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Novel optical properties of six-fold symmetric photonic quasicrystal fibers

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Abstract

We have investigated optical properties of an optical fiber having a six-fold symmetric quasiperiodic array of air holes in cladding, a six-fold symmetric photonic quasicrystal fiber. The photonic quasicrystal fiber exhibits larger cutoff ratio for endlessly single mode operation than that of a triangular photonic crystal fiber having six-fold symmetry and almost zero ultra-flattened chromatic dispersion, 0±0.05 ps/km/nm, in the range of wavelength from 1490 to 1680 nm. The dispersion value is much less than those of the proposed dispersion flattened PCFs.

©2007 Optical Society of America

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Figures (4)

Fig. 1.
Fig. 1. Schematic cross section of a six-fold symmetric photonic quasicrystal fiber and elementary units of the quasicrystal (dotted lines). Black circles denote air holes. a is the distance between neighboring air holes and d is the diameter of air holes.
Fig. 2.
Fig. 2. V parameters of the six-fold symmetric PQF, VPQF , for various d/a. The values of d/a are inserted as insets and assigned to different colors. VPQF is normalized to π. The dashed line denotes the cutoff value below which a single mode is allowed and circles denote the cutoff wavelength of the second-order mode.
Fig. 3.
Fig. 3. Dispersion behavior of the six-fold symmetric PQF for d /a=0.31 and a = 2.41 μm in the range of wavelength from 1.0 to 1.9 μm. D(λ), D g(λ), and -D m(λ) are denoted by red line, blue line, and black line, respectively.
Fig. 4.
Fig. 4. Dispersion of the six-fold symmetric PQF (red line) and a triangular lattice PCF (blue line) in the range from 1.3 to 1.8 μm for d/a = 0.31 and a = 2.41 μm. The gray region denotes the almost zero ultra-flattened dispersion (0 ± 0.05 ps nm-1 km-1) in the range from 1.49 to 1.68 μm. The detailed dispersion behavior is shown in the inset.

Equations (2)

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V PQF ( λ cutoff ) = π
D ( λ ) D g ( λ ) + D m ( λ ) = λ c d 2 n g ( λ ) 2 λ c d 2 n m ( λ ) 2 ,
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