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We investigate nonlinear Kerr-induced coherence effect on a superluminalprobing light pulse in a gain-assisted N-type 4-level atomic system via anintense monochromatic laser field. The dispersion exhibits a novel, interestingand useful two-paired double gain lines processes. The system displays losslesscharacteristics similar to [L. J. Wang, A. Kuzmich, A. Dogariu, Nature\textbf{406}, 277 (2000)] but with advantages of \emph{multiple}\textbf{controllable} anomalous regions, \emph{significantly enhanced}superluminal behavior and \textbf{relaxed} temperature, states of matterregardless of its isotropic or anisotropic conditions. Unlike the instabilityin [A. M. Akulshin, S. Barreiro, and A. Lezama, Phys. Rev. Lett. \textbf{82},4277 (1999)], the present system also \emph{overcomes the instable-limit} bythe Kerr-induced coherence effect in the system. Indeed, the coherence enhancesthe group velocity remarkably by at least $-30 ms$ more than of an instableKerr-free system with almost negligible distortion in the retrieved pulse.

Avoidance of instability of a superluminal Gaussian light pulse via control of nonlinear coherence Kerr effect in a gain-assisted medium