Measurement Concepts
44
Keysight
N4375D Lightwave Component Analyzer, User’s Guide
General Measurement Techniques and Considerations
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
I
mod
:
Electrical
Modulation
Current
Input
DUT
Output
Photodiode
Fiber
Laser
E/O Measurement
P
mod
Out
I
mod
In
-------------------------
=
O/E Measurement
I
mod
Out
P
mod
In
------------------------
=
O/O Measurement
P
mod
Out
P
mod
In
-------------------------
=
Содержание N4375D
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