WDM Soliton Transmission System Using Dispersion Slope Compensators

Abstract

Abstract-A new scheme of dispersion slope compensator by writing Bragg gratings at different positions in a dispersion compensation fiber is proposed for the wavelength division multiplexing soliton transmission system. This scheme can compensate in-line for the accumulated dispersion of each channel and suppress the dispersive waves which are caused by the incomplete filtering of the signals of the neighboring channels by using Fabry-Perot or Butterworth filters and the different propagating paths of the signals of the different channels in the dispersion slope compensator. Index Terms-Dispersion slope compensation, fiber Bragg grating, optical solitons. T HE wavelength-division-multiplexing (WDM) soliton transmission system is limited by the timing jitter caused by the soliton interactions, the amplifier spontaneous emission (ASE) noise (Gordon-Haus effect), and the unsymmetrical collisions between different channels. By using the dispersion compensation fibers (DCF's) [1]- In the DSC, some fractional energy of the signal of a channel appears in the neighboring paths because of the incomplete filtering process due to the finite spectral side-level of the optical bandpass filter. This fractional pulse propagates in a different path from the principal pulse. After the DSC the fractional pulses lead or lag behind the principal pulse