Coupled-mode analysis of an asymmetric nonlinear directional coupler

Author

Yasumoto, Kiyotoshi ; Maeda, Hiroshi ; Maekawa, Naoto

Author_Institution

Dept. of Comput. Sci. & Commun. Eng., Kyushu Univ., Fukuoka, Japan

Volume

14

Issue

4

fYear

1996

fDate

4/1/1996 12:00:00 AM

Firstpage

628

Lastpage

633

Abstract

A coupled-mode analysis of an asymmetric planar nonlinear directional coupler (NLDC) is presented by using the singular perturbation technique. The NLDC consists of a nonlinear waveguide with the core of Kerr-like medium and a linear waveguide situated parallel to each other. The effects of linear coupling and nonlinear modification of refractive index are treated to as small perturbations, and the modal fields of isolated linear waveguides are employed as the basis of propagation model. The self-consistent coupled-mode equations governing the power transfer are derived in analytically closed form. The representative numerical result for the input/output characteristics demonstrates that the asymmetric NLDC is useful for constructing a band-pass power-filter or a band-reject power-filter

Keywords

coupled mode analysis; optical Kerr effect; optical couplers; optical directional couplers; optical waveguide theory; perturbation techniques; perturbation theory; refractive index; symmetry; Kerr-like medium core; analytically closed form; asymmetric NLDC; asymmetric nonlinear directional coupler; asymmetric planar nonlinear directional coupler; band-pass power-filter; band-reject power-filter; coupled-mode analysis; input/output characteristics; isolated linear waveguides; linear coupling; linear waveguide; modal fields; nonlinear modification; nonlinear waveguide; power transfer; propagation model; refractive index; self-consistent coupled-mode equations; singular perturbation technique; small perturbations; Coupled mode analysis; Directional couplers; Equations; Nonlinear optics; Optical filters; Optical refraction; Optical signal processing; Optical variables control; Optical waveguides; Perturbation methods;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.491402

Filename

491402