30 Chapter 3 Laser Diode Driver Module Operation
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.
CAUTION
Do not disconnect the photodiode with the laser on.
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.
NOTE
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.
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.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
