When the input optical power of the amplifier at the receiving end OAU is lower than the nominal optical power, which of the following are wrong in the operation?
A . Adjust the dimmable fading before the terminating amplifier to increase the input optical power of the amplifier
B . Set the OAU gain so that its output reaches the nominal value
C . Improve the sending optical power of the originator
D . When the input optical power cannot be increased by adjusting the adjustable attenuator, the adjustable attenuation at the input of the amplifier is removed.
Answer: C