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Chin. Phys., 2002, Vol. 11(1): 39-43    DOI: 10.1088/1009-1963/11/1/009
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Modulation instability of femtosecond pulses in fibres with slowly decreasing dispersion

Zhang Shu-Mina, Xu Wen-Chengb, Chen Wei-Chengb, Luo Ai-Pingb, Guo Qib, Liu Song-Haob
a Department of Physics, Hebei Normal University, Shijiazhuang 050091, China; b Institute of Quantum Electronics, South China Normal University, Guangzhou 510631, China
Abstract  In this paper, we investigate the modulation instability for generating femtosecond pulses in fibres with slowly decreasing dispersion. Higher-order dispersion and higher-order nonlinear effects are taken into account when the continuous wave or quasi-continuous wave evolves into sub-picosecond and femtosecond pulses by modulation instability in the optical fibres. Our research results show that the gain spectrum of the dispersion-decreasing fibres is much wider than that in conventional fibres. The third-order dispersion effect has no contribution to gain spectrum, while the self-steepening effect reduces the maximum value and gain bandwidth, and the Raman self-scattering effect widens the extent to which the modulation instability occurs.
Keywords:  modulation instability      ultrashort pulses generation;fibres with slowly decreasing dispersion      third-order dispersion  
Received:  18 April 2001      Revised:  05 September 2001      Published:  12 June 2005
PACS:  42.65.Sf (Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics)  
  42.81.Dp (Propagation, scattering, and losses; solitons)  
  42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)  
Fund: Project supported by the Natural Science Foundation of Guangdong Province, China (Grant No. 980030), and the Natural Science Foundation of the Education Bureau of Guangdong Province, China (Grant No. 200019).

Cite this article: 

Zhang Shu-Min, Xu Wen-Cheng, Chen Wei-Cheng, Luo Ai-Ping, Guo Qi, Liu Song-Hao Modulation instability of femtosecond pulses in fibres with slowly decreasing dispersion 2002 Chin. Phys. 11 39

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