Title :
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
fDate :
7/1/1990 12:00:00 AM
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;
Journal_Title :
Quantum Electronics, IEEE Journal of
