Explanation Of The Results; Connection Scheme For Optical Couplers - Agilent Technologies HP E5574A User Manual

Figure 2-7
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Taking Polarization Dependent Measurements
Measuring the Polarization Dependent Characteristics of
Couplers

Explanation of the Results

1
In (P ref)
1
2
In
2

Connection Scheme for Optical Couplers

If this is your setup, you have measured the following parameters:
Polarization Dependent Coupling Ratio
PDCR = CR
A/B
CR max = Out
A/B
CR min = Out
A/B
PDCR (%) = CR
A/B
Since you are measuring variations only, PDCR
PDCR (%).
B
PDCR (dB) = – 10 log [CR
A/B
Note that PDCR
50
1
2
max – CR min
A/B A/B
max / (Out max + Out
1/2 1
min / (Out min + Out
1/2 1
max (%) – CR
A/B A/B
max / CR
A/B
(dB) is not equal to PDCR
A
Out (Head A)
1
Out (Head B)
2
max)
2
min)
2
min (%)
(%) is equal to
A
min]
A/B
(dB).
B