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Weak guidance modal dispersion characteristics of an optical waveguide having a core with a sinusoidally varying gear‐shaped cross section
Author(s) -
Singh Vivek,
Ojha S. P.,
Prasad B.
Publication year - 1999
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/(sici)1098-2760(19990720)22:2<129::aid-mop15>3.0.co;2-q
Subject(s) - modal , cutoff , dispersion (optics) , modal dispersion , microwave , waveguide , cutoff frequency , core (optical fiber) , optics , section (typography) , aspect ratio (aeronautics) , point (geometry) , physics , cross section (physics) , matching (statistics) , acoustics , materials science , engineering , optical fiber , geometry , mathematics , dispersion shifted fiber , telecommunications , optoelectronics , computer science , fiber optic sensor , composite material , operating system , statistics , quantum mechanics
We present a rigorous study of a circular waveguide which, due to a manufacturing defect or due to deliberate choice, takes a new shape resembling that of a gear. Goell's point‐matching method under weak guidance is used to study the modal dispersion curves of the proposed waveguide for an aspect ratio (the ratio of two orthogonal dimensions) of ( b / a )=0.1 and 0.2. It is found that the dispersion curves are similar in nature in both cases. When these findings are compared with the cutoff behavior of the circular fiber under weak guidance, it is seen that the cutoff values are shifted toward higher values of the V‐parameter as the aspect ratio is increased from 0.1 to 0.2. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 22: 129–133, 1999.