Ultra-flattened dispersion and high nonlinearity in a square lattice photonic crystal fiber
05 Jul 2010-pp 340-341
TL;DR: In this paper, the structure of square lattice photonic crystal fiber (SPCF) was proposed and confirmed by the finite element method that it has both ultra-flattened near-zero dispersion and high nonlinearity.
Abstract: We proposed the new structure of square lattice photonic crystal fiber (SPCF) and confirmed by the finite element method that it has both ultra-flattened near-zero dispersion and high nonlinearity
Citations
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TL;DR: In this article, an algorithm that adapts the mature stack and draw (SaD) methodology for fabricating the exotic equiangular spiral photonic crystal fiber (ES-PCF) was presented.
Abstract: We present an algorithm that adapts the mature stack and draw (SaD) methodology for fabricating the exotic equiangular spiral photonic crystal fiber (ES-PCF). The principle of Steiner chains and circle packing is exploited to obtain a nonhexagonal design using a stacking procedure based on hexagonal close packing. The optical properties of the proposed structure are promising for supercontinuum generation. This approach could make accessible not only the equiangular spiral but also other quasi-crystal PCF through SaD.
25 citations
Cites background from "Ultra-flattened dispersion and high..."
...Such properties could include flat dispersion [1], high non-linearity [2], large birefringence [3], increased optical through put [4], mode discrimination for fiber lasers [5] and others that may not be realizable with conventional periodic structures....
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TL;DR: In this article, a tunable single polarizing filter is proposed by selectively coating gold film on the air holes of photonic crystal fiber (PCF), which is evaluated by the finite-element method.
Abstract: A tunable single polarizing filter is proposed by selectively coating gold film on the air holes of photonic crystal fiber (PCF). The polarization properties of the PCF filter are evaluated by the finite-element method. Simulation results show that the loss of y-polarized core mode at 1250 and 1550 nm is 136.23 and 839.73 dB/cm, respectively. Furthermore, we innovatively combine stable modulation with flexible modulation. To be specific, the resonance wavelengths are slowly controlled in a small wavelength range by altering the diameter of the air-hole-coated gold film, while the resonance wavelengths are flexibly controlled in a wide wavelength range by altering the thickness of the gold film or the diameter of the small air holes. When the length of the PCF is 500 µm, the bandwidth of extinction ratio greater than − 20 dB is only 60 nm at the communication window of 1550 nm. It is beneficial to fabricate a narrow-band polarization filter.
14 citations
TL;DR: In this article, a simple square-lattice photonic crystal fiber (PCF) with nearly zero flattened dispersion (NZFD) was proposed to obtain relatively low confinement loss and high nonlinearity.
10 citations
01 Jan 2018
TL;DR: In this paper, a brief study of photonic crystal fibers and recent developments and modifications presented to them for betterment of the optical parameters is presented, and the properties birefringence, nonlinearity, confinement loss, and chromatic dispersion are discussed.
Abstract: We present a brief study of the photonic crystal fibers and recent developments and modifications presented to them for betterment of the optical parameters. The properties birefringence, nonlinearity, confinement loss, and chromatic dispersion are discussed, and the fiber structures of the fiber designed from the past few years have been studied. The PCFs can be seen as the future of a number of optical applications owing to its low chromatic dispersion, low confinement loss, high birefringence, and nonlinearity, and, the best of all, its flexibility to modify its structural aspects to manipulate these properties as desired.
References
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Book•
01 Jan 1989TL;DR: The field of nonlinear fiber optics has advanced enough that a whole book was devoted to it as discussed by the authors, which has been translated into Chinese, Japanese, and Russian languages, attesting to the worldwide activity in the field.
Abstract: Nonlinear fiber optics concerns with the nonlinear optical phenomena occurring inside optical fibers. Although the field ofnonlinear optics traces its beginning to 1961, when a ruby laser was first used to generate the second-harmonic radiation inside a crystal [1], the use ofoptical fibers as a nonlinear medium became feasible only after 1970 when fiber losses were reduced to below 20 dB/km [2]. Stimulated Raman and Brillouin scatterings in single-mode fibers were studied as early as 1972 [3] and were soon followed by the study of other nonlinear effects such as self- and crossphase modulation and four-wave mixing [4]. By 1989, the field ofnonlinear fiber optics has advanced enough that a whole book was devoted to it [5]. This book or its second edition has been translated into Chinese, Japanese, and Russian languages, attesting to the worldwide activity in the field of nonlinear fiber optics.
