Optical Filter Utilizing the Directional Coupler Composed of the K-and Ag-ion Exchange Waveguides

Kiyoshi KISHIOKA  Kazuya YAMAMOTO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E79-C   No.10   pp.1405-1412
Publication Date: 1996/10/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Electromagnetic Theory-Foundations and Applications)
Category: 
Keyword: 
optical filter,  optical device,  optical (integrated) circuit,  ion-exchange waveguide,  directional coupler,  

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Summary: 
This paper describes a narrow pass-band optical filter utilizing a wavelength-sensitive power-transfer characteristic in the directional coupler composed of the K-and Ag-ion exchange waveguides which have greatly different dispersion relations caused by the large mismatch in the index profile of the waveguide cross-section. A narrow pass-band width of about 7 nm is measured in the filter fabricated in the soda-lime glass substrate. The fabrication technique with two-step ion-exchange of the K-and Ag-ions, is also presented together with a quick design method.