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A basic review of the critical features of linear magneto-optics is given, as a precursor to an extensive discussion of complex nonlinear magneto-optic waveguides. An elegant global envelope approach is used for an investigation of spatial solitons influenced by nonreciprocal behavior, controlled by the presence of magnetic materials. The kind of complex planar waveguides discussed have great potential in nonlinear optics, because they are destined to support and enhance a major change in the technology of programmable chip-level devices. After addressing the fundamental magneto-optic properties and the kind of materials needed, the envelope theory exploits the Voigt effect, instead of the more obvious Faraday effect. This choice leads to desirable design features. Spatial-soliton light beams are deployed because they can be stably generated within a planar waveguide. The attractive features of the type of magneto-optic waveguides investigated are highlighted with a few numerical simulations that promise useful formats for the fully integrated isolator functionality that modern laser systems demand.
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