Type of Document	Dissertation
Author	Baghdadi, Jihad Abdul-Hadi III
Author's Email Address	jbaghdad@vt.edu
URN	etd-42198-232533
Title	DESIGNS FOR ZERO POLARIZATION-MODE DISPERSION AND POLARIZATION-MAINTAINING FIBERS
Degree	Doctor of Philosophy
Department	Electrical and Computer Engineering
Advisory Committee	Advisor Name Title Dr. Larry T. Taylor Guy J. Indebetouw Ioannis M. Besieris Sedki M. Riad Wayne A. Scales Dr. Ahmad Safaai-Jazi chair
Keywords	Polarization-mode dispersion polarization maintaining fiber birefringence optical communications
Date of Defense	1998-05-08
Availability	unrestricted
Abstract This dissertation addresses several aspects pertaining to polarization in optical fibers and optical waveguide devices. In particular, the analysis and design of fibers that maintain polarization over long lengths, provide zero polarization-mode dispersion, and function as polarizers or mode filters are presented. First, optimum designs for high-birefringence as well as single-polarization single-mode fibers are studied. For high-birefringence fibers, several index profiles were obtained that provided high birefringence while achieving zero or very small dispersion in 1.3 um and 1.55 um windows. Also, few index profiles were found that resulted in single-polarization single-mode operation with zero or very small dispersion at about 1.3 um and 1.55 um. A wavelength range of 100 um to 500 um was achieved for truly single-mode operation. Second, a comprehensive analysis of polarization-mode dispersion in a multiple-clad fiber due to ellipticity of fiber cross-section is carried out. The analysis results are then used to design large effective area single-mode dispersion-shifted fiber that provides zero polarization-mode dispersion at the wavelength 1.55 um. Effective area on the order of 122 um*um with mode-field diameter of about 10 um have been attained for this design. Tolerance analysis on the transmission parameters due to 1% and 2% variations in the radii of the fiber layers is carried out. Finally, a wedge-shape dielectric waveguides bounded by conducting planes is introduced and analyzed. Conductor and dielectric losses for the fundamental mode in waveguides with wedge angle of 180/n degree; n greater or equal to 1, and 360/3 degree as a special case with noninteger azimuthal number have been evaluated. These waveguides generally support fewer number of modes for smaller wedge angles and the modes cannot be of TM type. They find applications as mode filters and polarizers.
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