光纤通信系统中的非线性数字补偿调制研究

Research on nonlinear digital compensation modulation in optical fiber communication system

为了分析不同调制方式下的光纤通信系统非线性数字补偿效果,文中以具有标准单模光纤(SSMF)传输链路的间隔波分复用(WDM)光纤通信系统为基础,通过建立信号之间、信号与噪声之间相互作用引起的非线性失真数学模型,利用互信息(MI)与可达信息速率(AIR)作为多信道数字反向传播(MC-DBP)计算复杂度指标,研究了理想Nyquist间隔光纤通信系统中调制方式与MC-DBP性能的关系。实验结果表明,最大信道DBP系统的非线性失真与调制方式无关,而电子色散补偿(EDC)和部分信道DBP的非线性失真取决于调制方式。

In order to analyze the effect of non-linear digital compensation in optical fiber communication systems with different modulation modes,based on Interval wavelength division multiplexing( WDM)optical fiber communication systems with standard single-mode optical fiber( SSMF) transmission links,it establishes a mathematical model of non-linear distortion caused by the interaction between signals and noises,utilizes the mutual information( MI) and achievable information rate( AIR) as computational complexity indices of multichannel digital back propagation( MC-DBP),and studies relationship between modulation mode and MC-DBP performance in ideal Nyquist interval optical fiber communication system.The experimental results show that the nonlinear distortion of maximum channel DBP system is independent of the modulation mode,while the nonlinear distortion of electronic dispersion compensation( EDC) and partial channel DBP depends on the modulation mode.