共查询到20条相似文献,搜索用时 15 毫秒
1.
具有周期非均匀扰动的色散管理系统中的孤子传输 总被引:5,自引:1,他引:4
在准理想的色散管理系统中建立了非均匀扰动模型,研究了它们对孤子传输和相互作用的影响.这些扰动导致孤子崩塌,加剧了孤子间相互作用.它们影响的大小与周期长度和扰动强度有关,并且存在最坏周期长度和扰动共振现像.最后,引入非线性增益和滤波器来有效控制这些扰动的影响. 相似文献
2.
Correlated perturbations are considered in a dark soliton system, and their effects on soliton propagation and interaction are investigated numerically. These perturbations result in large sidebands, lead to submergence of dark soliton, and enhance the interaction. The correlation amplifies these effects and shortens the distance until submergence. The comparison of the distinction is made between the degradations of these effects on dark soliton and the corresponding bright soliton. It is found that these effects on dark soliton are less than those on bright soliton. Finally the nonlinear gain is introduced to suppress efficiently these effects. 相似文献
3.
Correlation between randomly varying birefringence and random dispersion map in a dispersion-managed soliton system 下载免费PDF全文
The correlation between perturbations caused by randomly varying birefringence and a random dispersion map is considered in a dispersion-managed soliton system, and their effects on soliton propagation and interaction are investigated numerically. These perturbations lead to the disintegration of a soliton, and enhance the interaction between solitons. The correlation plays an important role, and reinforces these effects. Furthermore, there is a stochastic resonance between two perturbations in the system; here the effect is the largest, and the corresponding distance until disintegration is the shortest. Finally, nonlinear gain and a filter are introduced to effectively suppress these effects. 相似文献
4.
基于含扰动的非线性薛定谔方程,发展了高登的光孤子相互作用理论,直接从近似的二孤子解昨到描述实际光纤通讯中孤子间的相互作用的解析公式,公式表明在实际的通讯系统中光纤孤子间的相互作用不令依赖于它们之间相对相差,而且依赖于它们的相对能量,速度差随传输距离的变化。 相似文献
5.
We consider the Euler equations describing nonlinear waves on the free surface of a two-dimensional inviscid, irrotational
fluid layer of finite depth. For large surface tension, Bond number larger than 1/3, and Froude number close to 1, the system
possesses a one-parameter family of small-amplitude, traveling solitary wave solutions. We show that these solitary waves
are spectrally stable with respect to perturbations of finite wave-number. In particular, we exclude possible unstable eigenvalues
of the linearization at the soliton in the long-wavelength regime, corresponding to small frequency, and unstable eigenvalues
with finite but bounded frequency, arising from non-adiabatic interaction of the infinite-wavelength soliton with finite-wavelength
perturbations.
Received: 7 February 2001 / Accepted: 6 October 2001 相似文献
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8.
Effects of Periodically Inhomogeneous Birefringence on Dark-Bright Vector Soliton Propagation and Interaction 下载免费PDF全文
The effects of periodically inhomogeneous birefringence on dark-bright vector soliton propagation and interaction are investigated by the numerical method. The birefringence leads to the submergence of the dark soliton and the disintegration of the bright soliton, and enhances the interaction between the neighbouring solitons. The system performance is determined by the bright soliton because the dark soliton has robust features. Finally, the avoidance and the effective control are introduced, and the controlling mechanism is demonstrated. 相似文献
9.
The soliton perturbations of the modified Korteweg de Vries equation corresponding to different signs of the nonlinear term are studied. The first-order effects of perturbation on a soliton, namely, both the slow time-dependence of the soliton parameters and first-order corrections are derived in a direct approach based on the separation of variables. 相似文献
10.
J. Garnier 《Journal of statistical physics》2001,105(5-6):789-833
This paper deals with the transmission of a soliton in a random medium described by a randomly perturbed Korteweg–de Vries equation. Different kinds of perturbations are addressed, depending on their specific time or position dependences, with or without damping. We derive effective evolution equations for the soliton parameter by applying a perturbation theory of the inverse scattering transform and limit theorems of stochastic calculus. Original results are derived that are very different compared to a randomly perturbed Nonlinear Schrödinger equation. First the emission of a soliton gas is proved to be a very general feature. Second some perturbations are shown to involve a speeding-up of the soliton, instead of the decay that is usually observed in random media. 相似文献
11.
Multi-hump soliton which consists of plural pulses can propagate in a dispersion-managed optical fiber transmission system
with maintaining the pulse-to-pulse spacings. In this paper, the family members of multi-hump soliton are systematically introduced
using a family tree. The system parameter ranges in which multi-hump soliton can exist are studied by a numerical averaging
scheme. The dependency of pulse energy and pulse-to-pulse spacing on the system parameter is also investigated to show the
robustness of anti-phase bi-soliton against imposed perturbations. 相似文献
12.
The lifetime of the soliton in the improved Davydov model at the biological temperature 300 K for protein molecules 总被引:7,自引:0,他引:7
Pang Xiao-feng 《The European Physical Journal B - Condensed Matter and Complex Systems》2001,19(2):297-316
We study the effects of quantum fluctuations and thermal perturbations on the lifetime of the soliton in the improved Davydov
model proposed by us with two-quanta and with an added interaction. By using quantum perturbation theory, we compute the soliton
lifetime for a wide ranges of parameter values relevant for protein molecules. The lifetime of the new soliton at the biological
temperature 300 K is of the order of 10-10 second or τ/τ≥ 500 for parameters appropriate to α-helical protein molecules. This shows clearly that the new soliton in the improved model
is a viable mechanism for the bio-energy transport in the α-helix region of proteins.
