Effects of Air Gaps on Butt-Joints between Isotropic and Anisotropic Planar Waveguides

Masashi HOTTA  Masahiro GESHIRO  Katsuaki KANOH  Haruo KANETAKE  

IEICE TRANSACTIONS on Electronics   Vol.E76-C   No.8   pp.1345-1349
Publication Date: 1993/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Opto-Electronics
butt-joint,  anisotropic waveguide,  air gap,  beam propagation method,  transmission coefficient,  

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Power transmission properties are investigated for a butt-joint which contains an air gap between an isotropic planar waveguide and an anisotropic one whose optical axis is lying in the plane defined by the propagation axis and the normal of the waveguide surface. New transmission coefficients are introduced for estimating the optical-power which is launched out into the gap from the incoming waveguide. Wave propagation through the gap is analyzed on the basis of the BPM concept. And the power transmitted across the interface between the gap and the outgoing waveguide is evaluated by means of the overlap integral of the field profiles. The effects of the air gap and the refractive index of filling liquid as well as axial displacement and angular misalignment are discussed on the basis of numerical results.