Ultra-Long Haul DWDM Transmission with Differential Phase Shift Keying Dispersion Managed Soliton

It is shown by numerical simulation that differential phase shift keying (DPSK) dispersion managed soliton (DMS) has significant advantages in ultra-long haul DWDM optical transmission. Because each WDM channel has identical, uniform pulse intensity pattern, phase-coded DMS eliminates timing jitters caused by cross phase modulation of neighboring WDM channels, such as nonlinear polarization rotation, phase-coded system fundamentally allows polarization mux, increasing the total system capacity. We show that the fundamental limitation in DPSK-DMS is the ASE induced nonlinear phase noise. Results of numerical simulations for 10Gb/s DWDM transmission are presented and compared for DPSK DMS and OOK DMS system.