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人们通常利用拍频光信号的传输光谱演化来测量光纤的非线性系数。通过数值模拟分析了光源输出光功率和中心频率的扰动以及光源谱线宽度对该测量方法的影响,并进行了实验验证。使用紧凑的超格子算法分析了一种光子晶体光纤(PCF)的传输特性。考虑自相位调制(SPM)、损耗和群速度色散,采用分步傅里叶方法分析了拍频光信号沿光子晶体光纤的传输过程,得到了信号频谱演化的数值仿真结果。结果表明光源输出功率的扰动基本不会影响非线性系数的测量结果,但输出波长的扰动和光源的谱宽对非线性系数的测量有一定影响。因此需要选择适当的参数条件才可得到较为精确的实验结果。
People usually use the evolution of the transmission spectrum of the beat light signal to measure the nonlinear coefficient of the fiber. Through the numerical simulation, the disturbance of the output optical power and the center frequency of the light source and the influence of the width of the light source on the measurement method are analyzed and verified by experiments. A compact superglass algorithm was used to analyze the transmission characteristics of a photonic crystal fiber (PCF). Taking the SPM, the loss and the group velocity dispersion into consideration, the propagation of the beat-frequency optical signal along the photonic crystal fiber is analyzed by the step-by-step Fourier method. The numerical simulation results of the evolution of the signal spectrum are obtained. The results show that the disturbance of the output power of the light source basically does not affect the measurement of the nonlinear coefficient, but the disturbance of the output wavelength and the spectral width of the light source have some influence on the measurement of the nonlinear coefficient. Therefore, we need to select the appropriate parameters of the conditions in order to get more accurate experimental results.