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Since the input stage of the bias-T is a bipolar transistor, applied
voltage must be higher than about 0.6V to start bias current. The input
stage has maximum voltage limit of 2.6V, but the laser itself may be
destroyed at lower bias-T control voltage already, therefore the maximum
rating has to be checked with the abovementioned rules and together
with Alpes Lasers SA.
The monitor output (if available) allows measurement of applied DC bias
current: Its voltage divided by 10 
gives bias current. In general,
bias current can be in the range of 0.1A, but this must be checked with
Alpes Lasers SA before.
Avoid reverse polarity on the input!