The embodiment of the invention relates to a burst luminous signal amplification method, a burst luminous amplifer, a system and a communication system. The burst luminous signal amplification method comprises the steps: combing fill-in lights and signal lights into a mixed light through a combiner and then outputting, wherein the fill-in lights are non-burst lights, the signal lights are burst lights, and the power sets of the fill-in lights is dependent of the watt level of the signal lights; generating pumping lights; and combing the pumping lights and the mixed light by a wave division multiplexer and then inputting a gain medium to obtain the amplified mixed light. In the burst luminous signal amplification method, the burst luminous amplifer, the system and the communication system, due to the occurrence of the fill-in lights, the burst luminous signal amplifer works in an amplification state all the time, the gain medium is provided with the pumping lights which can directly amplify the entered signal lights, thereby reducing the delay time of opening the burst luminous amplifer, improving the transient response speed of the burst luminous amplifer and avoiding generation of surging and signal distortion.