Improved inverse WKB procedure to reconstruct refractive index profiles of dielectric planar waveguides

Optical Waveguides Fabricated by Ion Implantation/Irradiation: A Review Optical Waveguides Fabricated by Ion Implantation/Irradiation: A Review

“…It is, therefore, necessary to make certain approximations in order to obtain the refractive index profiles. Fortunately, by considering only physically possible profiles, the uncertainty is reduced to less than ~20% of the difference between the effective indexes of the first two modes (m = 0, 1) (Hertel & Menzler, 1987). Moreover, there are usually indications that can give us a clue as to what type of profile is expected for each case.…”

Index Profile Reconstruction of Ti: LiNbO3 Structures and Loss Bending Evaluation from Near-Field Measurements

“…»t nite channel width, i.e., to the planar waveguide. The index distributions [7,8] in depth f(y) and width g(x, w) for Ti-diffused LiNbO 3 waveguides are approximated by the following functions:…”

Anisotropic two- and four-wave mixing in planar LiTaO_3:Ti:Fe optical waveguides

“…(15) where the electric field E of each wave is separated into an amplitude A and a normalized electric-field vector (mode) U, E(x,y) = A(x)U(y). The sign ofthe exponent (ax) depends on the propagation direction and is negative (positive) for the waves 1 and 2 (3 and 4).…”