O P E R A T I O N
Installation
01_04
LDX-3412
9
C H A P T E R
2
Figure 2.5 Common Laser Cathode - Photodiode Anode
Figure 2.6 Common Laser Anode - Photodiode Cathode
Figure 2.7 Common Laser Anode - Photodiode Anode
If a feedback photodiode is used which is electrically isolated from the laser, the
feedback circuit must be resistively "tied" at some point to the output circuit. A
large resistance of 1 Mohm, connected from the laser cathode to the photodiode
anode, may be used in place of the direct connection. This is done to keep the
feedback inputs within the specified m6 volt common mode voltage,
relative to the "-" laser current output terminal. The circuit of Figure 2.5 should be
used, if feasible.
+
-
+
Bias
Module
OUTPUT
7
6
9
5
3
P. D.
L. D.
Earth Ground
+
-
+
Bias
Module
OUTPUT
7
6
9
5
3
P. D.
L. D.
Earth Ground
+
-
+
Bias
Module
OUTPUT
7
6
9
5
3
P. D.
L. D.
Earth Ground
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