattern.
Change to Eyeline Mode
1 Change to eyeline mode, then turn filtering on by pressing:
INSTR PRESET, Setup, diagram, EYELINE, eyefltr ON OFF ON
,
BIT INTVL and enter 1
2 Set the persistence to infinite by pressing:
Traces, persist, INFINIT, Trg,Cal
3 After several traces have been displayed, press:
CONT STOP STOP
Turn on the markers
4 Press X1 and X2 to activate markers 1 and 2.
5 Turn the front-panel knob to move the markers to different transition crossing
points on the waveform as show in the following figure.
This provides an easy method to check the peak-to-peak difference in the laser
turn-on time measured at the crossing point. Notice in the following figure, a
delta reading of 30 ps is displayed at the top of the screen.