Mid-span Spectral Inversion System with Random Triangular Dispersion Maps

In dispersion-managed links with mid-span spectral inversion (MSSI) systems, the symmetry of the cumulative dispersion profile is important for compensating the distorted wavelength division multiplexing (WDM) signals.The triangular dispersion map has antipodal symmetry with respect to the midway optical phase conjugator (OPC).A triangular dispersion map is proposed in this paper that has a singularity in which the lengths of the optical fibers that contribute to forming the cumulative dispersion profile are determined randomly.We analyzed three types for randomly determining and deploying the length of optical fibers to form the triangular dispersion map.We confirmed that triangular dispersion maps combined with MSSI systems are more advantageous for distorted WDM channel compensation than traditional uniform dispersion maps are.In particular, the dispersion map created via the "random-inverse" scheme, which randomly arges the optical fiber lengths of each span before the midway OPC while reversing the arrangement of the optical fiber lengths in the sections after the midway OPC, results in the best compensation.