Enhanced-phase-shaped binary transmission

A theoretical assessment of the performance of a new modulation format whic h is of interest for both submarine and terrestrial optical transmission is presented. It consists in increasing the extinction ratio of a standard ph ase-shaped binary transmission (PSBT) signal in order to obtain a high tole rance to both chromatic dispersion and signal-to-noise ratio degradation. T his enables the optical power to be reduced and also therefore nonlinear ef fects, or the amplifier spacing to be increased. Further-more, this modulat ion format yields a high spectral efficiency for wavelength division multip lexing applications.