Abstract
A new class of three-core linear directional coupler is demonstrated, in which the centers of the cross-section of the waveguides (WGs) form the vertices of a triangle. Gaussian-type interaction is assumed to couple each WG directly to other WGs. By employing coupled mode equations under slowly varying envelope approximation, we numerically analyze the optical field dynamics in the three transmission channels. Under different parameter conditions, the coupler exhibits wide-ranging characteristics including nonadiabatic to adiabatic evolution of light transfer in versatile manners.
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