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1. An apparatus comprising:
an optical line terminal (OLT) configured to supply, to a network, preheat current information, drive current information, and time slot information which are used for amplifying input optical burst signals in an upstream direction; a semiconductor optical amplifier configured to amplify the input optical burst signals, no optical signal being included between the input optical burst signals; and a controller configured to supply, based on the preheat current information, the drive current information, and the time slot information which are received from the network, preheat currents corresponding to the no optical signal periods between the input optical burst signals and drive currents corresponding to the input optical burst signals in time slots to the semiconductor optical amplifier so as to maintain a constant output level of the input optical burst signals output from the semiconductor optical amplifier and suppress an overshoot gain.
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