新一代光网络性能监测中的调制码型及多参数分析研究

Ever emerging new broadband data services have been driving the transmission speed of optical fiber communication system to ultra-high data rate, such as 400 Gbit/s or even 1Tbit/s. With the move to higher transmission speed, optical signal transmission impairments such as noise, chromatic dispersion, polarization-mode-dispersion and fiber nonlinearity will have higher impact to the performance of the transmission systems. New dynamic optical networks have also created the need for the network to analyze and monitor the impairments and to mitigate their impact. In this project, based on this need and our previous work in the area, we propose to study modulation formats identification, in-band optical-signal-to-noise ratio (OSNR) monitoring of multi-dimensional multiplexed optical transmission systems, identification of multiple parameters in the dynamic optical networks and effective use of optical performance monitoring technique for the effective design of future optical networks. Through the study, we will find effective approach for identifying modulation formats in multi-dimensional multiplexed optical transmission systems; understand the interaction mechanism and multi-parameter extraction among various transmission impairments and establish the model for estimating multiple physical parameters. These efforts shall enable the realization of modulation format identification and optical signal to noise ratio monitoring for the intermediate nodes in optical networks and multi-parameter estimation and monitoring at the receiving ends. The research work shall provide the theoretical and experimental basis for further research in the area of modulation format identification and multi-parameter separation and monitoring for next generation optical networks. It shall also enable us to simplify the realization of coherent detection algorithm, improve system performance and enable the realization of dynamic optical networks.

新型宽带数据业务的增加推动着光纤通信系统向着400-Gbit/s甚至1Tbit/s超高速率方向发展。超高速光信号在光纤链路中受到噪声、色散、偏振模、非线性等物理效应更加严重的损伤。新一代动态光网络需要具备损伤动态分析和监测的能力，以补偿这些损伤。本项目围绕新一代光网络的这个能力需求，基于前期工作，对光信号调制码型识别、多维复用光传输系统中的带内光信噪比监测、动态光网络中的多物理效应分离机制、光性能监测技术与网络融合等问题展开研究，解决多维复用系统中调制码型识别机制；多物理损伤相互作用机理与多参数提取；光网络中物理参数高效估测模型的建立等关键问题，最终在网络中间节点实现调制码型、光信噪比等的在线监测；在接收端实现多参数的分离估计与监测。成果将为新一代光网络中的调制码型识别和多参数分离监测的理论和实验研究奠定基础和积累经验，为简化相干接收算法、提高系统性能、实现动态可调的光网络提供重要支撑。

光纤通信系统经过几十年的发展，目前单模光纤通信系统的容量受限于非线性香农极限，已经趋近于物理极限。为了满足互联网增长的需求，超越单模光纤通信系统的非线性香农极限，解决光通信技术瓶颈难题，目前国际上的研究热点是利用多维光信息传输技术，即在光载波的时间维度、相位维度、频率维度、偏振维度以及空间维度上同时加载信息，以提升光通信系统承载的信息容量。.在多维光通信系统中，不同维度的光信号都会遇到不同的物理损伤、不同维度之间的信息也会发生耦合和裂化，会遇到多维复杂系统的优化和补偿问题，从而严重影响光信号的传输质量和系统承载能力，亟需研究多维光信号的动态损伤监测和补偿技术。.在国家自然科学基金重点项目的支持下，项目组经过5年的攻关，在① 信道特征快速估计与高效信号解调算法；② 空间维度信息感知；③ 超快、高分辨率光电器件频谱信息分析新机理等方面取得了创新性成果。.项目执行期间，参与撰写光通信专著一部，负责其中光性能监测的章节；发表SCI论文61篇，其中特邀综述论文2篇，特邀论文1篇；授权国际发明专利4项；培养硕士、博士毕业生15名；研究成果获得第四届中国科协优秀科技论文，研究成果获得中国专利优秀奖。.研究成果在华为技术公司的光网络通信设备中得到了应用；研究成果在电力网络通信系统中得到了应用。