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We demonstrate a novel scheme to generate Return to Zero Differential Phase Shift Keying (RZ-DPSK) modulation signal that only one using single Mach Zehnder Modulation (MZM) format with hybrid Raman and Erbium Doped Fiber Amplifier (EDFA) configuration that can compensate for dispersion impairment and improve nonlinear effects to investigate transmission distance performances in the 48 × 40 Gbit/s Dense Wavelength Division Multiplexing (DWDM) system. The proposed 48 × 40 Gbit/s DWDM system scheme successfully employs single MZM RZ-DPSK modulation format to reduce modulation complex configuration with employs hybrid Raman/EDFA configuration to promote the power signal and using Single Mode Fiber (SMF) with Dispersion Compensation Fiber (DCF) in 27 spans over 3240 km ultra-long haul fiber transmission successfully.

RZ-DPSK Modulation Signal Generation using Only One Mach-Zehnder Modulator for 48 × 40 Gbit/s Ultra Long Haul DWDM Transmission