Measurement Concepts
46
Keysight
N4375D Lightwave Component Analyzer, User’s Guide
EO measurements (lasers, modulators)
The measurement of an EO transducer is a combination of
input modulating current and output optical modulation
power. Slope responsivity is used to describe how a change
in input current produces a change in optical power.
Graphically this is shown in the figure below.
P
out
mW
I
in
mA
Responsivity R
s
W A
P
out
I
in
----------------
=
R
s
dB
20log
10
R
s
W A
W A
----------------------------
=
An LCA measures input modulating current and output
modulation power and displays the ratio of the two in
Watts/Amp, either linearly or in decibels.
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