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Chapter 4
4.3.1
Modulation
A BNC connector is provided for an external modulation signal. See section 4.5.3.2
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 6560A module (6 Amp
driver) would equate to 60 mA of drive current. However, regardless of the input
voltage, the current cannot exceed the current limit.
4.3.2
Photodiode Bias Control
An adjustment is provided for 0V to 5V reverse bias adjust, except MOPA modules,
which do not have a photodiode bias control and have fixed bias at either 0V or -5V.
4.3.3
Photodiode
A BNC connector is provided for photodiode connections, with the center pin the
anode connection and the outer shell the cathode connection. It is the same input as
pins 6 and 7 in the 9-pin D connector with the anode on the shell. MOPA modules do
not have this BNC connector.
4.3.4
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.
4.4
Connecting to Your Laser
When connecting laser diodes and other sensitive devices to the module, we
recommend that the 6000 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.
Laser Diode Driver Module Operation
CAUTION
Do not connect or disconnect a signal to the modulation
input with the laser on.
CAUTION
Do not disconnect the photodiode with the laser on.
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