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

Volume

7

Issue

3

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

540

Lastpage

554

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;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.16892

Filename

16892