Eigenmode analysis of symmetric parallel waveguide couplers

An analysis of a laterally symmetric parallel waveguide structure has been carried out by using symmetric and antisymmetric eigenmodes in the coupled mode equations. As opposed to modes of each individual guide, eigenmodes are orthogonal and therefore comply with coupled mode formalism. Of particula...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 1987-10, Vol.23 (10), p.1689-1700
Main Authors: Weierholt, A., Mickelson, A., Neegard, S.
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Coupled mode analysis
Couplers
Electric, optical and optoelectronic circuits
Electrodes
Electromagnetic coupling
Electromagnetic waveguides
Electronics
Equations
Exact sciences and technology
Integrated optics. Optical fibers and wave guides
Interference
Optical and optoelectronic circuits
Optical waveguides
Voltage
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Summary:An analysis of a laterally symmetric parallel waveguide structure has been carried out by using symmetric and antisymmetric eigenmodes in the coupled mode equations. As opposed to modes of each individual guide, eigenmodes are orthogonal and therefore comply with coupled mode formalism. Of particular interest has been the popular configuration Z -cut LiNbO 3 with Wave propagation along the crystal Y -axis. The theory shows that output versus voltage characteristics are nonperiodic in voltage, and furthermore, they are asymmetric if the eigenmodes are not equally excited. The uniform electrode coupler can easily be explained in terms of eigenmode coupling and interference.
ISSN:0018-9197
1558-1713
DOI:10.1109/JQE.1987.1073219