50
Taking Polarization Dependent Measurements
Measuring the Polarization Dependent Characteristics of
Couplers
Explanation of the Results
If this is your setup, you have measured the following parameters:
Polarization Dependent Coupling Ratio
PDCR
A/B
= CR
A/B
max – CR
A/B
min
CR
A/B
max = Out
1/2
max / (Out
1
max + Out
2
max)
CR
A/B
min = Out
1/2
min / (Out
1
min + Out
2
min)
PDCR
A/B
(%) = CR
A/B
max (%) – CR
A/B
min (%)
Since you are measuring variations only, PDCR
A
(%) is equal to
PDCR
B
(%).
PDCR
A/B
(dB) = – 10 log [CR
A/B
max / CR
A/B
min]
Note that PDCR
A
(dB) is not equal to PDCR
B
(dB).
Figure 2-7
Connection Scheme for Optical Couplers
1
2
1
2
In
1
(P ref)
In
2
Out
1
(Head A)
Out
2
(Head B)
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