中国物理B ›› 2010, Vol. 19 ›› Issue (6): 64212-064212.doi: 10.1088/1674-1056/19/6/064212

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Cross-phase modulation instability in optical fibres with exponential saturable nonlinearity and high-order dispersion

钟先琼, 向安平   

  1. College of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, China
  • 收稿日期:2009-07-16 出版日期:2010-06-15 发布日期:2010-06-15
  • 基金资助:
    Project supported by the Key Program of the Natural Science Foundation of Sichuan Provincial Education Department (Grant No.~2006A124) and the Fundamental Application Research Project of the Department of Science \& Technology of Sichuan Province (Grant N

Cross-phase modulation instability in optical fibres with exponential saturable nonlinearity and high-order dispersion

Zhong Xian-Qiong(钟先琼) and Xiang An-Ping(向安平)   

  1. College of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, China
  • Received:2009-07-16 Online:2010-06-15 Published:2010-06-15
  • Supported by:
    Project supported by the Key Program of the Natural Science Foundation of Sichuan Provincial Education Department (Grant No.~2006A124) and the Fundamental Application Research Project of the Department of Science \& Technology of Sichuan Province (Grant N

摘要: Utilizing the linear-stability analysis, this paper analytically investigates and calculates the condition and gain spectra of cross-phase modulation instability in optical fibres in the case of exponential saturable nonlinearity and high-order dispersion. The results show that, the modulation instability characteristics here are similar to those of conventional saturable nonlinearity and Kerr nonlinearity. That is to say, when the fourth-order dispersion has the same sign as that of the second-order one, a new gain spectral region called the second one which is far away from the zero point may appear. The existence of the exponential saturable nonlinearity will make the spectral width as well as the peak gain of every spectral region increase with the input powers before decrease. Namely, for every spectral regime, this may lead to a unique value of peak gain and spectral width for two different input powers. In comparison with the case of conventional saturable nonlinearity, however, when the other parameters are the same, the variations of the spectral width and the peak gain with the input powers will be faster in case of exponential saturable nonlinearity.

Abstract: Utilizing the linear-stability analysis, this paper analytically investigates and calculates the condition and gain spectra of cross-phase modulation instability in optical fibres in the case of exponential saturable nonlinearity and high-order dispersion. The results show that, the modulation instability characteristics here are similar to those of conventional saturable nonlinearity and Kerr nonlinearity. That is to say, when the fourth-order dispersion has the same sign as that of the second-order one, a new gain spectral region called the second one which is far away from the zero point may appear. The existence of the exponential saturable nonlinearity will make the spectral width as well as the peak gain of every spectral region increase with the input powers before decrease. Namely, for every spectral regime, this may lead to a unique value of peak gain and spectral width for two different input powers. In comparison with the case of conventional saturable nonlinearity, however, when the other parameters are the same, the variations of the spectral width and the peak gain with the input powers will be faster in case of exponential saturable nonlinearity.

Key words: nonlinear optics, cross-phase modulation instability, exponential saturable nonlinearity, high-order dispersion

中图分类号:  (Propagation, scattering, and losses; solitons)

  • 42.81.Dp
42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption) 42.65.Hw (Phase conjugation; photorefractive and Kerr effects)