高阶调制信号的多波长2R再生技术研究

All-optical regeneration can enhance the switching function of optical nodes and improve the performance of optical networks by alleviating the signal degradation caused by fiber dispersion and nonlinear effects, amplified spontaneous emission (ASE) noise and channel crosstalk in long-haul transmission. Due to the more wide application of high-order modulation signals in optical dense- wavelength- division- multiplexing (DWDM) systems, the project will mainly focus on all-optical regeneration mechanism of high-order modulation signals, the characterization of all-optical multi-level 2R regeneration performance, and the development of multi-wavelength silicon-based regeneration chips. There are three innovations as follows: (1) a universal design method of embedded MZI-based all-optical regeneration schemes for high-order modulation signals is put forward; (2) the reshaping performance of all-optical 2R regenerators can be defined by the two parameters of differential gain and jitter reduction ratio; and (3) the large-capacity silicon-based regeneration chips are realized by the time-slot interleaved multi-wavelength high-order modulation formats. Our objective is to further promote the practical applications of silicon-based regeneration chips to optical transmission systems and optical switching nodes.

全光再生技术能够克服光信道色散和非线性、放大自发辐射噪声、信道串扰等所导致的传输信号劣化，对增强光交换节点功能、提升光网络性能具有非常重要的意义。随着高阶调制信号在光波分复用系统中越来越多的应用，有必要研究高阶调制信号的多波长2R再生技术，以满足系统越来越高的信噪比需求。本申请项目主要开展高阶调制信号的全光再生机制、多电平全光2R再生性能参数表征、多波长硅基再生芯片研制三个方面的研究；创新之处在于，提出基于嵌套马赫-曾德干涉结构（MZI）的高阶调制信号再生设计方法，定义微分增益和抖动抑制比两个参数来表征全光2R再生器的整形性能、采用高阶调制的多波长时隙交织信号格式实现大容量的硅基再生芯片。我们的目标是推动硅基再生芯片在光传输系统或光交换节点中的应用。

高阶调制信号在光波分复用系统中越来越多地应用，它们对系统的信噪比要求更高。高阶调制信号的多波长2R再生技术能够克服光信道色散和非线性、放大自发辐射噪声、信道串扰等所导致的传输信号劣化。项目主要开展了光纤或波导的非线性基础理论、高阶调制信号2R再生的各种方案、多波长再生芯片的设计与实现，以及多通道运算器与少模再生技术等四个方面的研究内容。项目基于MZI和NOLM及其级联结构，提出了实现PAM和QPSK/QAM信号再生的多种方案。采用高阶调制的多波长时隙交织信号格式实现硅基MZI再生芯片，评估了它对16QAM信号的再生性能。结果表明，在22dB输入信噪比下可实现6.6dB的EVM改进，最大相位扰动只有6.8度。发表期刊论文22篇、申请专利14项、出版学术专著两部; 培养硕、博士研究生16人。