Premium
Modal dispersion curves of metal‐clad concave lens shaped waveguides and their comparative study
Author(s) -
Kumar N.,
Srivastava S. K.,
Ojha S. P.
Publication year - 2003
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.10772
Subject(s) - lens (geology) , optics , dispersion (optics) , cutoff , modal , distortion (music) , cutoff frequency , microwave , waveguide , modal dispersion , materials science , physics , mathematics , optoelectronics , optical fiber , quantum mechanics , composite material , amplifier , fiber optic sensor , cmos , dispersion shifted fiber
This paper presents a comparative study of dispersion characteristics of metal‐clad waveguides with concave‐lens‐like cross sections. Using the point‐matching method under weak‐guidance approximation, the modal characteristic equation is derived and the modal dispersion curves are obtained. The proposed waveguide may be conceived as a distortion of the square waveguide with a transverse compression at one pair of its parallel sides in order to become concave lens shaped. We find that, the effect of the concave lens shaped distortion is to shift the lowest cutoff value ( V c ) towards a larger V value, and increases the number of modes. It is also observed that the lowest cutoff value increases gradually with the increase in the compression depth. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 36: 388–392, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10772