光子晶体光纤中双脉冲非线性传输的数值分析

J4 ›› 2011, Vol. 28 ›› Issue (4): 467-472.

光子晶体光纤中双脉冲非线性传输的数值分析

赵荣霞¹,李爱萍^1,2

1 滨州学院物理与电子科学系，山东滨州，256603；
2 滨州学院理论物理研究所，山东滨州，256603

收稿日期:2010-12-02 修回日期:2010-12-30 出版日期:2011-07-28 发布日期:2011-07-06
通讯作者: 赵荣霞（1980-），女，山东滨州人，硕士，助教，主要从事宇宙线物理和光子晶体光纤非线性特性及应用研究。 E-mail:zhaorxbzxy@163.com
基金资助:
国家自然科学基金重点项目（60637010）、滨州学院科研基金资助项目（Bzxykj0812）

Numerical analysis of nonlinear co-propagation of two optical pulses in photonic crystal fibers

ZHAO Rongxia¹, LI Aiping^1,2

1 Department of Physics and Electronics，Binzhou University, Binzhou 256603, China；
2 Institute for Theoretical Physics, Binzhou University, Binzhou 256603, China

Received:2010-12-02 Revised:2010-12-30 Published:2011-07-28 Online:2011-07-06

摘要/Abstract

摘要：

采用分布傅立叶方法数值求解耦合的非线性薛定谔方程，模拟了双脉冲在光子晶体光纤中的非线性传输过程，计算和分析了离散效应和脉冲内拉曼散射对信号脉冲传输和压缩的影响。结果表明，当中心波长为800nm的泵浦脉冲在反常色散区进行泵浦，而中心波长为740nm的信号脉冲在正常色散区入射，在群速度色散，自相位调制及交叉相位调制联合作用下，信号脉冲在传输过程中不仅被压缩且存在最佳光纤长度。离散效应不仅导致脉冲压缩比的减小和压缩后峰值功率的降低，而且导致脉冲所需最佳光纤长度的增加以及压缩后的脉冲呈现不对称，还发现，脉冲内拉曼散射有利于改善脉冲压缩质量。

关键词: 非线性光学, 光子晶体光纤, 分布傅里叶法, 交叉相位调制, 离散效应, 拉曼效应

Abstract:

Using a standard split-step Fourier method, the coupled nonlinear Schrodinger equations were numerically solved. A theoretical investigation on the nonlinear propagation of two optical pulses in a photonic crystal fiber was presented. The role of pulse walk off and intra-pulse stimulated Raman scattering on the propagation and compression of the signal pulse was highlighted. It was found that the signal pulse can be compressed through the cooperation by group velocity dispersion, self-phase modulation and cross-phase modulation, when the pump pulse with a wavelength of 800nm is input in the anomalous dispersion region while the signal pulse with a wavelength of 740nm is input in the normal dispersion region. Pulse walk-off not only leads to the degradation of the compression ratio and compressed peak power of the signal pulse but also leads to a longer fiber length at which the width of the compressed signal pulse is minimum, and leads to the non-symmetry of the compressed signal pulse. It was also found that the quality factor of the signal pulse can be improved in the presence of intra-pulse stimulated Raman scattering.

Key words: nonlinear optics, photonic crystal fiber, split-step Fourier method, cross-phase modulation, pulse walk-off, intra-pulse stimulated Raman scattering

中图分类号:

TN929.11

赵荣霞李爱萍. 光子晶体光纤中双脉冲非线性传输的数值分析[J]. J4, 2011, 28(4): 467-472.

ZHAO Rongxia, LI Aiping. Numerical analysis of nonlinear co-propagation of two optical pulses in photonic crystal fibers[J]. J4, 2011, 28(4): 467-472.

参考文献

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