相干光通信系统中光学辅助自适应信号损伤补偿技术研究

Signal impairments compensation is one of the foundational functions and essential techniques for ultra-high speed, large capacity and long hual optical fiber transmission systems. Therefore, it would be valuable, in both theoretical and practical point of view, to investigate related signal impairements compensation techniques for coherent detected optical fiber communication systems. In this proposal, taking adaption, low complexity, and software/hardware transparency compensation techniques as key issues and developing trend, we plan to investigate mechanisms and schemes of signal impairements compensation with optics-aided compensation methods. The mainly goals of the proposal include but not limited to the following: (1) Investigating real-time, dynamic, adaptive, rate and format transparent chromatic dispersion compensation techniques with all-optical aided dispersion estimation and electronic dispersion compensation; (2) Achieving low complexity, adaption and multi-impairement simultaneous mitigation based on only one optics-aided mean with corresponding DSP algorithm; (3) Optimizing the before-mentioned techniques, determing the impairement mechanisms in multi-channel system, and extenting them to multi-channel system.

信号损伤补偿是未来超高速、大容量、长距离光纤通信系统的基础性功能和关键技术。因此，针对相干光通信系统，围绕信号损伤补偿这一基本功能开展研究具有重要理论价值和实际应用意义。本项目针对信号损伤补偿自适应、低复杂度、软/硬件透明化等发展趋势与需求，探索光学辅助自适应信号损伤补偿的机制和解决方案。主要目标包括：（1）利用全光色散自适应估计辅助电域色散补偿技术，探讨实时、动态、自适应以及速率和调制格式透明的色散补偿技术；（2）采用同一光学辅助手段，辅助电域数字信号处理技术，实现光纤非线性、相位噪声、载波相位损伤等多种损伤的同时、自适应、低复杂度补偿；（3）优化与完善相关技术方案，明确多信道损伤与单一信道损伤的异同，探索将相应技术延拓至多信道系统的技术方案。

信号损伤补偿是未来超高速、大容量、长距离光纤通信系统的基础性功能和关键技术。本项目针对高速相干光通信系统信号损伤的自适应、低复杂度、软/硬件透明化补偿的机制和方法进行了理论分析和实验研究。其主要内容包括：研究了自适应色散补偿理论，提出并实验验证了基于修正快速恒模算法和基于改进均峰功率监控算法自适应色散补偿方法；对光纤非线性、相位噪声、载波相位对传输信号的损伤机理进行了研究，在此基础上提出并实验验证了基于背向传输、光相位共轭结合数字信号处理技术、全光信号处理技术等多种多重信号损伤自适应补偿方法；研究了多偏振态复用系统信号损伤机理，针对多偏振态复用系统提出了基于斯托克空间变换、相位空间矢量分析法等多种信号损伤补偿技术，首次实现了25Gbps三偏振态复用DPSK 信号的300km单模光纤传输和100Gbps四偏振态复用DPSK信号的150km单模光纤传输。