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Mode selecting characteristics of four‐layer dielectric slab waveguide
Author(s) -
Kudo Masaaki,
Mushiake Yasuto
Publication year - 1982
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs017i001p00125
Subject(s) - waveguide , cutoff frequency , optics , attenuation , materials science , slab , cutoff , transmittance , transverse mode , radiation mode , dielectric , filter (signal processing) , mode (computer interface) , physics , optoelectronics , single mode optical fiber , optical fiber , electrical engineering , computer science , geophysics , operating system , laser , quantum mechanics , engineering
Mode selecting characteristics of four‐layer dielectric slab waveguide have been studied, considering its practical application to the optical integrated circuits as a mode filter. The dimensions of the waveguides discussed here are restricted to the cases where only TE 0 mode or TE 0 and TM 0 modes can exist and higher modes are in cutoff region. Cutoff characteristics and attenuation characteristics for TE 0 and TM 0 modes have been investigated for various waveguide parameters. It has been found from the results of this investigation that the four‐layer waveguide can be utilized as a TE 0 mode filter where only TE 0 mode can propagate without attenuation, provided that the normalized frequency of the waveguide is chosen in the range between two cutoff normalized frequencies for TE 0 and TM 0 modes. In the latter part of this paper, the four‐layer waveguide joined with a three‐layer waveguide has been treated, and transmittance and reflectance for transmitted and reflected waves at the junction and also the fields of the transmitted wave in the neighborhood of the junction have been studied.