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This paper demonstrates the comparison of 40 Gbps DWDM system using hybrid optical amplifier configurations (EDFA-EDFA and EDFA-SOA ) are implemented with RZ and NRZ encoding techniques at various distance along with DCF having dispersion 80 ps/nm/Km . DWDM systems with 4 channels each having a bit rate of 10 Gbps and 0.8 nm equal channel spacing. The performance of EDFA-EDFA and EDFA-SOA hybrid optical amplifiers with different modulation formats (NRZ and RZ) are evaluated in terms of BER, eye height and Q-factor. EDFA-EDFA performed better upto 200 km as compared to EDFA-SOA optical amplifiers at 100 km distance with NRZ format. For RZ format EDFA-EDFA performance of DWDM system is also good upto 250 km as compared to EDFA-SOA upto 120 km. In this paper, DWDM system using EDFA-EDFA yields better result than EDFA-SOA and also for RZ encoding technique communication is achieved more distance than NRZ encoding technique.

Investigation of 40 Gbps DWDM Optical System by using Hybrid Optical Amplifier with Different Modulation Formats