Aiming at the phenomenon of surplus channel output gain drift caused by channel number variation

a competitive all-optical gain control amplifier is studied

which can realize the gain control of signals with wide input power range. For the input power ranging from-40 to 5 dBm

the gain variation is reduced from 22.0 to 0.4 dB. In addition

in the case of multiple channels

the gain variation caused by change of channel number and channel power is reduced to 0.23 dB and 0.10 dB

respectively. The operating range and control amplitude of the amplifier are better than the traditional all-optical gain method

which has important reference value for controlling the stability of the output gain of the remaining channel.