The study of TE modes of graded-index slab waveguides
Abstract
This paper discusses the analysis of TE modes propagation of a slab waveguide with graded refractive index distribution. The guided modes of the graded-index slab waveguide is based on approximating the actual refractive index distribution by four line segments. The resulting boundary value problem can be solved in terms of Bessel functions or to a very satisfactory approximation by means of the Wentzel-Kramers-Brillouin (WKB) methods. Various modes of waveguides can be excited by means of a prism coupler. The coupling efficiency of the coupler may be analyzed in terms of the attenuation coefficient of a guided wave losing power by radiation as it travels underneath the coupling prism located at the surface of the waveguide. The radiation loss coefficient is a measure of the coupling strength.
- Publication:
-
Imaginative Engineering thru Education and Experience
- Pub Date:
- 1977
- Bibcode:
- 1977ieee.conf...75B
- Keywords:
-
- Coupled Modes;
- Electromagnetic Radiation;
- Optical Waveguides;
- Propagation Modes;
- Transverse Waves;
- Bessel Functions;
- Eigenvalues;
- Refractivity;
- Slabs;
- Wave Attenuation;
- Wentzel-Kramer-Brillouin Method;
- Optics