Title :
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
fDate :
2/1/1995 12:00:00 AM
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 21y mode, in a dual-mode region. The remaining three modes become, respectively, the first higher-order mode polarized along the major axis, E21x mode, and the second higher-order modes polarized along the major and minor axes, E12 x and E12y modes, in the order of magnitude of the effective index. It is also found that the effective index of the E21x mode is smaller than that of the E21y mode in a small ellipticity region
Keywords :
finite element analysis; optical fibre polarisation; optical fibre theory; refractive index; vectors; E21y 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;
Journal_Title :
Lightwave Technology, Journal of
