Anritsu Company VectorStar ME7848A-0140 Посібник із швидкого старту - Сторінка 6
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2. System Connections
2.
System Connections
The basic system connections are illustrated in
similar setup for the 110 GHz systems is used, except the VNA is a broadband configuration). Port 1 of the
VNA is connected to the E/O modulator (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
and will be assumed in the rest of this document. |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. 1 mm (W)
cables are torqued normally to 4 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/011x 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 and MN4775A-011x). This fiber patch cord should be polarization-maintaining (usually
denoted by a blue jacket cover) for stable operation of the modulator.
QSG-6
Figure 1
(for the 40 and 70 GHz system configurations; a
PN: 10410-00777 Rev. C
Figure 1
is the most common
ME7848A/E QSG