22
22
21
22
22
21
12
12
11
CC
CD
CS
DC
DD
DS
SC
SD
SS
S
S
S
S
S
S
S
S
S
Differen-
tial mode
Stimulus
Single
Ended
Stimulus
Common
mode
Stimulus
Port 2
Port 1
Port 2
Port
1
Differential Mode
Response
Common Mode
Response
Single Ended
Response
Port
2
Port
2
Port 1
(unbalanced,
SE)
Port 2
(balanced,
BAL)
Differential mode
Common mode
Single-ended
Balanced OE
Balanced EO
22
22
21
22
22
21
12
12
11
CC
CD
CS
DC
DD
DS
SC
SD
SS
S
S
S
S
S
S
S
S
S
Differen-
tial mode
Stimulus
Single
Ended
Stimulus
Common
mode
Stimulus
Port 2
Port 1
Port 2
Port
1
Differential Mode
Response
Common Mode
Response
Single Ended
Response
Port
2
Port
2
Port 1
(unbalanced,
SE)
Port 2
(balanced,
BAL)
Differential mode
Common mode
Single-ended
22
22
21
22
22
21
12
12
11
CC
CD
CS
DC
DD
DS
SC
SD
SS
S
S
S
S
S
S
S
S
S
Differen-
tial mode
Stimulus
Single
Ended
Stimulus
Common
mode
Stimulus
Port 2
Port 1
Port 2
Port
1
Differential Mode
Response
Common Mode
Response
Single Ended
Response
Port
2
Port
2
Port 1
(unbalanced,
SE)
Port 2
(balanced,
BAL)
Differential mode
Common mode
Single-ended
Balanced OE
Balanced EO
Measurement Concepts
Keysight
N4375D Lightwave Component Analyzer, User’s Guide
55
Figure 5
Balanced Measurement types for opto-electronic components
Calibration Concept
The key to making accurate EO, OE, or OO measurements is
calibrated instrumentation.
There are a number of calibration stages involved.
With the N4375D "Lightwave Component Analyzer" all
calibrations and measurements relate to a valid electrical
calibration. For single- ended measurements, this is a full
2- port calibration. for balanced measurements, this is a full
3- port calibration. Any electrical and optical factory
calibrations are made with reference to the front panel of
the "Optical Test Set" of the N4375D "Lightwave Component
Analyzer".
The internal optical transmitter of the N4375D "Lightwave
Component Analyzer" has a calibrated optical transmission
over frequency to the "Optical Output" on the front panel
with respect to an electrical calibration plane on "Port A" on
the front panel.
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