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色散渐减光纤(DDF)和3dB光纤耦合器构成的非线性光纤环镜(DDF-NOLM)具有无基座脉冲压缩的效应,给出了达到最佳脉冲压缩效应的物理条件。结果表明:光纤环的最佳长度主要由入射脉冲的孤子阶数决定。在光纤环中反向传输两脉冲的压缩效果区别越大则脉冲峰值处的相对相位差越接近于0,从而使DDF-NOLM达到脉冲压缩的最佳条件。 相似文献
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The compression of soliton pairs in fibres with decreasing dispersion is studied. The results show that generation of high-quality stable pedestal-free pulses is strongly affected by the interaction between soliton pairs. The initial phase difference between two solitons can modify soliton interaction and can make the neighbouring solitons never collide periodically. The soliton pairs can be compressed selectively so that one of the two solitons can achieve enhanced compression by controlling the initial phase difference. 相似文献
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Modulational instability of incoherently coupled beams in azobenzene-containing polymer with photoisomerization nonlinearity 下载免费PDF全文
The modulational instability of two incoherently coupled beams in
azobenzene-containing polymer with photoisomerization nonlinearity
is investigated analytically and numerically. Our results show that
as a precursor to spatial optical soliton formation, modulational
instability can be adjusted and controlled by the wavelength
combinations of the signal and background beams. We also discuss the
dependences of strength of modulational instability on intensities
of two signal beams and background beam. These findings make it
possible to predict the formation of incoherently coupled soliton
pairs in azobenzene-containing polymer. 相似文献
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从频域全场方程出发研究了色散平坦渐减光纤中超连续谱(SC)的产生。结果表明,色散平坦渐减光纤的初始色散和色散斜率对超连续谱的产生有重要影响,当超连续谱宽度小于某一特定阈值时,谱宽随初始色散或色散斜率显著变化;而当超连续谱谱宽大于此值以后,谱宽随这两个参量的变化较缓慢。并且发现色散递减曲线为凸型的光纤比色散线性递减的光纤更有利于产生宽的超连续谱;而色散递减曲线为凹型的光纤不利于形成宽的超连续谱。计算表明经过优化选择光纤的色散参量,可以得到谱宽达330nm的超连续谱。 相似文献
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Characteristics of optical switching in a twin-core fibre coupler are numerically analysed under short pulse input by using supermode theory. The dynamic nonlinear coupled superlnode equations are derived, The numerical results show that the input pulse width determines the power transfer and the pulse temporal profile in the output ports. The optimal switching characteristics can be obtained by selecting an appropriate initial pulse width. In addition, the switching characteristic curves are insensitive to the input pulse shape for either fundamental soliton pulse or Gaussian pulse input, but sensitive to pulse sharpness. A reduced switching power and a sharper switching transition can be obtained by using the sharp super-Gaussian pulse. 相似文献
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色散平坦渐减光纤中超连续谱的产生 总被引:1,自引:1,他引:1
对双正交偏振光脉冲在色散平坦渐减光纤中传输时超连续谱的产生进行了计算和分析。结果表明,由于交叉相位调制效应的作用,双光脉冲可以产生比单光脉冲明显展宽且更为平坦的超连续谱。对于双基孤子脉冲,可以得到-20dB谱宽达388nm的平坦宽带超连续谱,比单基孤子脉冲产生的超连续谱谱宽增加72nm,交叉相位调制效应对超连续谱的产生起到增强的效果。当输入脉冲的抽运功率较低时,交叉相位调制效应对超连续谱的产生的增强效果更为显著,它极大地提高了超连续谱的产生的效率。数值计算的结果还表明,与其他高阶非线性效应相比,拉曼自频率移效应对超连续谱产生的影响更为明显。 相似文献