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Measurement Concepts
48
Keysight
N4374B Lightwave Component Analyzer, User’s Guide
It is convenient to express the transducer functions
logarithmically in decibels. The system power gain from a Z
0
source to a Z
0
load can be defined using the above relationships:
The responsivities R
s
and R
r
need to be related to some value in
order to have meaning as individual quantities expressed
logarithmically, just as 0 dB represents an S
21
of unity or gain of
1.
Consequently source responsivity will be expressed in Watts per
Amp, which in decibels will be related to a conversion efficiency
of 1 W/A. Similarly, receiver conversion efficiency will be
relative to 1 A/W.
The individual responsivities can now be expressed individually
in decibels:
R
r
P
Δ
•
(
)
P
Δ
R
s
⁄
(
)
---------------------------
R
s
R
r
•
a
1
2
Power incident on the E/O converter
b
2
2
Power delivered to a Z0 load
S
21
2
b
2
2
a
1
2
-------------
R
s
R
r
•
2
System power gain
20log
10
S
21
System gain in dB
20log
10
R
s
R
r
•
20log
10
R
s
R
r
•
20log
10
R
s
W A
⁄
(
)
W A
⁄
----------------------------
R
r
A W
⁄
(
)
A W
⁄
----------------------------
•
R
s
dB
(
)
20log
10
R
s
W A
⁄
(
)
W A
⁄
----------------------------
Содержание N4374B
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