共查询到20条相似文献,搜索用时 31 毫秒
1.
2.
We propose a new structure of broadband nearly-zero flattened dispersion highly nonlinear photonic crystal fiber (PCF). Through optimizing the diameters of the first two inner rings of air-holes and the GeO2 doping concentration of the core, the nonlinear coefficient is up to 47 W^-1.km^-1 at the wavelength of 1.55 um and nearly-zero flattened dispersion of ±0.5 ps/(nm·km) is achieved in the telecommunication window (1460 - 1625 nm). Due to the use of GeO2-doped core, this innovative structure can offer not only a large nonlinear coefficient and broadband nearly-zero flattened dispersion but also low leakage losses. 相似文献
3.
New nonlinear and dispersion flattened photonic crystal fiber with low confinement loss 总被引:1,自引:0,他引:1
A new nonlinear dispersion flattened photonic crystal fiber with low confinement loss is proposed. This fiber has threefold symmetry core. The doped region in the core and the big air-holes in the 1st ring can make high nonlinearity in the PCF. And the small air-holes in the 1st ring and the radial increasing diameters air-holes rings in cladding can be used to achieve the dispersion properties of the PCF. We can achieve the optimized optical properties by carefully selecting the PCFs structure parameters. A PCF with flattened dispersion is obtained. The dispersion is less than 0.8 ps/(nm km) and is larger than −0.7 ps/(nm km) from 1.515 μm to 1.622 μm. The nonlinear coefficient is about 12.6456 W−1 km−1, the fundamental mode area is about 10.2579 μm2. The confinement loss is 0.30641 dB/km. This work may be useful for effective design and fabrication of dispersion flattened photonic crystal fibers with high nonlinearities. 相似文献
4.
Shubi F. Kaijage Yoshinori Namihira Nguyen H. Hai Feroza Begum S. M. Abdur Razzak Tatsuya Kinjo Hiroki Higa Nianyu Zou 《Optical Review》2008,15(1):31-37
In this paper, we present a dispersion controlling technique with a multiple defect-core hexagonal photonic crystal fiber
(MD-HPCF). By omitting air holes in the core region of the conventional HPCF and adjusting the size of air holes around the
newly formed core, we can successfully design low flattened dispersion PCF with low confinement loss, as well as high birefringence.
The low flattened dispersion feature, as well as the low confinement losses and high birefringence are the main advantages
of the proposed PCF structure, making it suitable as chromatic dispersion controller, dispersion compensator, and/or polarization
maintaining fiber. 相似文献
5.
We present a modified method to design photonic crystal fibers with flattened dispersion characteristics. By replacing the circular air-holes of the first central ring with elliptic air-holes, we observe a more flattened dispersion curve. Plane-wave expansion (PWE) method is used to analyze the dispersion property in a high-index core PCF. The simulation results are presented, and ultra-low and ultra-flattened dispersion curves over wide wavelength range are demonstrated. 相似文献
6.
High birefringence and low loss circular air-holes photonic crystal fiber using complex unit cells in cladding 总被引:2,自引:0,他引:2
Tzong-Jer Yang Yuan-Fong Chau Ming-Je Sung Din Ping Tsai 《Optics Communications》2008,281(17):4334-4338
We propose a high birefringence and low loss index-guiding photonic crystal fiber (PCF) using the complex unit cells in cladding by the finite-element method. Results show that the birefringence and confinement loss in such PCF fiber is determined not only by the whole cladding asymmetry but also the shape of the PCF core. The maximal modal birefringence and lowest confinement loss of our proposed structures at the excitation wavelength of λ = 1550 nm can be achieved at 8.7 × 10−3 and 5.27 × 10−5 dB/km, respectively. 相似文献
7.
本文以自制Ge20Sb15Se65硫系玻璃为基质材料,设计一种正八边形结构色散平坦型中红外硫系光子晶体光纤,并采用多极法对其中红外色散和传输特性进行数值研究.结果表明:控制该光纤占空比(d/Λ)在0.323—0.367之间,其色散及传输特性在3—5μm范围内可调.当孔间距Λ=3.4μm,孔直径d=1.1μm时,光纤在4.1—4.9μm波段的色散值在0.8—0.8 ps·nm 1·km 1波动,且具备单模低损耗传输(Loss0.049dB/m),小模场面积(Aeff8.46μm2)特性,适合于中红外非线性应用领域. 相似文献
8.
用平面波展开法对光子晶体光纤中电磁场的Maxwell方程组进行了求解。将光纤截面作为超元胞衍生出一个无边界的二维周期性系统,光纤纤芯等效为光子晶体中的缺陷,借助平面波法对其性质进行研究,模拟了半导体中的超格子。运用上述超格子模型,对与纤芯同列孔半径可变的高双折射及与包层中纤芯距离最近的孔半径可变的色散平坦光子晶体光纤的光学性质进行了研究,发现与纤芯同列的孔半径变化时,其双折射比传统光纤更强,而当包层中距离纤芯最近的孔半径取特定值时,可得到近零色散平坦光纤并在大范围内获得反常色散。与传统光纤和普通光子晶体光纤相比,这种新型的色散平坦光纤在密集波分复用(DWDM)光通信系统中具有更高的应用价值。 相似文献
9.
