Today with Titouan, we installed a 10-90% fiber coupler between the EOM and the amplifier to have a diagnostic of the fiber injection power level.

65mV on 1kohms on the diagnostic photodiode is equivalent to 1.3mW injected to the 1st stage of the amplifier.
One has to get at least 50mV on the photodiode to inject 1mW to the 1st stage of the amplifier.

we used the included 1st stage photodiode which has to be above 200mV on 50 ohms.
one has 250mV on this photodiode

the 2nd stage photodiode seems to be broken.
one can use an internal tap for diagnotic or open the amplifier box and try to fix the photodiode.
to be done...