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Switching in three-core nonlinear fiber coupler with second order coupling dispersion coefficient

Li Qi-Liang Xie Yu-Yong Zhu Yin-Fang Zhao Zhi-Jin Wang Tian-Shu Qian Sheng Lin Li-Bin

Switching in three-core nonlinear fiber coupler with second order coupling dispersion coefficient

Li Qi-Liang, Xie Yu-Yong, Zhu Yin-Fang, Zhao Zhi-Jin, Wang Tian-Shu, Qian Sheng, Lin Li-Bin
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  • Received Date:  20 November 2007
  • Accepted Date:  22 February 2008
  • Published Online:  20 September 2008

Switching in three-core nonlinear fiber coupler with second order coupling dispersion coefficient

  • 1. (1)杭州电子科技大学通信工程学院通信与信息系统研究所,杭州 310018; (2)四川大学物理系,成都 610064

Abstract: The propagation and switching of fundamental solitons in three-core fiber nonlinear directional coupler with three cores in an equilateral-triangle arrangement have been investigated with two methods. Firstly, by using variational method, we obtained the equation of transmission coefficient with respect to distance. Secondly, we used the split-step Fourier method (SSFM) to solve the nonlinear Schrdinger equations. The results of both variational method and SSFM indicate that the energy of optical pulses transfer periodically between the three cores and have sharp switching characteristics when the first order intermodal dispersion coefficient is small. Otherwise, the periodicity of the coupling transmission characteristics of optical solitons in fiber coupler and the sharpness of switching are destroyed. The second order intermodal dispersion coefficient and initiative chirp reduce the coupling length, shorten the periods of the energy transfer of optical pulses between the three cores, and increase the threshold switching power. Though the cross phase modulation coefficient has weaker impact on transmission characteristics, it increases the threshold switching power of couplers.

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