国内外宽带接入技术发展如火如荼，符合NG-PON2技术要求的提案多达5项，但随着节能环保设计理念的深入人心，同时具备低能耗和高性价比的接入网扩容技术将越来越受到运营商的推崇。本项目围绕接入网扩容机制、信号损伤均衡机理和自适应调度机制三个科学问题，研究基于无载波幅度相位调制（CAP）的时域波形正交复用技术，主要内容包括：1）基于时域波形正交复用技术的宽带光接入技术；2）支撑宽带光接入的高精度信道均衡和补偿技术；3）高效二维带宽自适应调配及智能休眠节能机制；4）绿色低成本宽带光接入网系统测试与验证。本项目的特色与创新在于：1）时域波形正交复用扩容；2）可重构多维正交滤波器设计方法；3）二维动态带宽分配算法。与正交频分复用技术相比，无载波相位调制算法简单、无需昂贵的高速光电器件和ADC器件、可同时兼顾扩容、成本及能耗。项目研究成果可望用于我国"宽带战略"的实施，具有重大的理论意义和应用价值。

The development of broadband access technology at home and abroad is in full swing, and up to five proposals have been submitted to meet the NG-PON2 technical requirements. However, since energy conservation and environmental protection are gaining increasing concerns in recent years, the broadband access network technology which has both low-energy and high cost-effective properties will get tremendous attention. By focusing on three scientific problems which include how to increase the capacity of optical access network at low costs, how to compensate the distorted signal efficiently and how to allocate the bandwidth adaptively, the carrierless amplitude and phase modulation (CAP)-based orthogonal waveform division multiplexing technique (ODMA) will be proposed and comprehensive investigated in this project proposal. Several aspects content are included in this proposal as following: 1) a capacity expansion method of the low-energy, low-cost optical access network will be presented by using ODMA technique; 2) the effect of the interaction of the ODMA signal with fiber dispersion, nonlinearity and beating noise will be analyzed and investigated to present the novel and effective channel estimation and equalization algorithm; 3) an adaptive and dynamic bandwidth allocation algorithm and an intelligent sleep mechanism will be studied and designed; 4) a novel green, low-cost and broadband next generation PON system which combine the ODMA with time division multiple access (TDMA) techniques will be proposed. This project bears its own originalities as following: 1) a novel and low-cost capacity expansion method of optical access network based on ODMA is proposed; 2) the method for the optimal design of multi-dimensional orthogonal CAP filters is presented; 3) a novel, adaptive and dynamic bandwidth allocation algorithm based on the waveform and time slot is designed. Our prophase investigations show that compared with orthogonal frequency division multiplexing (OFDM) technique, the carrierless amplitude and phase modulation (CAP) technique do not need expensive optical and electronic devices, and has simpler algorithm structure, lower energy consumption, and similar broadband performance. Therefore, research results of this project will have great theoretical significance and practical values, and could be used for the implementation of "China Broadband Strategy" program.