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2. System Connections
The user's DUT (an E/O, O/E or O/O device) would substitute into one of the positions shown in the figure and
the remaining system components calibrated or de-embedded out to reveal the DUT response. The MN4765B
can also be connected to VNA Port 1 (and E/O converter to VNA Port 2) if desired.
Figure 2.
Common Color-coding of Patch Cord Ends (green often for FC/APC (angled) and yellow or white often
for FC/PC (non-angled))
The cable on the left (green boot) of
MN4765B O/E module. The two other cables (yellow and white boots) are typical of FC/PC connectors; these
ends should be used with the MN4775A E/O converter. Other lasers and modulators/converters may be
connectorized differently.
The MN4775A (and equivalent units) contain a laser and are accompanied by a warning label like that shown
in
Figure
3. The MN4775A-007x are class 1M and the MN4775A-0040 is class 3B (due to the shorter
wavelength).
Figure 3.
Laser Warning Labels Examples
In addition to the above basic setup, it is possible to improve dynamic range of the measurement in certain
frequency ranges but altering some basic connections to effectively 'reverse' the port 2 test couplers in the VNA
(connections shown in
and reconnected. For the front panel, semi-rigid cables are included in the accessory kit to help accomplish this
task that make use of the loop access points provided by options 51/61/62 in the VNA. In the common
configuration, we are much more interested in S21 than S12, so by reversing the port 2 coupler we improve the
noise floor for S21 at the expense of drive power for S12.
QSG-6
Figure 2
is typically of an FC/APC connector which should be used with the
Figure 4
and
Figure
5). On the rear panel, existing loops are simply rotated 90 degrees
PN: 10410-00777 Rev. B
ME7848A QSG