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Two‐dimensional finite‐element method calculation of propagation characteristics of axially nonsymmetrical optical fibers
Author(s) -
Oyamada Kimiyuki,
Okoshi Takanori
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/rs017i001p00109
Subject(s) - axial symmetry , bessel function , finite element method , optical fiber , optics , polarization (electrochemistry) , physics , mathematics , geometry , chemistry , thermodynamics
In an axially symmetrical single‐mode optical fiber, the polarization plane of the propagated HE 11 mode is subject to unstable rotation due to slight changes in ambient conditions. Such an instability can be prevented by making the refractive index distribution in the fiber axially nonsymmetrical. This paper describes a two‐dimensional, vectorial‐wave finite‐element method calculation of the propagation characteristics of such axially nonsymmetrical fibers. It is an improved version of Yeh's program; the field outside the central core region is expanded by a series of modified Bessel functions. Some numerical examples are described.