Title page for ETD etd-42198-232533

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 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
  • birefringence
  • polarization maintaining fiber
  • Polarization-mode dispersion
  • optical communications
Date of Defense 1998-05-08
Availability unrestricted
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 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.

  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
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  jb-ac-co.pdf 25.10 Kb 00:00:06 00:00:03 00:00:03 00:00:01 < 00:00:01
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  jb-chap6.pdf 12.11 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01
  jb-refer.pdf 36.10 Kb 00:00:10 00:00:05 00:00:04 00:00:02 < 00:00:01
  jb-ti-ab.pdf 8.00 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01

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