Abstract
In the present paper, the impact of defect insertion in
the core area of a large core HF7 fiber on the effective mode area
and chromatic dispersion characteristics is investigated to enhance
the performance parameters of photonic crystal fibers (PCF). The
obtained results meet the requirements of the wideband high-speed
optical transmission systems. A novel method for increasing the
effective mode area of PCFs without increasing the hole pitch is
presented that is based on the mode field distribution modification
by defect insertion. Furthermore, it is shown that the dispersion
curve is predictable from the effective mode area variations in response
to changing the defect parameters. Based on the aforementioned
characteristics, the first fully systematic procedure to design
a large mode area, dispersion flattened, low-loss and single-mode
PCF is presented and employed to design a defected core fiber with
chromatic dispersion of 2.9 ± 0.5 ps/(km nm) in the S+C+L communication band with effective mode area larger than 80 µm<sup>2</sup> in the same wavelength range with excellent loss and single-modeness
properties.
© 2010 IEEE
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