Waveguide loss evaluation by the ray-optics method

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Abstract
Attenuation constants of bound or leaky modes in a general class of straight planar waveguides evaluated by the ray-optics method are analytically shown to be identical in the first-order of approximation with those obtained from the characteristic equation when one takes the Goos–Hänchen shift into account. It is also pointed out that significant errors will result if the Goos–Hänchen shift is ignored.

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