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"ABSTRAKSpecific performance of an optical waveguide can be achieved by solving the eigen value equation of the respective waveguide. A numerical method to obtain dispersion characteristics of a planar waveguide has been executed on a computer program which run on IBM PC or its compatible with 640 KB memory. Coupler prism method was used to measure the waveguide parameters. A focused beam of TE or TM polarized mode of He-Ne laser light is fed into the prism and enters the film of the waveguide. At coupling spot, where the beam strikes the prism base, the thickness C d7 and the refractive index (η2 ) of the waveguide was measured. Using the developed numerical method in this study, the dispersion characteristics of a three- layer and a four-layer waveguides with n1 = 1, n2 = 1.54, n3 = 1.447 and n1 = 1, n2 = 1. 5, n3 = 1.6 n4 = 1.447. respectively, have been obtained. "