半导体光放大器全光采样的线性度与转换效率表征  

Characterization on Linearity and Conversion Efficiency of All-Optical Sampling Based on Semiconductor Optical Amplifiers

作　　者：张尚剑[1] 刘永[1] 张谦述[1] 李和平[1] 刘永智[1] 

机构地区：[1]电子科技大学光电信息学院,宽带光纤传输与通信教育部重点实验室,四川成都610054

出　　处：《光学学报》2009年第9期2529-2533,共5页Acta Optica Sinica

基　　金：国家自然科学基金(60736038);国家863计划(2007AA01Z269);预研基金(51302060101);教育部新世纪人才计划(NCET-06-0805,NCET-07-0152);四川省杰出青年基金(08ZQ026-12)资助项目

摘　　要：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 all-optical sampling based on the nonlinear polarization rotation in semiconductor optical amplifiers has the advantages of high-speed operation and small pump power, and it shows a possible solution for high-speed alloptical analog-to-digital （A/D） conversion. A novel method to characterize the linearity and efficiency of the alloptical sampling is proposed. The all-optical sampling transfer curve is fitted by a polynomial function, and the sampling system is described by the polynomial function. The efficiency and the harmonic distortion of the sampling process can be analytically expressed by the polynomial coefficients after substitution and expansion of the cosine function. It is not necessary to execute a complicated Fourier transform, and the results from our method are agreeable with those obtained by the Fourier analysis method. This method is simple but accurate and is useful for the full characterization on the linearity and efficiency of all-optical sampling based on semiconductor optical amplifier and can be extended to the nonlinear distortion of the analogue signal modulation.

关 键 词：信号处理 全光采样 半导体光放大器 非线性失真 线性度 

分 类 号：TN245[电子电信—物理电子学]