How to Use a Variable Optical Attenuator module Setting Attenuation and/or Power Levels
Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition 197
How to Construct a
λ Offset Table
The procedures used to store the results of wavelength calibration
process using GP-IB commands are outlined in our Application Note
5988-3159EN : “Variable Optical Attenuator in BER Test Applications”.
For simplicity, the following manual procedure assumes your
reference powermeter is hosted by the same mainframe as the
Attenuator module, as described in “Hosting a Reference Powermeter”
on page 183.
For each wavelength of interest:
1 Set the source to the wavelength of interest.
2 Set the attenuator’s λ parameter to this wavelength.
3 Set the reference powermeter to this wavelength.
4 Press the [Menu] softkey.
5 Set <Offset (λ) > to <off >.
You cannot edit the λ Offset Table if the Offset (λ) function is on.
6 Press the [Table] softkey (or select the Menu item <Offset Table>)
7 Press the [Add] softkey.
– Enter the wavelength λ.
– Select <Offset>
– Press the [PM -> off] softkey.
– Select the channel used to host the reference powermeter.
– Press [OK] to confirm.
The difference between the power measured by the Attenuator
module’s integrated powermeter and that measured by the
reference powermeter is stored in the λ Offset Table as a
wavelength:Offset pair.
8 Press [OK] to store the result in the λ Offset Table.
9 Press [Close].
NOTE If your Attenuator module is not hosted by the same mainframe as
your reference powermeter you can, at step 7, enter the appropriate
Offset manually.
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