Abstract

In long haul transmission systems, Return to Zero format is suitable to overcome the fiber nonlinear effect like Self phase modulation which occurs due to the variation of the refractive index with the intensity of the pulse .To combat the nonlinearity further, chirped RZ (CRZ) signal format and dispersion managed soliton (DM-soliton) have been proposed which have large resistance to SPM-GVD effect, but they require the wider bandwidth than conventional RZ signals. In terms of robustness to optical power and dispersion tolerance, CS-RZ format is promising, but, spectral efficiency is not so high as VSB-RZ format to be described in this paper. A major concern in VSB-RZ transmission is the growth of the subdued spectral sideband due to fiber nonlinearity during the transmission. We have also observed here that the Qfactor changes almost linearly with distances .As a conclusion VSB-RZ seems a promising modulation format providing narrow spectral width and excellent robustness against nonlinear effects.

Keywords: Vestigial side band, Return to zero format, nonlinearities, Q factor.

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