Abstract

Waveguide structure, consisting of two coupled waveguides was extensively studied [ 1-21. Nowadays many practically useful integrated optics devices are based on it. Recently this structure attracted the attention of researchers again because several new possibilities of its usage were found. The subject of investigation is a pair of waveguides: singlemode waveguide with low refraction index and multimode waveguide formed by layer with high refraction index. The practical realization of this structure is a singlemode fiber with the side polished core and a waveguide layer coupled with this fiber. In recent times some very interesting optical devices (filtering, lasing) were realized on the basis of this system [3-61. Nevertheless the details of light transmission through this structure re- main non completely understood up to now. The aim of this work is theoretical and experimental study of the light propagation in the structure taking in to account variation of the coupling coefficient with distance. We consider propagation for TE-modes.

© 1996 Optical Society of America