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OPERATION
Connecting to the Laser
04_06 LDX-3232 11
CHAPTER 2
grounds in the circuit. Multiple earth grounds may provide circuit paths that induce
spurious currents in the photodiode feedback circuit and output leads.
Note: Cable connections to the laser must be secure! Loose connections can cause
momentary open circuits that can damage the laser.
Figures 2.1 - 2.4 show the possible configurations of connecting laser diodes and
photodiodes with the LDX-3232 High Compliance Laser Current Source.
Figure 2.1 Common Laser Cathode - Photodiode Cathode
Figure 2.2 Common Laser Cathode - Photodiode Anode
Figure 2.3 Common Laser Anode - Photodiode Cathode
+
-
+
Bias
LDX-3232 Current Source
OUTPUT
7
6
9
5
3
P. D. L. D.
Earth Ground
+
-
+
Bias
OUTPUT
7
6
9
5
3
P. D. L. D.
Earth Ground
LDX-3232 Current Source
+
-
+
Bias
OUTPUT
7
6
9
5
3
P. D. L. D.
Earth Ground
LDX-3232 Current Source