基于高非线性微结构光纤的全光再生研究

All-Optical Regeneration Based on Highly Nonlinear Microstructured Fiber

提出了利用高非线性微结构光纤自相位调制效应进行全光再生的研究方案。分析了一组微结构光纤的色散和非线性特性。结果显示光纤的非线性系数与光纤结构有密切关系。通过减小有效模面积,可以提高光纤的非线性系数。采用一种高空气填充比的高非线性微结构光纤作为非线性介质,进行了基于自相位调制效应的全光再生研究。结果表明,由于微结构光纤的高非线性,采用较短的光纤长度就可以实现较好的再生效果。同时,输入微结构光纤的峰值功率、滤波器的参量选择对光再生的效果有重要的影响,它们必需满足一定要求,才能实现光再生。此外,对再生器的传输特性进行了研究。通过调整输入峰值功率和滤波器的参量,可以对不同宽度的光脉冲信号进行全光再生。

All-optical regeneration based on self-phase modulation in a highly nonlinear microstructured fiber is proposed. The dispersion and nonlinearity properties of a series of microstructured fibers are analyzed and the results show that the nonlinearity coefficient is closely related to the structure of the fiber. The nonlinear coefficient is increased by reducing the effective mode area and a highly nonlinear microstructured fiber with large air-filling ratio is used as the nonlinear medium in optical regeneration. The process of all-optical regeneration based on self-phase modulation in the fiber is investigated. The numerical results show a good optical regeneration result can be obtained by using a relatively short fiber length due to the high nonlinearity of the fiber. The input peak power launched into the microstructured fiber and the parameters of the filter have much influence on optical regeneration. In order to achieve good optical regeneration results, those parameters need to meet certain requirements. Furthermore, the transmission characteristic of the regenerator is also discussed. With adjustable input peak power and filter parameters, the regenerator can deal with the input pulses with different pulse widths.