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The value of the threshold current is model-dependent, there is no typical value for it. The nominal current
is defined as the current that induces emission at nominal power (50mW in the example above).
When setting the current, the unit used is the percentage of the nominal current. When reading the current,
the returned value is expressed in milliAmperes.
Although the setting of “100%” is designed to drive the LBX at nominal power at the beginning of the unit’s
lifespan, the user is allowed to set this current up to 120% of the nominal current in order to cope for a
potential loss of efficiency due to aging.
ACC MODE, ANALOG MODULATION
Here is a typical characteristic curve of a LaserBoxx LBX driven by an external voltage, in ACC mode:
The characteristic curve is as follows:
- The output power almost nil between 0V and a threshold voltage (unit-dependent),
- From that threshold voltage and above, the relationship between the input voltage and the optical
power is linear
The units are optimized so that their threshold voltage is set to the lowest possible value, typically 0.1V.
The maximum reachable value is the last current set point entered (80% in this example).
DIGITAL HIGH-SPEED MODULATION
The digital modulation allows for a high-speed, binary modulation driven by a signal to be applied on the rear
panel of the combiner.
Here is a typical characteristic curve of a LaserBoxx LBX or LCX modulated by this scheme:
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