We introduce an all-optical approach, optical parametric amplification (OPA) processor to suppress the impact of Sun outage in laser satellite communication systems, which is implemented by only one nonlinear semiconductor optical amplifier driven by both electrical and optical pumps. The optimized OPA processor, with a current of 539 mA and a pump-to-signal ratio of 16 dB, could significantly improve the signal quality by 3.5 dB in experiments for the elevation angle of Sun radiation of 0 rad. The signal quality improvement is observed in the whole range of the elevation angle, confirming the effectiveness of the proposed OPA processor in the field of Sun radiation mitigation.