Abstract
A novel method for computation of guided mode reflectivity from optical waveguide end-facet is
presented. The method is based on the characteristic Green’s function (CGF) technique formulation combined with
the complex images (CIs) method for dielectric planar waveguides. By separability assumption of the structure, a
uniform and closed-form expression of spatial Green’s function is obtained. Derived expression consists of
discrete and continuous spectrum contributions which denote guided and radiation modes effects, respectively. Having a
full-wave solution, efficient optimization procedure is then used to calculate the exact reflection coefficients of
guided modes at the end-facets. To find mode coupling coefficients, CGF-CI formulation is modified to incorporate
coupling matrix of abruptly terminated waveguides. The main advantage of this method lies in its simple implementation
as well as accuracy for any refractive index contrast. Excellent agreements with rigorous methods are illustrated in
several examples.
© 2014 IEEE
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