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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

Figure

3. The MN4775A-007x/011x 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

panel, existing loops are simply rotated 90 degrees 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.

ME7848A/E QSG

Figure 2

is typically of an FC/APC connector which should be used with the

Figure 4

and

Figure

5). This does not apply to the 110 GHz -0x1x systems. On the rear

PN: 10410-00777 Rev. C

2. System Connections

QSG-7