基于时频变换的奈奎斯特时分复用系统时钟提取与解复用关键技术研究

This project will research and develop clock recovery and demultiplexing techniques for Nyquist optical time-division multiplexed (N-OTDM) systems aiming at 1 Tbit/s and beyond, to meet the requirement of future optical communication with large capacity and high spectral efficiency. Demultiplexed-feedback optoelectronic oscillation loop based direct clock recovery scheme is proposed to achieve a recovered base-rate clock with stability, low complexity, and low timing-jitter; demultiplexing scheme based on frequency-domain matched sampling will also be considered to achieve parallel inter-symbol-interference-free reception for multi-tributaries. Based on time-to-frequency conversion, these two techniques are of unity, which are expected to upgrade the overall performance of the system without increasing the complexity. Focused on these two key techniques, this project will conduct a series of scientific experiments to verify the new mechanisms and the system compatibility. This project, if success, is expected to lay new theoretical and technical basis for N-OTDM system in future optical communication systems, to promote and advance scientific fields of large capacity optical telecommunication and high speed optical signal processing in China, and to trigger wide attention and discussion for the new techniques in both academic and industry communities.

本项目面向未来大容量、高谱效率的光纤通信系统的需求，重点对1 Tbit/s以上的奈奎斯特时分复用（N-OTDM）系统中的时钟提取和解复用两个关键技术的理论和机制开展研究。创新性地提出了基于解复用反馈光电受迫谐振环路的基频时钟直接提取技术，实现稳定、低复杂度和低抖动的基频时钟提取；本项目还将研究基于频域匹配采样的解复用技术，实现并行多路无码间干扰接收。两个关键技术相互依存、统一建立在时频变换技术之上，可进一步降低系统接收端复杂度，提升系统整体性能。通过对上述研究，本项目将进行一系列科学实验，完成上述关键技术新理论、新机制的测试与系统实验验证，突破当前N-OTDM系统接收端技术瓶颈。研究成果预期将为N-OTDM系统在未来光通信系统中的应用奠定新的理论和技术基础，带动和促进我国大容量新型光传输系统和高速光信号处理科学与技术的提升，触发工业界和学术界对相关领域技术的广泛关注和讨论。

本项目面向未来大容量、高谱效率的光纤通信系统的需求，重点对1 Tbit/s以上的奈奎斯特时分复用（N-OTDM）系统中的时钟提取和解复用两个关键技术的理论和机制开展研究。创新性地提出了基于解复用反馈光电受迫谐振环路的基频时钟直接提取技术，实现稳定、低复杂度和低抖动的基频时钟提取；本项目还研究了基于频域匹配采样的解复用技术，实现了并行多路无码间干扰接收。两个关键技术相互依存、统一建立在时频变换技术之上，进一步降低了系统接收端复杂度，提升了系统整体性能。通过对上述研究，本项目进行了一系列科学实验，完成上述关键技术新理论、新机制的测试与系统实验验证，突破当前N-OTDM系统接收端技术瓶颈。