title: Modulational instability of discrete solitons in coupled waveguides with group velocity dispersion.
abstract: We study temporal modulational instability of spatial discrete solitons in waveguide arrays with group velocity dispersion (GVD). For normal GVD we report existence of the strong 'neck'-type instability specific for the discrete solitons. For anomalous GVD the instability leads to formation of the mixed discrete-continuous spatio-temporal quasi-solitons. Feasibility of experimental observation of these effects in the arrays of silicon-on-insulator waveguides is discussed.
authors.forename: A
authors.initials: A
authors.lastname: Yulin
authors.forename: Dmitry V
authors.initials: DV
authors.lastname: Skryabin
authors.forename: A
authors.initials: A
authors.lastname: Vladimirov