Title :
A finite differences method for the reconstruction of refractive index profiles from near-field measurements
Author :
Caccavale, Federico ; Segato, Francesco ; Mansour, Ibrahim ; Gianesin, Massimiliano
Author_Institution :
Dipt. di Fisica, Padova Univ., Italy
fDate :
7/1/1998 12:00:00 AM
Abstract :
A new method for the reconstruction of refractive index profiles of optical waveguides from the intensity profile of the fundamental mode, as measured with near field (NF) technique, is presented. In this procedure, an analytical expression of the index profile as function of some parameters such as the maximum index variation and depth is given. By a finite differences (FD) algorithm, the wave equation is solved in order to find the effective index and the intensity profile of the fundamental mode. The input parameters are then varied in order to minimize the difference between the measured intensity profiles and the calculated ones. An application of the method to the special case of planar Ti:Mg:LiNbO3 waveguides is presented
Keywords :
finite difference methods; lithium compounds; magnesium; optical noise; optical planar waveguides; optical testing; optical waveguide theory; refractive index; titanium; LiNbO3:Ti,Mg; effective index; finite differences algorithm; finite differences method; fundamental mode; input parameters; intensity profile; maximum index variation; measured intensity profiles; near field technique; near-field measurements; optical waveguides; planar Ti:Mg:LiNbO3 waveguides; refractive index profile reconstruction; wave equation; Finite difference methods; Integrated optics; Noise measurement; Optical devices; Optical interferometry; Optical noise; Optical refraction; Optical variables control; Optical waveguides; Refractive index;
Journal_Title :
Lightwave Technology, Journal of
