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Measurement Concepts
56
Using the above relationships, we can rewrite S
transducer responsivities R
b
2
S
=
----- -
21
a
1
I
2
=
-------- -
I
1
R
r
=
--------------------------
P
=
R
R
s
r
It is convenient to express the transducer functions
logarithmically in decibels. The system power gain from a Z
source to a Z
load can be defined using the above relationships:
0
2
a
=
Power incident on the E/O converter
1
Power delivered to a
b
2
S
=
------------
21
a
2
=
R
R
s
r
=
System power gain
20log
S
10
21
=
20log
10
Keysight N4373D Lightwave Component Analyzer, User's Guide
and R
:
s
r
P
R
s
2
2
2
1
=
System gain in dB
R
R
s
r
in terms of the
21
0
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