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四波混频是光纤中常见的非线性效应,其新产生的频率对目标信号进行了全光透明转换,因此,四波混频可以作为光网络物理层中十分隐蔽的窃听手段。文章分析了光纤中四波混频的非线性原理和影响四波混频效率的因素,重点研究了反常色散区域内四波混频产生效率的“双峰”现象,并对零色散波长附近的效率表达式进行了简化,提出了一种计算效率峰值波长的解析表达式。数值计算和仿真结果表明,解析表达式可以有效简化效率峰值波长的计算过程,且计算精度随泵浦功率的降低和色散系数的增加而提高,在窃听和监控领域具有工程化价值。
Four-wave mixing is a common non-linear effect in optical fiber. The newly generated frequency of the target signal undergoes all-optical transparent conversion. Therefore, the four-wave mixing can be used as a very concealed eavesdropping method in the optical network physical layer. The paper analyzes the nonlinear principle of the four-wave mixing in fiber and the factors that affect the efficiency of the four-wave mixing. The “double peak” phenomenon of the four-wave mixing efficiency in the anomalous dispersion area is studied emphatically. The zero dispersion wavelength Near the efficiency of the simplified expression, proposed a calculation of peak efficiency of the analytical expression. The numerical calculation and simulation results show that the analytical expression can effectively simplify the calculation process of the peak wavelength of efficiency, and the calculation precision increases with the decrease of pump power and dispersion coefficient, and has an engineering value in the field of wiretapping and monitoring.