400Gb/s光纤通信系统关键技术研究

The rapid development of high-speed and high-quality data and video services in communication networks necessitates a much higher bandwidth for backbone networks. The evolution of optical fiber transport network，from the current 40Gb/s system to forthcoming 100Gb/s and the future 400Gb/s system, has been one of the mainstays in telecommunications research worldwide. This project intends to theoretically and experimentally study key technologies for the dual-carrier, polarization-division multiplexing (PDM) 16QAM 400Gb/s optical fiber communication system. Based on high-speed digital signal processing, multidimensional constellation diagram design and advanced coherent detection algorithms are employed to further increase the transmission distance for 400Gb/s systems. This research will provide support for the final commercial deployment of 400Gb/s optical fiber communication systems. Major areas of study include: (1) multidimensional constellation diagram design of dual-carrier PDM-16QAM optical fiber communication systems; (2) nonlinear compensation algorithm and its optimization for dual-carrier PDM-16QAM; (3) maximum likelihood sequence estimation method of dual-carrier PDM-16QAM optical fiber communication systems.

光纤通信的发展进入了新时期。高速率高质量数据、视频等业务的不断发展，对电信骨干网络的传输带宽提出了更高的要求。从目前的单波长40Gb/s系统，向单波长100Gb/s甚至400Gb/s超大容量光纤传输网络的演进，已成为目前国际通信领域的未来主流发展方向之一。本项目拟在理论和实验两个方面研究基于双载波、偏振复用(PDM)16QAM调制方式的400Gb/s光纤通信系统中的关键技术。利用高速数字信号处理的手段，通过多维星座图设计和完善相干接收算法进一步提高400Gb/s系统的系统增益，增加传输距离。为400Gb/s光纤通信系统的最终商用提供技术上的支持和保障。本项目主要研究：（1）双载波 PDM-16QAM 光纤通信系统的多维星座图设计；（2）双载波 PDM-16QAM 光纤通信系统的非线性补偿算法及其优化；（3）双载波 PDM-16QAM 光纤通信系统的最大似然序列估计(MLSE)方法。

光纤通信的发展进入了新时期。高速率高质量数据、视频等业务的不断发展，对电信骨干 网络的传输带宽提出了更高的要求。从目前的单波长40Gb/s系统，向单波长100Gb/s甚至400Gb/s超大容量光纤传输网络的演进，已成为目前国际通信领域的未来主流发展方向之一 。本项目在理论和实验两个方面研究了400G b/s少模光纤通信系统中的关键技术。利用新型少模光纤支持更多空间模式和更大非线性容限的特性，进一步提高400Gb/s系统的系统性能，增加传输距离。本项目主要研究：（1）少模光纤传输理论容量极限，（2）少模光纤的准单模传输，（3）模分复用下频域递归最小二乘算法，（4）少模光纤的设计和特性测试，（5）少模拉曼放大器的噪声研究。本课题研究工作不仅奠定了少模光纤传输的理论基础，而且促进了单模光纤到少模光纤传输商用化的过渡发展，为400Gb/s光纤通信系统的最终商用提供技术上的支持和保障。