User`s guide

Definition of Terms Specifications
Agilent 81560A, 81561A, 81566A, & 81567A Optical Attenuator Modules, First Edition 31
Definition of Terms
This section defines terms that are used both in this chapter and
“Performance Tests” on page 39.
Generally, all specifications apply for the given environmental
conditions and after warmup time.
Measurement principles are indicated. Alternative measurement
principles of equal value are also acceptable.
Accuracy (Uncertainty)
The maximum possible difference (in dB) between attenuation setting
and actual attenuation. This specification is equivalent to the linearity
of attenuation
Conditions: Attenuator set to the wavelength of the source, constant
polarization state, constant temperature, excluding wavelengths of
water absorption lines. Other conditions as specified.
Measurement: With Fabry-Pérot type laser source of applicable
wavelength and optical power meter.
Attenuation
Difference (in dB) between total loss and total loss at 0 dB setting
(insertion loss).
attenuation
setting [dB]
difference between
att. setting. and act. att.
max. difference (positive)
0
max. difference (negative)
attenuation
uncertaint
y
0