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This brings up menu DE3 (top left).
Step 7.
Select READ CAL FILE FROM SD CARD or
READ CAL FILE FROM USB DRIVE depending
on where the 12-term calibration was saved in
Step 3.
This bring up menu DSK2 (middle left).
Step 8. Select the calibration file and press Enter.
Step 9. Read the S2P file (characterization data file) for the
photo-diode transfer standard. This will de-embed
the photo-diode for an E/O measurement (menu
DE3A, bottom left).
NOTE
If an S2P file is not available, it can be gen
-
erated from the characterization data pro-
vided by the vendor. This is explained on
page 8-74.
The VNA now displays the measurement of the mod-
ulator DUT. An example measurement of a 40 Gb/s
NRZ modulator is shown in Figure 8-35 below.
37xxxE OM 8-67
MEASUREMENTS OPTICAL APPLICATION
MENU DE3
E/O MEASUREMENT
ORIGINAL CAL FILE
WITH FWD TRANS
CORRECTION
READ CAL FILE
FROM SD CARD
READ CAL FILE
FROM USB DRIVE
PRESS <ENTER>
TO SELECT
PRESS <CLEAR>
TO ABORT
MENU DSK2
SELECT FILE
TO READ
TESTCAL CAL
PREVIOUS MENU
PRESS <ENTER>
TO SELECT
PRESS <1> FOR
PREVIOUS PAGE
PRESS <2> FOR
NEXT PAGE
MENU DE3A
E/O MEASUREMENT
TRANSFER STANDARD
TO BE DE-EMBEDDED
(DETECTOR STD)
READ S2P FILE
FROM SD CARD
READ S2P FILE
FROM USB DRIVE
PRESS <ENTER>
TO SELECT
PRESS <CLEAR>
TO ABORT
Figure 8-35. E/O Measurement of a 40 Gb/s NRZ Modulator