Title :
Comparison between strong coupling theory and experiment for three-arm directional couplers in Ti:LiNbO/sub 3/
Author :
Peall, R.G. ; Syms, R.R.A.
Author_Institution :
Dept. of Eng. Sci., Oxford Univ., UK
fDate :
3/1/1989 12:00:00 AM
Abstract :
The derivation of scalar coupled mode theory for TEM waveguide arrays is examined. It is demonstrated that four previously published methods are identical at this level of approximation. The accuracy of the theory and its application to a slab-waveguide model of a three-arm coupler is considered. It is shown that the coupled mode equations require modification for slowly varying arrays. Analytic expressions for the matrix coefficients are presented, and it is demonstrated that device input-output transitions have significant effect on the response. The model is compared with experimental measurements of three-arm couplers fabricated in Ti:LiNbO/sub 3/, and excellent qualitative agreement is obtained.<>
Keywords :
directional couplers; lithium compounds; optical couplers; optical waveguide theory; titanium; LiNbO/sub 3/:Ti; TEM waveguide arrays; input-output transitions; matrix coefficients; scalar coupled mode theory; slab-waveguide model; three-arm directional couplers; Dielectric measurements; Directional couplers; Equations; Holographic optical components; Holography; Microwave devices; Modal analysis; Optical waveguides; Transmission line matrix methods; Waveguide theory;
Journal_Title :
Lightwave Technology, Journal of
