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Advanced modulation formats of 40-Gb/s DWDM ultralong-reach optical communication systems

We report advanced modulation formats in transmission systems operating for 40Gb/s DWDM for multi-Tb/s photonic transport networks including (1) efficient RZ, RZ-CS, RZ-CS VSB for optimizing dispersion tolerance in linear and nonlinear operating regimes (2) disperison management and compensation techniques (3) equalization of gain by lumped and distributed amplification. Simulated and some experimental results are given.