Type of Document Dissertation Author Hattori, Haroldo Takashi Author's Email Address firstname.lastname@example.org URN etd-11398-12380 Title Low Nonlinearity Optical Fibers for Broadband and Long-Distance Communications Degree PhD Department Electrical and Computer Engineering Advisory Committee
Advisor Name Title Safaai-Jazi, Ahmad Committee Chair Besieris, Ioannis M. Committee Member Johnson, Lee W. Committee Member Poon, Ting-Chung Committee Member Scales, Wayne A. Committee Member Keywords
- Optical fiber design
- fiber optics
Date of Defense 1998-02-11 Availability unrestricted AbstractA class of low nonlinearity dispersion-shifted and dispersion-flattened fibers for
broadband and long haul applications is presented. The refractive index profiles of these
fibers assume a depressed-core multi-clad geometry in order to achieve effective-areas
much larger than those in conventional optical fibers.
A systematic approach for designing large effective-area dispersion-shifted fibers, using a
reference W-index profile to initiate the design, is presented. Transmission properties,
including effective-area, mode-field-diameter, dispersion, dispersion slope, cutoff
wavelength, and bending, microbending and splice losses are evaluated for several design
examples. To ascertain that the proposed fibers can be practically fabricated, the effects
of varying fiber dimensions and indices on effective-area, mode-field-diameter and
dispersion are assessed.
It is shown that there is a trade-off between effective-area and mode-field-diameter and,
generally, larger effective-areas are associated with larger mode-field-diameters. In other
words, less signal distortion due to fiber nonlinearity (larger effective-area) is associated
with higher power loss due to bending of fiber (larger mode-field-diameter). Thus, a large
effective-area and low bending loss are conflicting requirements. A parameter Q is
defined as a performance indicator, considering effective-area and mode-field-diameter.
Dispersion-shifted single-mode fiber designs with effective-areas of 78 mm
2 to 210 mm2 and the corresponding mode-field-diameter of 8.94 mm to 14.94 mm,
dispersion less than 0.07 ps/nm.km, and dispersion slope of about 0.05 ps/ nm2.km are
presented. Numerical simulations for propagation of pulses in few designed fibers are
performed.Designs of large effective-area dispersion-flattened fibers are also presented,
for the first time we believe. These fibers provide large effective-area and low dispersion
over an extended range of wavelengths. For our design, over the wavelength range of 1.48 mm <
l < 1.58 mm, the effective-area is 75 mm2 to 100 mm2, while the dispersion remains
below 0.7 ps/nm.km.
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