Type of Document Dissertation Author Baghdadi, Jihad Abdul-Hadi III Author's Email Address email@example.com URN etd-42198-232533 Title Designs for Zero Polarization-Mode Dispersion And polarization-Maintaining Fibers Degree PhD Department Electrical and Computer Engineering Advisory Committee
Advisor Name Title Besieris, Ioannis M. Indebetouw, Guy J. Riad, Sedki Mohamed Scales, Wayne A. Taylor, Larry T. Safaai-Jazi, Ahmad Committee Chair Keywords
- polarization maintaining fiber
- Polarization-mode dispersion
- optical communications
Date of Defense 1998-05-08 Availability unrestricted AbstractThis 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 mm. 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 mm2 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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