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通过对理想条件下得出的光纤参量放大增益解析解和相位匹配关系表达式进行修正,得出在光纤有损耗 时,小信号峰值增益和光纤非线性系数成正比以及光纤色散参数和峰值增益波长与抽运光波长的差成反比两个近 似表达式。以此为基础提出:只要在直流抽运光作用下测出小信号峰值增益以及增益峰值波长与抽运波长之差, 然后通过简单的代数运算就可以得出光纤的非线性系数和色散参数。实验中,分别用两个不同波长的抽运光,对 一卷长度为1450m的高非线性色散平坦光纤(HNLF)的非线性系数和色散参数进行了测量。测得非线性系数为 γ=11.8W-1·km-1,色散斜率在1550nm附近为S=0.0157ps/(nm2·km)。其中,色散斜率测量值和商家给定的 值之间误差不超过5%。对在测量中抽运光和信号光之间由于拉曼放大作用所带来的增益谱不对称性进行了讨论。
Through the correction of the analytic solution of the gain of the fiber parametric gain and the expression of the phase matching under the ideal conditions, it is concluded that the peak gain of the small signal is proportional to the nonlinear coefficient of the fiber and the dispersion coefficient of the fiber and the peak gain wavelength The difference from the wavelength of the pump light is inversely proportional to two approximate expressions. Based on this, it is proposed that the small signal peak gain and the difference between the peak gain and the pump wavelength should be measured under the action of DC pump light, and then the nonlinear coefficient and dispersion parameter of the fiber can be obtained by simple algebraic operation. In the experiment, the nonlinear coefficient and dispersion parameters of a highly nonlinear flattened flattened fiber (HNLF) with a length of 1450m were measured by using two different wavelengths of pumping light respectively. The nonlinear coefficient was found to be γ = 11.8 W -1 · km -1 and the dispersion slope was S = 0.0157 ps / (nm 2 · km) near 1550 nm. Among them, the dispersion slope measurement and the value given by the merchant does not exceed 5% error. The asymmetry of the gain spectrum due to Raman amplification between the pump light and the signal light during the measurement is discussed.