共查询到19条相似文献,搜索用时 125 毫秒
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孤子源啁啾对光孤子传输的影响以及消啁啾的方法 总被引:2,自引:0,他引:2
本文提出了一种孤子源非线性啁啾的模型,利用解析和计算机模拟的方法从理论上分析了孤子源啁啾,特别是非线性啁啾对孤子传输的影响,并讨论了消啁啾的两种方法-正色散光纤消啁啾法和Fabry-Perot光谱窗消啁啾法,实验结果与理论分析基本一致. 相似文献
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以获得光参量啁啾脉冲放大系统主激光与抽运光两种波长、宽带、超短脉冲的产生及精密同步为目标,探索采用光孤子机制实现超宽带宽范围的可调谐超短脉冲产生. 数值模拟了孤子传输过程中的时域-频域演化过程及与其他非线性效应的相互作用过程和特性. 实验验证了利用光孤子机制产生可调谐脉冲的方法. 同时还观察到孤子的形成、分裂、自频移等现象,在可见光到近红外波段都演示了波长可调谐的输出特性,并且与理论分析结果符合较好.
关键词:
光参量啁啾脉冲放大
可调谐脉冲产生
非线性薛定谔方程
孤子机制 相似文献
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提出了一种处理玻色-爱因斯坦凝聚啁啾孤子动力学的拓展变分方法,深入研究了玻色-爱因斯坦凝聚孤子在周期势与抛物势联合作用下的动力学演化,利用拓展变分法给出了解析处理,并和基于分步傅里叶变换的直接数值法进行比较,发现这种拓展变分方法能够充分揭示上述外势场中的玻色-爱因斯坦凝聚啁啾孤子的动力学行为和特征.同时给出了能支持多稳定晶格囚禁玻色-爱因斯坦凝聚啁啾孤子的周期势与抛物势强度比值的临界值和一种通过控制外势场可有选择地移动玻色-爱因斯坦凝聚啁啾孤子的操控方法,这为玻色-爱因斯坦凝聚的实验和应用研究提供了理论参
关键词:
玻色-爱因斯坦凝聚
Gross-Pitaevskii方程
啁啾孤子
操控 相似文献
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提出采用凸形色散平坦光纤(DFF-CVDP)传输亚皮秒啁啾孤子,利用分步傅里叶方法数值研究了亚皮秒啁啾孤子在DFF-CVDP中的传输特性,并与在线性色散平坦光纤(DFF-LDP)中的传输特性做了比较。结果表明,孤子脉冲在上述两种光纤中传输时,光纤损耗导致了孤子脉冲宽度随传输距离增加稍有展宽,脉冲方均根谱宽随传输距离增加逐渐减小。在DFF-LDP中,脉冲展宽更快,正啁啾对脉冲展宽的影响比负啁啾的影响更大,正啁啾对应的方均根光谱比其他情况下的宽得多。啁啾脉冲时域宽度随传输距离增加出现了衰减振荡,振荡周期和振幅随啁啾参量|C|的增加而增大。光孤子脉冲在两种光纤中传输时域波形保持不变,仍具有孤子特性。在DFF-LDP中,3β使得脉冲光谱红移从而诱导了脉冲时延,负啁啾减弱了3β的作用,正啁啾加强了β3的影响。在DFF-CVDP中传输可以忽略3β的影响。 相似文献
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利用分步傅里叶方法,对随机双折射光纤孤子传输进行了数值模拟,研究了多孤子间相互作用;分析了随机双折射现象对孤子传输的扰动机制、稳定性以及辐射能量特性.结果表明:随机双折射引起孤子传输不稳定,增强了孤子间相互作用,导致孤子能量辐射并随传输距离增大.引进非线性增益增强滤波器的控制作用可以有效地抑制随机双折射的对孤子相互作用的影响. 相似文献
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对准光孤子理论进行了研究,用一个合适的、持续的色散管理方法,从一个修正的非线性薛定谔方程得到一个精确解,用这个解构造一个非线性稳定的准光孤子脉冲。用数值模拟的方法得出了准光孤子和光孤子的波形。结果表明:准光孤子几乎具有光孤子的全部优点,其脉冲宽度比光孤子要小很多,并且准光孤子的脉冲宽度可以通过调节光纤的结构参数来进行调整,准孤子能够在光纤中稳定地实现长距离传输,而且能够很好地克服由孤子的固有特性造成的对通信容量的限制,所以准光孤子有望成为下一代通信系统的最佳信号载体。 相似文献
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《Physics letters. A》2005,342(3):228-236
A realistic, inhomogeneous fiber in the optical communication systems can be described by the perturbed nonlinear Schrödinger model (also named as the normalized nonlinear Schrödinger model with periodically varying coefficients, dispersion managed nonlinear Schrödinger model or nonlinear Schrödinger model with variable coefficients). Hereby, we extend to this model a direct method, perform symbolic computation and obtain two families of the exact, analytic bright-solitonic solutions, with or without the chirp respectively. The parameters addressed include the shape of the bright soliton, soliton amplitude, inverse width of the soliton, chirp, frequency, center of the soliton and center of the phase of the soliton. Of optical and physical interests, we discuss some previously-published special cases of our solutions. Those solutions could help the future studies on the optical communication systems. 相似文献
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We investigate the propagation dynamics of nonlinear chirped optical laser pulses in a two-level medium. For certain chirp strength and chirp width, an incident 2π nonlinear chirped pulse will split into optical precursors and a stable self-induced transparency soliton. This is caused by the particular Fourier spectrum that includes not only central resonant frequency components but also high-frequency and low-frequency sidebands. Moreover, the effects of chirp parameters on the evolution of nonlinear chirped pulses are also discussed. 相似文献
