MX40G, MX70G Series of E-O Converters
Chapter 4: Operating Instructions
Rev. E, March 19, 2019
Page 13
Thorlabs provides a file (.s2p format) with each E-O converter that contains the S
21
magnitude and phase response of the
modulator across its frequency range of operation. These data are used to perform the de-embedding process. Note that most
modern E-E VNA systems provide a built in function for doing this type of de-embedding based on the user-supplied .s2p file.
This is the easiest method. However, the de-embedding process can also be performed manually. These methods are
described in detail in the "De-Embed Application Note" PDF document, which is accessible by visiting
www.thorlabs.com/manuals
and entering the item # of your E-O Converter.
A typical frequency response for each converter is plotted below in Figure 18. The phase response is not shown.
Figure 18
Typical Frequency Response of the MX40G Series and MX70G Series
4.3
Control Loop Diagram
The following diagram shows the control loops added to the block diagram. From this picture, the user can see how the power
monitors and VOA are used to provide stability and control to the whole system. It will be helpful to refer to this diagram to gain
a better understanding of the functionality of the unit as described in the upcoming sections of the manual.
Figure 19
Block Diagram of the Converter Showing Control Loops
0
5
10
15
20
25
30
35
40
-4
-3
-2
-1
0
1
MX40G Typical Frequency Response
Pow
er (
d
B)
Frequency (GHz)
0
10
20
30
40
50
60
70
-7
-6
-5
-4
-3
-2
-1
0
1
2
MX70G Typical Frequency Response
Pow
er (
d
B)
Frequency (GHz)
Summary of Contents for MX40G Series
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