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Bandwidth Efficient and Dispersion Tolerant Modulation Schemes for Optical Communication Systems

An investigation into high spectral efficiency modulation schemes used in optical communication systems including the effects of fibre chromatic and polarisation mode dispersion and nonlinearity is described. The modulation schemes include optical duobinary AM-PSK and phase shaped binary transmission. The paper reports on transmission distances achievable for 16 10Gb/s DWDM channels over SMF for BER better than 10 and then for dispersion managed configurations. Simulation of the schemes was in VPI software (VPI TransmissionMaker). The spectral efficiency of the modulation schemes, their dispersion tolerance, resulting in longer transmission distances, and the relatively small effect of PMD compared to chromatic dispersion are reported.