Departement de Physique de l' Universite des Sciences et Techniques de Masuku;
B.P. 943 Franceville;
Gabon;
Ecole Normale Superieure;
B.P. 2889 Libreville;
Gabon;
Laboratory of Mechanics;
Department of Physics;
Faculty of Science;
University of Yaounde I;
Yaounde;
Cameroon;
Max Planck Institute for the Physics of Complex Systems;
Dresden;
Germany;
Modulational; Instability; Modified; Gross-Pitaevskii; Equation; Quantum; Fluctuations;