| 单模光纤零色散波长附近的调制不稳定性──考虑高阶非线性效应(英文) |
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| 引用本文： | 文双春,曾锡滨.单模光纤零色散波长附近的调制不稳定性──考虑高阶非线性效应(英文)[J].衡阳师范学院学报,1997(3). |
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| 作者姓名： | 文双春 曾锡滨 |
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| 作者单位： | 衡阳师范高等专科学校物理系!衡阳，421008 |
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| 摘 要： | 利用修正的非线性Schrodinger方程研究了单模光纤中零色散波长附近飞秒光脉冲的调制不稳定性，发现了一个新的由光纤四阶色散导致的调制不稳定区域，新区域的最大调制增长率和调制范围与光脉冲的初始入射功率和四阶色散有关．光纤自陡峭效应和Raman延迟效应对两个调制不稳定区域的最大调制增长率和调制范围都有影响，自陡峭效应对新区域的影响较大且存在一个决定新区域出现与否的阈值；Raman延迟效应对调制不稳定性的影响比自陡峭效应显著，尤其当Raman延迟效应较强对，它使两个区域合并成一个具有更大调制范围的调制不稳定区域。
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| 关 键 词： | 单模光纤 零色散 调制不稳定性 |
MODULATIONAL INSTABILITY NEAR ZERO-DISPERSION POINT IN MONOMODE FIBERS:INCLUDING HIGHER-ORDER NONLINEARITIES |
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| Wen Shuangchun,Zeng Xibin.MODULATIONAL INSTABILITY NEAR ZERO-DISPERSION POINT IN MONOMODE FIBERS:INCLUDING HIGHER-ORDER NONLINEARITIES[J].journal of Hengyang Normal University,1997(3). |
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| Authors: | Wen Shuangchun Zeng Xibin |
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| Abstract: | Modulational instability of femtosecond optical pulses in fibers near zero-dispersion point is investigated using an extended Schrodinger equation and a new region where modulation instability occurs is found due to the fourth-order dispersion. It is shown that there exists a threshold for self-steeping in af fecting the appearance of the new region,Raman nonlinear retarded effect has a greater influence on growth rate and spectral extents of the two unstable regions and can make the two regions merge into one region which has a wider spectral extent. |
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| Keywords: | modulational instability monomode optical fiber zero-dispersion point |
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