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Chapter 3
3.3.2
Photodiode Bias Control
An adjustment is provided for 0V to 5V reverse bias adjust on single channel
modules. Dual, Combo, and MOPA modules do not have a photodiode bias control
and have fixed bias at either 0V or -5V.
3.3.3
Photodiode
A BNC connector is provided for photodiode connections. It is the same input as
pins 6 and 7 in the 9-pin D connector with the anode on the shell. MOPA and combo
modules do not have this BNC connector.
3.3.4
Interlock
Except on MOPA modules, the interlock pins, 1 and 2, must be connected together to
complete the circuit and allow the laser operation. Pin 1 is connected to a +5V supply
through a 10 kΩ resistor, and pin 2 is connected to ground through a 1 kΩ resistor. On
MOPA modules, the interlock pin 9 is connected to pin 2.
3.4
Connecting to Your Laser
When connecting laser diodes and other sensitive devices to the module, we
recommend that the 8000 be powered-up and the laser output be off . In this
condition, a low impedance shunt is active across the output terminals. When
disconnecting devices, it is only necessary to turn the laser output off.
Except for MOPA modules, pins 4 and 5 of the 9-pin D-connector are the negative
output, and pins 8 and 9 are the positive output current connections. These pins are
jumpered to provide greater contact area for the output connection.
We also recommend the use of the 9-pin D-connector for your interface rather than
binding posts, or loose wires. This will insure the best connection.
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Laser Diode Driver Module Operation
CAUTION
Do not disconnect the photodiode with the laser on.
Whenever external connections are made to the output at
pins 4 and 5, and 8 and 9, these connector leads should be
jumpered to ensure the greatest laser diode safety.
NOTE
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