Chapter 3 Laser Diode Driver Module Operation 29
1,2
Interlock
3
Chassis Ground
4,5
Laser Cathode
6
Photodiode Cathode (+)
7
Photodiode Anode (-)
8,9
Laser Anode
Table 1 - Laser Connector Pinouts
For MOPA modules, a 15-pin male D-connector is used for the MOPA cable and a 9-
pin male connector is used for the TEC jumper cable, as shown below.
MOPA Connector
TEC Strap Connector
Pin
Description
Pin
Description
1
TE-
1,2
TE+
2
Analog Ground
5
Ground
3
OSC-/LAS-
6,7
TE-
4
OSC+
8
Therm+
5
+12V Fan
9
Therm-
6
LAS+
7
N/C
8
TE+
9
Interlock+
10
Therm-
11
Therm+
12
MPD+
13
MDP-
14
LED+
15
LED-
Table 2 - MOPA Laser Connector Pinouts
3.3.1 Modulation
CAUTION
Do not connect or disconnect a signal to the modulation
input with the laser on.
A BNC connector is provided for an external modulation signal. See section 3.5.3.2
for a description of modulation bandwidth.
Each 100 mV change in the modulation input is equal to 1% of the maximum drive
current of the module. For example, 100 mV input on a 6560 module (6 A driver)
would equate to 60 mA of drive current. However, regardless of the input voltage,
the current cannot exceed the current limit.
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