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Modal analysis of a dielectric waveguide with planar guiding–nonguiding boundaries with a flare in the direction of propagation

✍ Scribed by D. B. Singh; P. Khastgir; U. K. Singh; O. N. Singh

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
128 KB
Volume
17
Category
Article
ISSN
0895-2477

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✦ Synopsis

We make an analytical study of the modal characteristic equation of a slab wa¨eguide with a flare bounded by two planes. We ( ) choose cylindrical polar coordinates , , z , and assume that the two bounding planes are extended infinitely in the z-direction, and are represented by s and s so that y is ¨ery small. The

field in the z-direction is assumed to be uniform, and we consider propagation along the -direction. Using the weak guidance approximation, the characteristic equation is obtained. Numerical computations show that only one global mode can be sustained in such a structure for the model s 0, corresponding to the coordinate . There is an attenuation in this supported mode, and this is because of the flare.

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