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For the first time,it is experiementally verified that the index profile of K~+—Na~+ion-exchanged waveguide in CdS_xSe_(1-x)doped glass follows a second-order polynomial dis-tribution.Mode-dispersion curves have been obtained by computing simplified mode equationin WKB approximation and verified by experiment.Diffusion constant has been measured ac-curately.Technical basis is provided for the design and fabrication of all-optical switching de-vices in this kind of nonlinear waveguide.
For the first time, it is experiementally verified that the index profile of K ~ + -Na ~ + ion-exchanged waveguide in CdS_xSe_ (1-x) doped glass follows a second-order polynomial dis-tribution. Mode-dispersion curves have been obtained by calculating simplified mode equation in WKB approximation and verified by experiment. Diffusion constant has been measured ac-curately. Technical basis is provided for the design and fabrication of all-optical switching de-vices in this kind of nonlinear waveguide.