Scholarly Communications Project

A Generalized Analysis of Multiple-Clad Optical Fibers with Arbitrary Step-Index Profiles and Applications


Taha Mohamed Barake

Master's Thesis submitted to the Faculty of the Virginia Tech in partial fulfillment of the requirements for the degree of

Master of Science


Electrical Engineering


Ahmad Safaai-Jazi, Chair
Ioannis Besieres
Lee Johnson

April 22,1997
Blacksburg, Virginia


A Generalized Analysis of Multiple-Clad Optical Fibers with Arbitrary Step-Index Profiles and Applications
Taha Barake
Committee Chairman: Dr. Ahmad Safaai-Jazi
Electrical Engineering


A generalized analysis of multiple-clad cylindrical dielectric structures with step-index profiles is presented. This analysis yields unified expressions for fields, dispersion equation and cutoff conditions for weakly guiding optical fibers with step-index but otherwise arbitrary profiles. The formulation focuses on triple-clad fibers, but can accommodate single and double-clad fibers as special limiting cases.

Using the generalized solutions, transmission properties of several types of specialty fibers for broadband applications, including dispersion-shifted, dispersion-flattened, and dispersion compensating fibers, are studied. Improved designs for dispersion-shifted and dispersion compensating fibers are achieved.

Fiber parameters and material compositions for the improved designs are provided. The proposed design for the dispersion-shifted fiber yields zero second-order as well as third-order dispersion at the 1.55 micrometer wavelength. The dispersion compensating fiber proposed here provides a large negative dispersion of about -400 ps/ at the 1.55 micrometer wavelength for the fundamental mode. Numerical results for dispersion characteristics, cutoff wavelengths, and radial field distributions are provided.

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