Higher order mode conversion induced by discontinuities in waveguides

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In this paper, we provide a theoretical prediction about the likelihood of producing high-order modes using, as far as we know, the simplest mode converter. The mode converter is a simple discontinuous waveguide for which reflection and transmission have recently been reported. As a result of the scattering of the fundamental guided mode (TE0), we have found that the high-order mode excitation is highly dependent on the position of the discontinuity. On the one hand, we discovered that in the presence of a discontinuity in the propagation direction, only even modes (TE0 and TE2) are excited, skipping the odd mode (TE1). When a lateral shift is considered, however, both even and odd higher-order modes (TE1 and TE2) are generated. Furthermore, after some lateral shifting, we found that only the pure TE2 mode is propagated.

Original languageEnglish
Article number051301
JournalRevista Mexicana de Fisica
Issue number5
StatePublished - Sep 2023

Bibliographical note

Publisher Copyright:
© (2023), (Sociedad Mexicana de Fisica). All Rights Reserved.


  • FDTD method
  • Fourier transforms
  • Waveguide discontinuities
  • high-order modes
  • mode conversion


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