Abstract

The gain flattening of erbium doped fiber amplifier (EDFA) is essential for their application in wavelength
division multiplexing (WDM) system. This paper attempts to design and analyse a 32 channels WDM
system using EDFA in the wavelength range of 1546 to 1560 nm with channel spacing of 0.4 nm. The
analysis is made for the data rate of 10 Gb/s of NRZ signal. The gain flattening of EDFA in such system is
achieved through EDFA’s pump power and input power variation. Results show that the gains are
flattened within 43.6 ± 0.8 dB with noise figure about 7.38 dB at pump power of 600 mW and input power
of -34 dBm using optimized erbium doped fiber of 6.2 m length. The performance analysis in terms of
BER, eye diagram and Q factor shows satisfactory results.