Agilent Technologies HP E5574A, Руководство пользователя

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Taking Polarization Dependent Measurements
Measuring Polarization Dependent Loss
Averaged Insertion Loss
The Insertion Loss is defined as
You will notice a difference in readings for the insertion loss values
measured with the applications “Insertion Loss” or “PDL / Ins.
Loss” respectively.
The reason is that the average insertion loss measured with “PDL /
Ins. Loss” represents a PDL independent insertion loss value.
The value for Averaged Insertion Loss is the same as if measured
with an unpolarized source such as an LED.
IL
A/B
(dB) 10 –
P
A/B
P ref
-------------- log
⋅
=
IL
A/B
avg
IL
A/B
max IL
A/B
min +
2
--------------------------------------------------------- =
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