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Measuring flatness
You can use relative power measurements to measure flatness (pre-
emphasis) in a WDM system. Simply select one carrier as the reference
and measure the remaining carriers relative to the reference level. The
power differences represent the system flatness.
Press RESET to turn off the delta calculations so that all responses are
shown in absolute wavelength and powers.
To measure flatness
1 Press the front- panel Preset key.
2 Press List by Power.
This lists the input signals by power with the largest response listed
first.
3 Press the Delta On key.
4 Select ∆ PWR.
5 Use the
and
6 Press SELECT.
7 Since the largest power signal is the reference, the relative power
measurements for the other responses shows system flatness.
softkeys to select the first laser line.
Making Measurements
Measuring Laser Separation
2-21
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