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In this paper, 10 Gbps optical soliton transmission link using in-line semiconductor optical amplifiers (SOAs) for already installed standard single mode fibers (SMF) at 1.3 μm wavelength has been reported. The pattern effect and the impact of chirp on pulse propagation after amplification have been investigated. The observations are based on modeling and simulation optical soliton transmission link. Optical soliton pulse transmission over distances of the order of several hundreds of kilometers has been shown with and without initial chirp. 相似文献
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利用解析和数值方法研究了在具有横向折射率周期性调制的克尔型非线性介质中光学格子孤子的传输,得到了孤子参数的演化方程以及格子孤子的形成和稳定传输的条件.结果表明:当光束的入射角小于某临界角度时,光束可被类似波导形式的路径俘获而稳定传输,该临界角随折射率调制周期、调制深度的增加而增大,且光束越窄临界值越大.此外,线性空间啁啾虽然对光束传输的中心位置没有任何影响,但会导致光束发散从而破坏格子孤子的形成和稳定传输,对此提出了采用特定功率取值来补偿啁啾作用从而形成格子孤子的方案.
关键词:
光孤子
光学格子
光传输
矩方法 相似文献
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Quasi-soliton propagation in dispersion-managed optical fibers 总被引:3,自引:0,他引:3
Combination of programmed chirp and dispersion profiles produced a solitonlike nonlinear pulse with a stationary structure (quasi-soliton). The quasi-soliton has more attractive properties than those of a soliton because of its reduced interaction and smaller peak power than a soliton and allows ~100-Gbit / s transmission over a 125-dispersion distance with reasonable power. 相似文献
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Propagation characteristics of a polarized optical solitary pulse are analyzed by taking into account the effect of nonparaxiality and mutual interaction. To start with, a pair of generalized nonlinear Schrodinger equations is deduced through an operator approach. Stationary solutions of such a system are then analyzed numerically through a boundary value problem in two stages, with and without the nonparaxial effect. In the second stage, the propagating form of the corresponding spatial soliton is studied by an extended split step algorithm ETDRK. The initial profile is considered to be both a one- and two-soliton solution, to visualize the event of scattering and fusion. From this data, we have computed the intensity, root mean square spectral width, and chirp of a single soliton as it propagates. In the case of the two-soliton solution, we observe that for source parameter values, the fusion is more favored than scattering. It is observed that nonparaxiality and the interaction between A(x) and A(y) tends to destroy the periodic behaviors of these parameters. Lastly, we have investigated the modulational instability of the system as function of frequency detuning and nonparaxiality. The form of the gain is discussed as a function of nonparaxiality. 相似文献
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5GHz的16.2ps超短光脉冲的产生 总被引:5,自引:2,他引:3
对采用法布里-珀罗腔和正常色散光纤联合消啁啾进行了理论和实验上的研究,实验得到啁啾小于孤子形成临界值,重复频率为5GHz、脉宽为16.2ps的超短光脉冲,并对消啁呼后的超短光脉冲进行了孤子传输实施。 相似文献