OPTICAL WAVEGUIDE ANALYSIS USING THE FOURIER TRANSFORM AND ITS APPLICATION TO INTERSECTING WAVEGUIDES.

In analyzing inhomogeneous waveguides, this paper derives an analytical method that is effective even for the radiation mode light. Also, the propagation characteristic of intersecting waveguides is studied by using this method. In this analysis, considering virtual waveguides that include the real waveguides that include the real waveguide completely, the propagation propagating light is expressed by the Fourier transform with virtual modes set up in the virtual waveguides. Applying this method to intersecting waveguides having inhomogeneous index gradients, we study the dependency of the propagation characteristics of the intersecting angle and the index gradient difference.