2-5
Application Tutorials
Tutorial 1: Measure Eye-Parameters
Example of a Large Overshoot Resulting from Laser Bias
Perform an Offset Calibration
This calibration procedure removes any offset that may be present in the opti-
cal-to-electrical converter. This is sometimes referred to as the "dark" level.
The offset calibration ensures accurate measurements of the laser’s one and
zero levels.
4Turn the laser off. (If you are measuring the pattern generator directly ,
disconnect the input signal at channel 1.)
5Perform the calibration by pressing:
Trg,Cal, OFFSET CAL, CONT
The calibration takes about a minute to execute. When the calibra t ion is fin-
ished, DC NULL: done is displayed.
6Turn the laser on. (If you are measuring the pattern generator directly ,
reconnect the input signal at channel 1.)
Measure Signal Parameters
7To include the rise time and fall time measurement in the displayed results,
press:
Measure, r/f tim ON OFF ON