Abstract
Abstract This paper presents an enhanced hybrid SOA/EDFA/RAMAN optical amplifier design for Dense Wavelength Division Multiplexed (DWDM) Systems at the edge of L & U wavelength bands. A semiconductor optical amplifier is used as a booster in conjunction with the other two kinds of optical amplifiers (EDFA and RAMAN) to achieve better amplification performance. Forty DWDM channels at 10 Gbps in the frequency range 185–185.975 THz spaced by 25 GHz are transmitted over 200 km of standard telecommunication fibre. The hybrid amplifier performance is characterized in terms of maximum gain achieved, gain flatness and amplifier noise figure (NF). A comparison between forward pumping and backward pumping of the RAMAN amplifier is considered for different lengths of the RAMAN fibre. The maximum achieved gain of the hybrid optical amplifier is over 30 dB with 1 dB gain flatness using 30 km of fibre for the RAMAN amplifier with total forward pumping power of 1650 mW and total backward pumping power of 730 mW. However, the hybrid amplifier has a gain of 26 dB and gain flatness better than 0.8 dB when using 25 km of fibre for the RAMAN amplifier with combined total forward pumping power of 1270 mW and total backward pumping power of 850 mW. The amplifier noise figure obtained is less than 5.7 dB for all DWDM channels.
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