2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/153203In the framework of Gurevich and Pitaevskii approach [1] we construct modulated by Whitham [2] solution of nonlinear Shrodinger (NS) equation partially saturating the modulational instability. This solution describes new scenario of monochromatic wave evolution in NS equation which leads to generation of new phase and oscillation region.4 pages, LaTEX, version 2.09, submitted to JETP LettPattern Formation and Solitonstext