Wave breaking in tapered holey fibers |
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Authors: | Shuguang Li Lei Zhang Bo Fu Yi Zheng Ying Han Xingtao Zhao Key Laboratory of Metastable Materials Science Technology College of Science Yanshan University Qinhuangdao China School of Science Beijing Jiaotong University Beijing China |
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Institution: | Shuguang Li 1,2,Lei Zhang 1,Bo Fu1,Yi Zheng 2,Ying Han 1,and Xingtao Zhao 1,2 1Key Laboratory of Metastable Materials Science and Technology,College of Science,Yanshan University,Qinhuangdao 066004,China 2School of Science,Beijing Jiaotong University,Beijing 100044,China |
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Abstract: | We numerically study the propagation of 1-ps laser pulse in three tapered holey fibers (THFs).The curvature indices of the concave,linear,and convex tapers are 2.0,1.0,and 0.5,respectively.The central wavelength,located in the normal dispersion regime,is 800 nm.The nonlinear coefficient of the THFs increases from the initial 0.095 m-1· W-1 to the final 0.349 m-1·W-1.Wave breaking accompanied by oscillatory structures occurs near pulse edges,and sidelobes appear in the pulse spectrum.With the increase in propagation distance z,the pulse shape becomes broader and the pulse spectrum flattens.A concave THF is advantageous to the generation of wave breaking and enables easier achievement of super flat spectra at short lengths. |
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