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利用半导体光放大器非线性偏振旋转效应实现全光采样具有采样速度高、输入抽运功率小的优点,为高速全光模数转换提供了可能途径。提出了半导体光放大器全光采样线性度和转换效率的表征方法,该方法利用传输曲线的多项式拟合函数表征采样系统,通过多项式的余弦代换和级数展开,得到全光采样线性度和转换效率与多项式系数的解析关系,从多项式系数直接计算线性度和转换效率。该方法无需复杂的傅里叶变换运算,其计算结果与傅里叶频谱分析结果吻合,可用于全光采样线性度和转换效率的精确表征,还可以拓展用于信号调制的非线性失真分析。
The use of semiconductor optical amplifier nonlinear polarization rotation effect of all-optical sampling with high sampling rate, the input pumping power advantages of small, high-speed all-optical conversion provides a possible way. A method for characterizing the linearity and conversion efficiency of all-optical sampling in semiconductor optical amplifiers is proposed. The method uses the polynomial fitting function of the transmission curve to characterize the sampling system. By polynomial cosine substitution and series expansion, the linearity and conversion of all- Efficiency and polynomial coefficients of the analytical relationship, polynomial coefficients from the direct calculation of linearity and conversion efficiency. The method does not need complex Fourier transform operation, and its calculation results are in good agreement with the Fourier spectrum analysis. It can be used to accurately characterize the linearity and conversion efficiency of all-optical sampling, and can also extend the nonlinear distortion analysis for signal modulation.