Behavior of the first higher-order modes of a circular core optical fiber whose core cross-section changes into an ellipse

Author

Eguchi, Masashi ; Koshiba, Masanori

Author_Institution

Sapporo Sch. of Arts, Japan

Volume

13

Issue

2

fYear

1995

fDate

2/1/1995 12:00:00 AM

Firstpage

127

Lastpage

136

Abstract

The vector finite element method is used for investigating the behavior of a set of the first higher-order, four-fold degenerate modes (TE₀₁, TM₀₁, and two-fold degenerate HE₂₁ modes) of a circular core optical fiber whose core cross-section changes into an ellipse. It is found that the TE₀₁ mode becomes the first higher-order mode polarized along the minor axis, E ₂₁^y mode, in a dual-mode region. The remaining three modes become, respectively, the first higher-order mode polarized along the major axis, E₂₁^x mode, and the second higher-order modes polarized along the major and minor axes, E₁₂^x and E₁₂^y modes, in the order of magnitude of the effective index. It is also found that the effective index of the E₂₁^x mode is smaller than that of the E₂₁^y mode in a small ellipticity region

Keywords

finite element analysis; optical fibre polarisation; optical fibre theory; refractive index; vectors; E₂₁^y mode; TM₀₁; circular core optical fiber; core cross-section; dual-mode region; effective index; ellipse; first higher-order modes; four-fold degenerate modes TE₀₁; major axis; minor axes; minor axis; polarized; small ellipticity region; two-fold degenerate HE₂₁ modes; vector finite element method; Finite element methods; Helium; Magnetic cores; Optical fiber couplers; Optical fiber polarization; Optical fiber sensors; Optical fibers; Strain measurement; Tellurium; Vibration measurement;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.365197

Filename

365197