Khurram Karim Qureshi 《中国光学快报(英文版)》2014,12(2):20605-29
A simple configuration for the generation of a switchable dual-wavelength fiber ring laser is presented.The proposed configuration employs a short twin-core photonic crystal fiber acting as a Mach–Zehnder interferometer at room temperature.A polarization controller is further utilized to enable switchable dualwavelength operation. 相似文献
10.
Design of photonic crystal fiber with elliptical air-holes to achieve simultaneous high birefringence and nonlinearity 下载免费PDF全文
A new type of V-shaped photonic crystal fiber with elliptical air-holes is proposed to realize simultaneous high birefringence and nonlinearity at a wavelength of 1.55μm.The full vector finite element method was adopted to investigate its characteristics,including birefringence,nonlinearity,and dispersion.The PCF exhibited a very high birefringence of 2.89×10~(-2) and very high nonlinear coefficient of 102.69 W~(-1)·km~(-1).In particular,there were two zero-dispersion wavelengths(ZDWs)in the visible(X:640-720 nm and Y:730-760 nm)and near-infrared regions(X:1050-1606 nm and Y:850-1500 nm).The combination of high birefringence and nonlinearity allowed the PCF to maintain the polarization state and generate a broadband super continuum,with potential applications in nonlinear optics. 相似文献
11.
Jibon Rayhan Habib Bulbul Abdullah Al-Mamun Nahid Abdullah-Al Faragallah Osama S. Baz Mohammed Eid Mahmoud M. A. Rashed Ahmed Nabih Zaki 《Optical Review》2021,28(5):564-572
Optical Review - We present the modeling of a porous core dispersion flatten photonic crystal fiber (PCF) for the fruitful transmission of THz signals. The model comprises only rectangular holes in... 相似文献
12.
A novel high birefringence polymer photonic crystal fiber (PCF) is proposed in this work. This PCF is composed of a polymer core and a cladding with elliptical air holes and squeezed triangular lattice. The high birefringence is introduced on the combined effect of elliptical air holes and the squeezed lattice. Our numerical results based on the supercell lattice method indicate that the birefringence can reach as high as 0.0018 at 650 nm wavelength with a properly designed cladding structure. We also analyze the dependence of the birefringence on structure parameters. And we design a PCF that has high and flattened birefringence. 相似文献
13.
We construct a dimethylsulfoxide(DMSO)-based photonic crystal fiber(PCF) temperature sensor with enhanced sensitivity.A solid-core PCF with large mode area is employed to supply the in-line Mach– Zehnder interference between the fundamental and cladding modes.Thus,temperature sensing can be realized because of the shift of interference spectrum at different temperatures.The DMSO solvent is infiltrated between the main sensor and a silica tube to increase the temperature sensitivity of the sensor.The obtained sensitivity(0.315 nm/ffC) is one or two orders of magnitude higher than that of previously published results.The proposed sensor is adapted for high-temperature sensing. 相似文献
14.
15.
Nguyen Hoang Hai Yoshinori Namihira Shubi F. Kaijage Tatsuya Kinjo Feroza Begum S. M. Abdur Razzak Nianyu Zou 《Optical Review》2008,15(2):91-96
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. 相似文献
16.
The slow light and group velocity dispersion properties of 2D triangular lattice photonic crystal line defect waveguide (PCW) with square and circular air-holes are numerically investigated with the plane-wave expansion method. The simulation results show that the guided mode is impacted slightly by the cross section’s shape of the air-holes of the same filling ratio. Adjusting two rows of the inner-hole adjacent to the waveguide and modifying the waveguide width can bring in low-group velocity and low-dispersion (LVLD) region, in which the group index of the square holes can reach 210 which is far better than the circular-holes. At the same air-hole size and waveguide width, the PCW with the square holes can support higher bit rate of the signal up to 35 Gb/s. These results provide important theoretical basis for realizing of optical buffering and optical logic devices in all-optical network. 相似文献
17.
A novel kind of large mode area photonic crystal fibers (PCFs) are proposed in this paper. In order to achieve large effective mode area, a novel technique is applied to seven missing air hole PCF structures. The modal characteristics of PCF structures such as effective mode area, confinement loss, chromatic dispersion properties with doped cores, are investigated by employing the full vectorial finite element method (FEM). Simulation results demonstrate that effective mode area and confinement losses of fundamental mode simultaneously improved by applying our novel technique to proposed structures. The effects of bending on confinement losses of the proposed PCFs have been thoroughly investigated. Additionally, confinement losses of first higher order modes are presented and the possibility of stripping them in a simple way is discussed. 相似文献
18.
Lihong Han Liming Liu Zhongyuan Yu Huijie Zhao Xin Song Jinhong Mu Xiu Wu Junjie Long Xi Liu 《中国光学快报(英文版)》2014,12(1):10603
The dispersion compensation properties of dual-concentric core photonic crystal fibers are theoretically investigated in this letter.The effects of geometric structure on the dispersion properties of dual-concentric core photonic crystal fibers are carefully studied by finite element method.The first layer of holes around the core area is enlarged in a new manner with the near-core point fixed.Considering the tradeoff among several parameters,results show that the dispersion compensation wavelength and strength can be tuned to desired values by constructing an appropriate design of the geometric structure of photonic crystal fibers. 相似文献
19.
20.