Title :
Guided modes of Ti:LiNbO3 channel waveguides: a novel quasi-analytical technique in comparison with the scalar finite-element method
Author :
Strake, E. ; Bava, G.P. ; Montrosset, I.
Author_Institution :
Angewandte Phys., Univ.-GH-Paderborn, West Germany
fDate :
6/1/1988 12:00:00 AM
Abstract :
Two different techniques for the calculation of optical modes of Ti:LiNbO3 channel waveguides are presented. The first one is an almost analytical technique based on the effective-refractive-index method. The second one is based on the well-known finite-element method. Both approaches use a rather realistic waveguide model considering crystal anisotropy, wavelength dispersion of the refractive index distributions, and also the nonlinear dependence of the ordinary refractive index on the Ti4+ concentration. Effective indices and field distributions obtained by both techniques are compared for wavelengths of 0.6 and 1.2 μm, for both quasi-TE and -TM polarization, considering Y-cut and Z-cut crystal orientation and both isotropic and anisotropic Ti4+ diffusion
Keywords :
finite element analysis; light polarisation; lithium compounds; optical waveguide theory; optical waveguides; refractive index; titanium; 0.6 micron; 1.2 micron; LiNbO3:Ti; Y-cut crystal orientation; Z-cut crystal orientation; channel waveguides; crystal anisotropy; effective-refractive-index method; guided modes; optical modes; quasi-TE-polarisation; quasi-TM-polarisation; scalar finite-element method; wavelength dispersion; Anisotropic magnetoresistance; Electromagnetic waveguides; Finite element methods; Geometrical optics; Nonlinear optics; Optical refraction; Optical variables control; Optical waveguides; Refractive index; Titanium;
Journal_Title :
Lightwave Technology, Journal of
