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Measurement Concepts
E/O Measurements (Lasers, LED's)
32
The measurement of an E/O 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.
Agilent N4373A Lightwave Component Analyzer, First Edition
I
in
(
⁄
)
Responsivity R
W A
=
s
(
R
W A
s
(
)
----------------------------
R
dB
=
20log
s
10
W A
mA
∆P
out
--------------- -
∆
I
i n
⁄
)
⁄
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