P-HFOA were simulated and compared at OPP via OptiSystem software.  The S-HFOA has a high average gain and an appropriate NF, but the gain bandwidth is limited.  The P-HFOA has a wide 3-dB gain bandwidth and high saturation power as compared to the S-HFOA.. In this work, two different configurations of hybrid fiber optic amplifiers are investigated and simulated via OptiSystem 7.0 software, namely, serial and parallel hybrid fiber optical amplifiers (S-and P-HFOAs). The investigation involves performance comparison for the S-and P-HFOA under optimum pump conditions to demonstrate the advantages and disadvantages of each configuration.The simulation results show that the serial configuration has a high average gain level of 19.2 dB, an appropriate noise figure about 4.3 dB, but low saturation power, and limited gain bandwidth of approximately 40 nm, which is considered a primary issue in S-HOFA design, in addition to the pump conversion efficiency still insufficient in the Raman amplifier stage. While in P-HFOA design, a wide 3-dB gain bandwidth of more than 60 nm is maintained, along with an average gain level of 13.5 dB, high average noise figure about 8.3 dB and high saturation power due to the absent of cascading effect in parallel configuration.