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刘宝林 《原子与分子物理学报》2015,32(6):119-124
运用数学解析法导出了关于拉曼增益与自陡峭综合效应的光脉冲传输方程,在此基础上引入洛伦兹模型将拉曼增益整合到非线性系数中来研究光脉冲中拉曼增益对自陡峭效应的作用,重点分析了高斯脉冲在各向同性光纤中传播时,拉曼增益对其自陡峭效应具体影响方式,结果表明拉曼增益会减弱自陡峭中后沿偏移程度,减小脉冲展宽,但不会影响其峰值大小. 相似文献
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LOUSen-Yue 《理论物理通讯》2001,35(5):589-592
Usually,one considers only the group velocity dispersion(GVD)-and self-phase modulation(SPM)-induced solitons in optic soliton communication while other higher order effects such as the third-order dispersion(TOD),self-steepening(SS),and stimulated Raman scattering are considered only perturbatively,In this paper,we study the existence of the TOD-and SS-induced soliton solutions.The existence conditions of the TOD-and SS-induced bright and dark solitons are quite different from those of the GVD-and SPM-induced solitons. 相似文献
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Generation of time-dependent ultra-short optical pulse trains in the presence of self-steepening effect 下载免费PDF全文
Starting from the extended nonlinear Schr?dinger equation in
which the self-steepening effect is included, the evolution and the
splitting processes of continuous optical wave whose amplitude is
perturbed into time related ultra-short optical pulse trains in an
optical fibre are numerically simulated by adopting the split-step
Fourier algorithm. The results show that the self-steepening effect
can cause the characteristic of the pulse trains to vary with time,
which is different from the self-steepening-free case where the
generated pulse trains consist of single pulses which are identical
in width, intensity, and interval, namely when pulses move a certain
distance, they turn into the pulse trains within a certain time
range. Moreover, each single pulse may split into several
sub-pulses. And as time goes on, the number of the sub-pulses will
decrease gradually and the pulse width and the pulse intensity will
change too. With the increase of the self-steepening parameter, the
distance needed to generate time-dependent pulse trains will
shorten. In addition, for a large self-steepening parameter and at
the distance where more sub-pulses appear, the corresponding
frequency spectra of pulse trains are also wider. 相似文献
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直接从异向介质中包含饱和非线性、自陡峭和二阶非线性色散效应的非线性扩展传输方程出发,采用线性稳定性分析法,导出了调制不稳定性的色散关系、不稳定条件、无量纲的临界扰动频率和增益谱。计算和讨论了异向介质正折射区无量纲的增益谱随归一化角频率和入射功率密度的变化关系。结果表明,在异向介质正折射区,随归一化角频率和入射功率密度的不同,增益谱将会出现扰动频率大于零、扰动频率大于某个非零临界值、扰动频率大于零而小于某个非零临界值3种形式。在归一化角频率较小时,调制不稳定性可能出现阈值入射功率密度;且在较小的入射功率密度时,调制不稳定性只能出现在大于某个临界频率时。 相似文献
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Modulation instability (MI) in non-Kerr-like optical fiber near the zero dispersion point is analyzed. Taking into account the fourth order dispersion, new regions of MI are found. The action of the self-steepening is not the same for each region of MI and critical modulation frequency. 相似文献
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Spatiotemporal instability in nonlinear dispersive media is investigated on the basis of the nonlinear envelope equation.
A general expression for instability gain which includes the effects of space-time focusing, arbitrarily higher-order dispersions
and self-steepening is obtained. It is found that, for both normal and anomalous group-velocity dispersions, space-time focusing
may lead to the appearance of new instability regions and influence the original instability gain spectra mainly by shrinking
their regions. The region of the original instability gain spectrum shrinks much more in normal dispersion case than in anomalous
one. In the former case, space-time focusing completely suppresses the growing of higher frequency components. In addition,
we find that all the oddth-order dispersions contribute none to instability, while all the eventh-order dispersions influence
instability region and do not influence the maximum instability gain, therein the fourth-order dispersion plays the same role
as space-time focusing in spatiotemporal instability. The main role played by self-steepening in spatiotemporal instability
is that it reduces the instability gain and exerts much more significant influence on the new instability regions resulting
from space-time focusing. 相似文献
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