Agilent Technologies HP E5574A User Manual page 53

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Taking Polarization Dependent Measurements
Measuring the Polarization Dependent Characteristics of
Couplers
Polarization Dependent Splitting Ratio
PDSR = SR max – SR
A/B A/B
SR max = Out max / Out
A/B 1/2
SR min = Out min / Out
A/B 1/2
PDSR (%) = SR
A/B A/B
PDSR (dB) = – 10 log [SR
A/B
Note that PDSR (%) is not equal to PDSR
A
(dB) is equal to PDSR
B
Polarization Dependent Loss
PDL (dB) = 10 log [Out
A/B
Polarization Dependent Excess Loss
PDEL (dB) = EL max (dB) – EL min (dB)
EL max (dB) = – 10 log [(Out
EL min (dB) = – 10 log [(Out
PDEL (dB) = – 10 log [(Out
min)]
51
min
A/B
max
2/1
min
2/1
max (%) – SR min (%)
A/B
max / SR
A/B A/B
(%), while PDSR
B
(dB).
max / Out min]
1/2 1/2
max + Out
1 2
min + Out min) / P ref]
1 2
max + Out max)/(Out
1 2
min]
A
max) / P ref]
min + Out
1 2