基于软件定义的多载波灵活接入技术研究

With the development of FTTX, the flexibility of optical access technology has become the research focus of optical fiber communication, and is also the technical support of China's "broadband speed and cost reduction".This project researches on software defined ultra dense multi carrier flexible access technology, the goal is to reduce the cost of ONU in the access terminal, improve the coverage of passive optical network, increase the number of users access, and increase the flexibility of access network.This project is designed to generate stable multi carrier under the condition of low cost by designing the multi carrier generation module.Then the project optimizes the structure of PON through software defined network, and proposes a spectrum and time slot assignment algorithm based on software defined networking to guarantee the joint allocation of uplink downlink bandwidth. Finally, the wavelength reuse algorithm and the wavelength selection algorithm at the access end are studied, and a reasonable wavelength reuse structure is designed.By compatibility testing network architecture and system module, debugging system and related hardware module, we realize the new architecture of PON system based on SDN system. The work include multi carrier generation, debugging wavelength scheduling module, control terminal bandwidth allocation algorithm and wavelength reuse module.

随着FTTX的发展，光接入技术的灵活性已经成为光纤通信的研究热点，也是我国宽带“提速降费”的技术支撑。本项目拟研究基于软件定义的超密集多载波灵活接入技术，在接入端降低ONU的接入成本，提高无源光网络的覆盖范围，提高接入用户数量，增加接入网的灵活性。本项目拟通过设计超密集多载波产生模块，在低成本条件下产生稳定多载波。然后项目通过软件定义网来优化PON的结构，提出基于软件定义的频谱、时隙联合分配算法，保证上行下行带宽的联合分配。最后研究波长重用算法以及接入端的波长选择算法，设计合理的波长重用结构，通过多载波技术完成波长的有效重用，将大大降低接入端成本。通过网络架构和系统模块的兼容性测试，完成相关系统和硬件模块的调试，实现新型基于SDN的PON架构的模块化系统，包括多载波产生，波长调度模块、控制端带宽分配算法及波长重用模块的联合调试。

项目围绕多载波灵活接入技术，超密集多载波产生方案和多载波接入PON系统架构三方面开展了一系列理论性和探索性工作，提出了支撑高数据速率传输的下一代无源光网络平坦光多载波产生技术，实现了基于强度调制器级联的大容量光频梳线路信号产生；研究分析了基于动态调节因子的低PAPR OFDM-PON系统，提出了基于混沌集分区SLM的降PAPR高安全多载波光接入方法；针对接入网的性能提升，设计了基于7维细胞神经网络的七芯光纤加密方案，提出了一种基于极化码内混沌加密的高可靠七芯光纤光接入系统，实现了单激光源下的波分复用无源光传输。项目搭建了外调制器和光频梳相结合的光接入网实验系统，开展了实验验证。基于上述研究工作，在本领域学术期刊上发表了学术论文13篇。项目的研究工作可为下一代多载波灵活接入网的发展提供技术参考。