The main objective of this simulation study is to observe the profile effects of pre-amplification and post-amplification to the value of output power and bit error rate (BER) performance in the metropolitan ring network. Four types of main profile are introduced and studied, its effects on BER performance and output power are compared via maximum number of nodes allowed. We observed the first gain value gives the significant effect to the initial BER value. The effect of over amplifying on degrading the BER measurement also is also highlighted. Finally we propose the BER improvement by optimizing the value of gain based on the load line analysis. The Opti-System simulation is used to obtain the desired research objective and analysis the results.

EDFA, gain, load line, BER, ring network, performance improvement, maximum node