User’s Manual
Published on February 2017 UMn°154 – rev.05 14
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3.2.4. Automatic Shutdown
To prevent any damage on the device we have implement some automatic shutdown. When one of
these conditions is activated, the device immediately shutdown and cannot be start up while the problem
is not solved.
Internel Power supply out of
range
Optical Input power too low
If optical input power is lower
than specified values (see test
report)
Only if input monitoring is
available and automatic
shutdown activated
Optical Output power too low
If optical output power is lower
than specified values (see test
report)
Only if output monitoring is
available
Diode temperature is out of
range
If diode temperature is 5°C
away from set point.
3.3. Principle of regulation
The device offers several modes of operation:
• Automatic Current Control (ACC)
• Automatic Power Control (APC) – Optional
The ACC mode is available on all devices. The availability of other modes depends on the device, see
device’s test report or specifications for more information.
Following paragraphs describe these modes and the way that the electrical board drives the pump
diodes.
3.3.1. Automatic Current Control (ACC)
In Automatic Current Control mode, the amplifier is controlled from the diodes current set point. The
device is running in order to maintain a constant current through the pump laser diodes. A variation of
internal optical parameter (due to temperature for example) will induce a variation of output power.
The maximum current of pump diodes is indicated on product test report.
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