MODAL DISPERSION CHARACTERISTICS OF A SINGLE MODE DIELECTRIC OPTICAL WAVEGUIDE WITH A GUIDING REGION CROSS-SECTION BOUNDED BY TWO INVOLUTED SPIRALS

With the use of scalar field approximation we make an analytical study of a dielectric waveguide whose core cross-section is bounded by two spirals of the form 1/r = ξθ. This waveguide is similar to that of a distorted slab waveguide in which both a curva