15,770 citations
TL;DR: In order to control dispersion and dispersion slope of indexguiding photonic crystal fibers (PCFs), a new controlling technique of chromatic dispersion in PCF is reported and it is shown from numerical results that it is possible to design a fourring PCF with flattened dispersion.
Abstract: In order to control dispersion and dispersion slope of indexguiding photonic crystal fibers (PCFs), a new controlling technique of chromatic dispersion in PCF is reported. Moreover, our technique is applied to design PCF with both ultra-low dispersion and ultra-flattened dispersion in wide wavelength range. A full-vector finite element method with anisotropic perfectly matched layers is used to analyze the dispersion properties and the confinement losses in a PCF with finite number of air holes. It is shown from numerical results that it is possible to design a fourring PCF with flattened dispersion of 0 +/- 0.5 ps/(km.nm) from 1.19 m to 1.69 m wavelength range and a five-ring PCF with flattened dispersion of 0 +/- 0.4 ps/(km.nm) from 1.23 m to 1.72 m wavelength range.
675 citations
"Ultra-flattened dispersion and high..." refers background in this paper
...In index-guided photonic crystal fibers (PCFs), much more sophisticated dispersion control could be achieved by modifying air hole array structures, diameter/pitch size, which changes the effective index profiles [ 1 ]....
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...Dispersion controlled optical fibers has been one of the most important issues in optical communications and in recent years, it is gaining intense attention along with optical nonlinearity for new applications such as supercontinuum generation [ 1 ]....
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...which is much lower than prior dispersion flattened PCFs [ 1 ]....
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TL;DR: The literature describes more than 30 measurements, at wavelengths between 249 and 1550 nm, of the absolute value of the nonlinear refractive-index coefficient of fused silica, and best currently available values were selected for the wavelengths of 351, 527, and 1053 nm.
Abstract: The literature describes more than 30 measurements, at wavelengths
between 249 and 1550 nm, of the absolute value of the nonlinear
refractive-index coefficient of fused silica. Results of these
experiments were assessed and best currently available values were
selected for the wavelengths of 351, 527, and 1053 nm. The best
values are (3.6 ± 0.64) × 10-16
cm2/W at 351 nm, (3.0 ± 0.35) ×
10-16 cm2/W at 527 nm, and (2.74 ±
0.17) × 10-16 cm2/W at 1053
nm.
362 citations
"Ultra-flattened dispersion and high..." refers background in this paper
...where λ is the signal wavelength, n2 is nonlinear refractive index of silica [ 6 ]....
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TL;DR: The sensitivity of the total dispersion to small variations from the optimal value of specific structural parameters is analyzed, and the fabrication accuracy required for the reliable fabrication of holey fibers is estimated.
Abstract: We employ a Genetic Algorithm for the dispersion optimization of a range of holey fibers (HF) with a small number of air holes but good confinement loss. We demonstrate that a dispersion of 0 ± 0.1 ps/nm/km in the wavelength range between 1.5 and 1:6 µm is achievable for HFs with a range of different transversal structures, and discuss some of the trade-offs in terms of dispersion slope, nonlinearity and confinement loss. We then analyze the sensitivity of the total dispersion to small variations from the optimal value of specific structural parameters, and estimate the fabrication accuracy required for the reliable fabrication of such fibers.
239 citations
"Ultra-flattened dispersion and high..." refers result in this paper
...On the other hand, compared to the previous dispersion flattened PCFs [ 4 ], the fundamental mode of the proposed SPCF structure can provide an extremely...
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TL;DR: In this article, a new simple structure of an index-guiding highly nonlinear dispersion-flattened square photonic crystal fiber (HNDFSPCF) with low confinement losses is proposed.
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.
19 citations
"Ultra-flattened dispersion and high..." refers methods in this paper
...Prior S-PCFs [2, 3 ] had reduced hole size in the first layer and neighboring layers....
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