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2.
System Connections
The basic system connections are illustrated in
(the MN4775A in the -02xx systems) and Port 2 of the VNA is connected to the MN4765B O/E calibration
module. The ports can, of course, be swapped and the optical de-embedding software will support such a swap,
but the configuration shown in
|S12| will be in the noise floor of the VNA in this common configuration. All RF cables (K(2.92 mm) or V(1.85
mm)) should be torqued to the usual 8 in-lbs.
This section discusses connections for the -02xx systems. Many of the steps are similar for -01xx systems, but
those configurations may have different E/O converters, so details related to that part of the system will vary.
Figure 1.
Typical ME7848A Measurement Setup
An optical patch cord is used to connect the E/O converter to the O/E module. The MN4765B is connectorized
for FC/APC fiber (and those patch cord connections are often denoted by a green boot). The MN4775A (and
many other modulators) is connectorized for FC/PC fiber (and those connections are often denoted by a white
boot). The accessory kit includes a FC/PC-FC/APC adapting patch cord for this purpose... it is important to
orient the cable appropriately (while some surface scratching or other damage of the fiber ends is unlikely,
high insertion loss will be the outcome for reversing the patch cord). Example pictures of these different boots
are shown in
Figure
2. If another patch cord is used, check with the vendor for color coding information.
The MN4775A-007x models have a loopback fiber between the laser output and modulator input, as shown in
Figure 1
(not present in the -0040 model), that must be connected (and is included with the MN4775A-007x).
This fiber patch cord should be polarization-maintaining (usually denoted by a blue jacket cover) for stable
operation of the modulator.
ME7848A QSG
Figure
Figure 1
is the most common and will be assumed in the rest of this document.
PN: 10410-00777 Rev. B
1. Port 1 of the VNA is connected to the E/O modulator
2. System Connections
QSG-5