Keysight Technologies N4374B, Руководство пользователя

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Measurement Concepts
50
Keysight
N4374B Lightwave Component Analyzer, User’s Guide
Calibration Concept
The key to making accurate EO, OE, or OO measurements is
calibrated instrumentation.
There are a number of calibration stages involved.
The first stage is the
electrical calibration of
the network analyzer.
This calibration
(described in
“Calibrating the
Network Analyzer
before Measurements”
on page 75)
characterizes from the
end of the flexible test
port cable connected to
Port 1, to the end of the
flexible test port cable connected to Port 2.
This establishes the electrical calibration reference planes for
the measurements. Whenever there are additional electrical
adapters or elements required for connecting the device under
test these electrical paths can be accounted for by "RF path
deeembedding" (see “RF Path Deembedding” on page 67).
The second stage is the
calibration of the
optical test set. This is
handled as a “Fixture”
by the network analyzer.
For more information
on Fixtures, please refer
to the documentation of
the network analyzer.
The instrument
lightwave source and
receiver are individually
characterized in the
factory, from Port A to the optical output, and from the optical
input to Port B, respectively.