Wavelength Electronics FL500, Datasheet And Operating Manual

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QUICK CONNECT GUIDE, CONTINUED
The FL500 is compatible with Type A and Type B lasers, but
will not drive Type C lasers: see Figure 4 .
Type A Laser Diode Type B Laser Diode
Type C Laser Diode
Common
Cathode
Laser Diode Anode &
Photodiode Cathode Common
Isolated Photodiode
Short the
Laser Diode Anode
to Photodiode Cathode
Common
Anode
Laser Diode Cathode &
Photodiode Anode Common
Figure 4. Laser Type Diagrams
LASER DRIVER TEST LOADS
Figure 5
shows a recommended simulated laser load for
Type A and Type B lasers in Constant Current Mode. To
determine the actual drive current, measure the voltage
drop across the 1 Ω resistor. Do no insert an ammeter in
series with the output circuit; doing so may cause instability
in the control loop.
12
11
1 Ω
2 W
1N4001
1N4001
VDD
LDC
LDA
Figure 5. Laser Driver Test Load
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FL500 LASER DIODE DRIVER