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ABSTRACT: This paper proposes and demonstrates a novel type of silica index guiding holey fibers (IGHFs) that has two cladding layers
at the defective innermost structures. The proposed IGHFs exhibit remarkable chromatic dispersion properties such as nearly-zero
and flattened dispersion over a wide spectral range and single mode guidance along with very low confinement loss. The numerical
results indicate that 5 air-hole rings of nearly zero ultra-flattened dispersion single mode IGHFs can be designed with desire
flattened dispersion of over a 340 nm bandwidth including the entire band of interest with low confinement loss of less than
10−6 dB/m.
Keywordsfiber characterization-flattened chromatic dispersion-confinement loss
Optical Review 04/2012; 16(3):351-354. · 0.66 Impact Factor
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ABSTRACT: A new simple structure of an index-guiding highly nonlinear dispersion-flattened square photonic crystal fiber (HNDFSPCF)
with low confinement losses is proposed. The results reveal that it is possible to design five-rings HNDF-SPCFs with a flattened
dispersion of 0.43 ps/(nm·km), low dispersion slope of -0:02 ps/(nm2·km), low confinement loss of approximately 103 dB/m, and a large nonlinear coefficient of approximately 35W-1 km-1 at 1.55 μm. It is also observed that the confinement loss is less than 10-1 dB/m in the wavelength range of 1.2 –1.7 μm.
Optical Review 04/2012; 14(3):120-124. · 0.66 Impact Factor
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ABSTRACT: In this paper, we report that it is possible to control chromatic dispersion of index guiding PCFs in wide wavelength range
by arranging the major axis of the first inner ring perpendicular to that of the second inner ring. Using this unique arrangement,
a newly PCF with ultra-low and ultra-flattened dispersion is designed through a finite difference method with anisotropic
perfectly matched layers absorbing boundary condition. As an example, we have design a unique PCF with flattened dispersion
of ±0.23 ps/(nm·km) from 1.5 to 1.8 μm wavelength and confinement losses of less than 10−13 dB/m in the wavelength range shorter than 1.8 μm.
Optical Review 04/2012; 15(2):91-96. · 0.66 Impact Factor
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ABSTRACT: This paper presents dispersion-flattened modified hexagonal photonic crystal fibers (MH-PCFs) with extremely low confinement
loss. The finite difference method (FDM) with an anisotropic perfectly matched boundary layer (PML) is used to investigate
the chromatic dispersion and confinement properties. It is demonstrated that it is possible to obtain an ultra-flattened dispersion
of 0 ± 0:41 ps/(nm·km) in the wavelength range of 1.35–1.65 mm and an extremely low confinement loss of less than 10−4 dB/km from a four-ring MH-PCF. Effective single-mode operation of the MH-PCF is confirmed for the entire band of interest.
Optical Review 04/2012; 14(4):165-168. · 0.66 Impact Factor
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IEICE Transactions. 01/2008; 91-C:113-116.
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IEICE Transactions. 01/2007; 90-C:1627-1633.
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ABSTRACT: This paper presents a novel technique for the control of chromatic dispersion and confinement loss in hexagonal photonic crystal
fibers (H-PCFs). It is demonstrated that it is possible to obtain very low chromatic dispersion of 0 ± 0:38 ps/(nm·km) in
the wavelength range of 1.41 to 1.66 μm and confinement loss of less than 0.0001 dB/km from a six ring modified H-PCF (MH-PCF).
The higher order dispersion at 1.55 μm is about −0.001 ps/(nm2-km).
Optical Review 12/2006; 14(1):14-16. · 0.66 Impact Factor
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ABSTRACT: This paper describes near-zero ultra-flattened chromatic dispersion and low confinement loss that can be achieved from a decagonal photonic crystal fiber (D-PCF). The finite difference method with anisotropic perfectly matched boundary layer (PML) is used for the numerical analysis. It is demonstrated that it is possible to design a four-ring D-PCF with ultra-flattened dispersion of 0 ± 0.69 ps/(nm-km) in a 1.30 to 1.75 μm wavelength range and 0 ± 0.22 ps/(nm-km) in a 1.35 to 1.65 μm wavelength range with very low confinement losses of order 0.0011 dB/km. The proposed D-PCF shows promising dispersion tolerance.
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ABSTRACT: This paper reveals a novel dispersion compensating photonic crystal fiber (DC-PCF) for wide-band high-speed transmission systems. The finite-difference method with an anisotropic perfectly matched absorbing layers boundary condition is used to investigate the guiding properties. The designed novel DC-PCF shows that it is possible to obtain a larger negative dispersion coefficient, better dispersion slope compensation, and confinement losses less than 10−4 dB/m in the entire S+C+L telecommunication band by using a modest number of design parameters. The proposed module can be used in 40 Gb/s dense wavelength division multiplexing (DWDM) systems in optical fiber communication networks.
Optics & Laser Technology.
