Theory of directional couplers including transition region phase shifts

Author

Weierholt, Audun J. ; Neegard, Steinar

Author_Institution

Electron. Res. Lab., Norwegian Inst. of Technol., Trondheim, Norway

Volume

26

Issue

7

fYear

1990

fDate

7/1/1990 12:00:00 AM

Firstpage

1227

Lastpage

1233

Abstract

An analysis is made of the operation of the parallel waveguide directional coupler by incorporating eigenmode phase shifts in the input and output transition regions. The set of modes used in the analysis consists of the orthogonal symmetric and antisymmetric modes of the unperturbed parallel waveguide. It is demonstrated how the switching diagram changes as the transitional phase shifts increase. There is no indication that these built-in phase shifts degrade coupler crosstalk performance for the states normally used. Conditions for symmetric switching are derived

Keywords

crosstalk; directional couplers; eigenvalues and eigenfunctions; optical couplers; optical waveguide theory; antisymmetric modes; built-in phase shifts; coupler crosstalk performance; directional coupler analysis; directional couplers; eigenmode phase shifts; orthogonal symmetric modes; parallel waveguide directional coupler; switching diagram; symmetric switching; transition region phase shifts; unperturbed parallel waveguide; Crosstalk; Dielectrics; Directional couplers; Equations; Helium; Optical waveguides; Symmetric matrices; Transmission line matrix methods; Waveguide theory; Waveguide transitions;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.59662

Filename

59662