Agilent Technologies 86122A User Manual page 84

Using the 86122A
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Laser Channel Separation
It is often important to measure the wavelength and power separation
between multiple laser lines. This is especially true in wavelength-division-
multiplexed (WDM) systems where channel spacing must be adhered to.
The Agilent 86122A can display the wavelength and amplitude of any laser
line relative to another.
1 Press and click
2 Select a channel as the reference by clicking in the "Ref" column of the desired
row.
3 To determine channel spacing from the reference, simply read the relative
wavelength values in the "Delta WL" column.
Laser Channel 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.
1 Press and click
2 Select the channel with the largest amplitude as the reference by clicking in the
"Ref" column of that peak's row.
3 To determine channel flatness from the reference, simply read the relative power
values in the "Delta Pwr" column.
Laser Channel Separation/Flatness
You can also measure channel separation and flatness at the same time.
Press and click
Laser Drift
Laser drift can be easily measured by using the drift application.
Press and click
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Agilent 86122A Multi-Wavelength Meter, Second Edition
Making Measurements