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Measurement Concepts
General Measurement Techniques and Considerations
30
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.
Modulated Lightwave
E/O Measurement
=
O/E Measurement
=
O/O Measurement
=
Agilent N4373A Lightwave Component Analyzer, First Edition
P
:
mod
Optical
Modulation
Power
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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