Laser communication is a method of information transmission that uses laser as a carrier in free space. The transmitter generally selects fiber lasers as the light source, and the Master-Oscillator Power Amplifier Fiber Laser System (MOPA) is widely used in industrial processing, atmospheric laser communication, and defense research due to its high output power, excellent beam quality, reliability, compact structure, and good heat dissipation. This paper first elaborates on the working principle and advantages of the MOPA pulsed fiber laser, followed by the selection scheme and implementation principle of pulsed MOPA lasers for laser communication experiments. Through experimental data, it analyzes the impact of different gain fiber lengths and pump durations on the spectrum during the amplification process of the pulsed seed source in both the first and second stages, while also discussing key considerations during the signal light amplification experiments. Finally, it highlights the advantages of MOPA fiber lasers in the field of laser communication applications.