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The asymmetrical slab nonlinear–waveguide (NLWG), extensively studied in recent years (e.g. [1]), is a good candidate to be used in all–optical–switching. In this paper we study (analytically and numerically) the dependence of the switching properties of the NLWG (see fig. 1) on "a" (half width of the waveguide) and “k0" (vacuum wavenumber). We show that it has two switching modes, whose physical nature and whose performances differ remarkably.
© 1992 Optical Society of America
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