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Proceedings Paper

Pulse Propagation And Dispersion In Arbitrary Optical Fibers
Author(s): M. D. Feit; J. A. Fleck Jr.
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Paper Abstract

We have developed a general treatment of light propagation and dispersion in arbitrary refractive index profile optical fibers. The method is based on the accurate numerical solution of the scalar wave equation by a combination of operator splitting and Fourier transform techniques. The Fourier representation of the propagating beam allows a dual description of the electric field in both (x,y) and transverse wavenumber space. This dual description affords a precise characterization of such propagation properties as spatial beam confinement, angular confinement (numerical aperture) and losses, all as a function of propagation distance z. In addition, Fourier transformation of the field autocorrelation function with respect to z yields the complete power spectrum containing trapped, "leaky," and radiation modes. The trapped modes appear as distinct spectral lines whose position (modal wavenumber) and amplitude (modal weight) are the ingredients needed to characterize the dispersion of the light pulse. The numerical tools developed allow a general characterization of realistic refractive index profiles including, e.g., losses and fiber bends as appropriate. The method has been applied to a fiber having a square law refractive index profile with a central dip. The cladding was surrounded with a strong absorber so that leaky modes would be rapidly attenuated. The central dip is found to profoundly alter the mode spectrum, principally by removing some of the degeneracy of the square law modes. In addition, the spread of modal group delays is increased by nearly two orders of magnitude, leading to much less favorable dispersive properties.

Paper Details

Date Published: 13 November 1980
PDF: 1 pages
Proc. SPIE 0190, Los Alamos Conference on Optics 1979, (13 November 1980); doi: 10.1117/12.957779
Show Author Affiliations
M. D. Feit, Lawrence Livermore Laboratory (United States)
J. A. Fleck Jr., Lawrence Livermore Laboratory (United States)

Published in SPIE Proceedings Vol. 0190:
Los Alamos Conference on Optics 1979
Donald H. Liebenberg, Editor(s)

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