Received 7 January 1999 and Received in final form 16 August 2000 相似文献
13.
Collision of optical solitons with Kerr law nonlinearity 总被引:1,自引:0,他引:1
The intra-channel collision of optical solitons, with Kerr law nonlinearity, is studied by the aid of quasi-particle theory. The perturbation terms considered in this paper are all of Hamiltonian type. It is shown that the soliton–soliton interaction can be suppressed in the presence of these perturbations, namely, the self-steepening, the third-order dispersion, the fourth-order dispersion and the frequency separation between the soliton carrier and the gain-center frequency. The prediction of quasi-particle theory are fully confirmed by direct numerical simulations. 相似文献
14.
DUAN Wen-Shan CHEN Jian-Hong HONG Xue-Ren WAN Gui-Xin 《理论物理通讯》2007,47(1):149-154
A modified Zakharov-Kuznetsov equation for small but finite dustic waces in a magnetized votex-like ion distribution dusty plasma is obtained in this paper.It seems that there are instability for a soliton under higher-order transverse perturbations in this system. There is a certain critical value 4λ0. If the ratio of the wave length of the higher-order perturbations to the width of the soliton is larger than this critical value, the solitary wave is unstable, otherwise it is stable. 相似文献
15.
Piscureanu M Manaila-Maximean D 《Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics》2000,61(1):880-885
We studied the optical solitons in nonlinear resonant and nonresonant media in the presence of perturbations, assuming that the transient effects are stimulated by the light scanning beam. We treated a slight deviation from the exact necessary condition for the soliton existence (2betanu=1), as a small perturbation for the integrable system, studying its influence upon the soliton propagation conditions. The approximation is constructed by the help of an algebraic version of the soliton perturbation theory using a Riemann boundary problem in connection with the inverse scattering method. We have obtained the soliton equation and we have solved it in the presence of a small perturbation in the adiabatic approximation. In this case we have demonstrated that for a Lorentz profile line the amplitude of the soliton remains unchanged, the only effect of the perturbation results in a phase shift. 相似文献
16.
S. V. Sazonov 《Journal of Experimental and Theoretical Physics》2006,103(1):126-140
An averaged variational principle is applied to analyze the nonlinear effect of transverse perturbations (including diffraction) on quasi-one-dimensional soliton propagation governed by various wave equations. It is shown that parameters of the spatiotemporal solitons described by the cubic Schrödinger equation and the Yajima-Oikawa model of interaction between long-and short-wavelength waves satisfy the spatial quintic nonlinear Schrödinger equation for a complex-valued function composed of the amplitude and eikonal of the soliton. Three-dimensional solutions are found for two-component “bullets” having long-and short-wavelength components. Vortex and hole-vortex structures are found for envelope solitons and for two-component solitons in the regime of resonant long/short-wave coupling. Weakly nonlinear behavior of transverse perturbations of one-dimensional soliton solutions in a self-defocusing medium is described by the Kadomtsev-Petviashvili equation. The corresponding rationally localized “lump” solutions can be considered as secondary solitons propagating along the phase fronts of the primary solitons. This conclusion holds for primary solitons described by a broad class of nonlinear wave equations. 相似文献
17.
Holographic solitons in photorefractive dissipative systems 总被引:1,自引:0,他引:1
Liu J 《Optics letters》2003,28(22):2237-2239
A new kind of holographic soliton is proposed for a photorefractive dissipative system consisting of a biased photorefractive crystal and a strong pump beam with a uniform spatial distribution in both transverse dimensions. The self-trapping beam in the system can evolve into a spatial soliton when it couples coherently with the pump beam by two-wave mixing. Unlike the holographic solitons recently proposed by Cohen et al. [Opt. Lett. 27, 2031 (2002)], the most unique features of the present solitons are that they have a fixed amplitude and width that are determined completely by the system parameters and that their existence conditions are independent of the polarity of the bias field. Numerical simulations show that these solitons are stable relative to small perturbations. 相似文献
18.
We respectively investigate breakup and switching of the Manakov-typed bound vector solitons (BVSs) induced by two types of stochastic perturbations: the homogenous and nonhomogenous. Symmetry-recovering is discovered for the asymmetrical homogenous case, while soliton switching is found to relate with the perturbation amplitude and soliton coherence. Simulations show that soliton switching in the circularly-polarized light system is much weaker than that in the Manakov and linearly-polarized systems. In addition, the homogenous perturbations can enhance the soliton switching in both of the Manakov and non-integrable (linearly- and circularly-polarized) systems. Our results might be helpful in interpreting dynamics of the BVSs with stochastic noises in nonlinear optics or with stochastic quantum fluctuations in Bose–Einstein condensates. 相似文献
19.
A direct approach has been developed for soliton perturbations based on the Green's function. We first linearized the soliton equation, and then derived the Green's function corresponding to approximation equations of different orders. Finally, we obtained the effects of perturbation on a soliton, namely both the slow time dependence of the soliton parameters and the corrections up to the second-order approximation. The higher-order effects can also be obtained in the same way. 相似文献
20.
Ming Xu Xueming Liu Ju Cai Xianglin Yang Yu Hu 《International Journal of Infrared and Millimeter Waves》2001,22(9):1361-1369
In this paper, the three allocated schemes of dispersion-managed soliton are proposed on standard single-mode fiber. Adopting variational method and on the proposed schemes, the timing jitter introduced from the perturbations of amplifier spontaneous-emission (ASE) and cross-phase modulation in wavelength-division multiplexing is studied. Compared with performances of different system schemes, the principles of optimal allocated dispersion management are obtained, which can be used to optimal allocated dispersion managed soliton system. 相似文献