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

Figure 4-5
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Testing Optical Couplers
Measuring Optical Coupler Characteristics

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:
Coupling Ratio
CR (%) = Out
A/B
CR (dB) = – 10 Log [Out
A/B
Splitting Ratio
SR (%) = Out
A/B
SR (dB) = – 10 Log [Out
A/B
Insertion Loss
IL (dB) = 10 log [Out
A/B
Excess Loss
EL (dB) = – 10 log [(Out
Directivity
DIR (dB) = – 10 log [In
A/B
72
1
2
/ (Out + Out )
1/2 1 2
/ (Out + Out
1/2 1
/ Out
1/2 2/1
/ Out ]
1/2 2/1
/ P ref]
1/2
+ Out ) / P ref]
1 2
/ P ref]
2
Out (Head A)
1
Out (Head B)
2
)]
2