Setting Attenuation and/or Power Levels How to Use a Variable Optical Attenuator module
186 Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition
How to Set Attenuation
Before applying an attenuation factor, set the Attenuator module to
the appropriate wavelength.
8156xA modules Set the Attenuator module to the wavelength of the source. The
instrument applies the appropriate correction, derived from the
factory calibration, automatically compensating for the wavelength
dependence of the filter used in the Attenuator module.
8157xA modules The instrument utilizes a filter technology with a very low wavelength
dependence. Nevertheless, for the best possible accuracy:
• If the source is of a particular wavelength, set the Attenuator
module to that wavelength.
• If the source is a multi-wavelength DWDM signal, set the Attenuator
module to the weighted wavelength of the spectrum.
Figure 118 shows an attenuation factor α of 4.000 dB applied to a
1550nm source.
Figure 118 Attenuation factor set to 4.000 dB
To apply an attenuation factor:
1 Use the Cursor key to highlight the λ parameter, then press [Edit]
2 Use the Cursor key to enter the approriate wavelength, in nm.
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