title: Spatiotemporal discrete multicolor solitons.
abstract: We have found various families of two-dimensional spatiotemporal solitons in quadratically nonlinear waveguide arrays. The families of unstaggered odd, even, and twisted stationary solutions are thoroughly characterized and their stability against perturbations is investigated. We show that the twisted and even solitons display instability, while most of the odd solitons show remarkable stability upon evolution.
authors.affiliation: ICFO-Institut de Ciencies Fotoniques, and Department of Signal Theory and Communications, Universitat Politecnica de Catalunya, 08034 Barcelona, Spain. Xu.Zhiyong@upc.es
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Xu
authors.forename: Yaroslav V
authors.initials: YV
authors.lastname: Kartashov
authors.forename: Lucian-Cornel
authors.initials: LC
authors.lastname: Crasovan
authors.forename: Dumitru
authors.initials: D
authors.lastname: Mihalache
authors.forename: Lluis
authors.initials: L
authors.lastname: Torner