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Effective-index function method for the analysis and design of inhomogeneous planar waveguides based on the WKB equation

1991; Elsevier BV; Volume: 84; Issue: 5-6 Linguagem: Inglês

10.1016/0030-4018(91)90083-p

1873-0310

Kin Seng Chiang,

Photorefractive and Nonlinear Optics

The effective index that appears in the WKB characteristic equation for a planar waveguide is interpreted as a continuous function of the mode order, which is treated as a real number instead of an integer. Based on this concept, a simple and efficient algorithm is devised to construct this effective-index function and determine the mode indices from it. The use of the effective-index function to synthesize refractive-index profile is discussed and demonstrated with numerical examples.