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Measurement Concepts
General Measurement Techniques and Considerations
50
The concept of lightwave component analysis is straightforward.
Measurements are made of the small-signal linear transmission
characteristics of a variety of lightwave components. A precise
electrical (signal generator) or optical (laser) source is used to
stimulate the component under test and a very accurate optical
or electrical receiver measures the transmitted signal. Since
characterization over a range of modulation frequencies is
required, the frequency of modulation is normally swept over
the bandwidth of interest.
Measurements are typically comprised of the appropriate ratio
of microwave modulation current (or power) and lightwave
modulation power.
P
mod
Optical
Modulation
Power
Modulated Lightwave
=
E/O Measurement
=
O/E Measurement
=
O/O Measurement
Keysight N4373D Lightwave Component Analyzer, User's Guide
:
Input
P
Out
mod
-------------------------
I
In
mod
I
Out
mod
----------------------- -
P
In
mod
P
Out
mod
-------------------------
P
In
mod
I
:
mod
Electrical
Modulation
Current
DUT
Output
Laser
Photodiode
Fiber
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