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Measurement Concepts
EO measurements (lasers, modulators)
52
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
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.
Keysight N4373D Lightwave Component Analyzer, User's Guide
I
in
=
Responsivity R
W A
s
R
W A
s
R
dB
=
20log
----------------------------
s
10
W A
mA
P
out
--------------- - -
I
in
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