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Optical Engineering

Intensity distributions and cutoff frequencies of linearly polarized modes for a step-index elliptical optical fiber
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Paper Abstract

Intensity distributions of linearly polarized (LP) propagation modes of several orders are plotted for a step-index elliptical-core dielectric waveguide. A simplified characteristic equation is obtained through the weakly guiding approximation, which can be used to find the propagation constants and the cutoff frequencies of each LP mode. These constants are then applied to the solution of the scalar wave equation, which is expanded in series of ordinary and modified Mathieu functions, to obtain the intensity patterns of the LP modes. Results are compared with previous work, and it is found that when the elliptical core tends to a circle (ratio of semimajor to semiminor axis equal to 1.0001) our cutoff frequencies are closer to the LP-mode cutoffs of the circular fiber than are the cutoffs obtained in other papers on elliptical fibers.

Paper Details

Date Published: 1 April 2007
PDF: 11 pages
Opt. Eng. 46(4) 045003 doi: 10.1117/1.2719698
Published in: Optical Engineering Volume 46, Issue 4
Show Author Affiliations
Ivan Gomez-Castellanos, Instituto Tecnológico y de Estudios Superiores de Monterrey (Mexico)
Ramon M. Rodriguez-Dagnino, Instituto Tecnológico y de Estudios Superiores de Monterrey (Mexico)

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