Agilent Technologies HP E5574A User Manual page 47

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Taking Polarization Dependent Measurements
Measuring Polarization Dependent Loss
Averaged Insertion Loss
The Insertion Loss is defined as
IL (dB) = – 10
A/B
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.
IL
A/B
IL avg = ---------------------------------------------------------
A/B
The value for Averaged Insertion Loss is the same as if measured
with an unpolarized source such as an LED.
45
P
A/B
⋅
log ------------- -
P ref
max + IL min
A/B
2