频谱灵活的WDM-OFDMA-PON可以很好的满足下一代光接入网的发展方向：更高的接入带宽、更远的传输距离、更大的分光比以及带宽资源的灵活、动态分配。本项目拟对该网络中光信号传输损伤的感知及DSP动态补偿机制，频谱灵活条件下的资源利用效率评价、感知机制以及资源的动态分配、重构机制，进行全面、深入的研究分析。基于完善传输信道模型和Q因子，通过解析法、先验回归法以及训练序列法的结合，实现频谱灵活WDM-OFDMA-PON中子载波级的传输损伤实时、准确感知。利用DSP技术，结合导频、训练序列、盲补偿以及损伤感知的相关结果，实现传输损伤的动态、精确补偿；基于网络资源利用效率的评价与感知，结合传输损伤感知，实现网络资源的高效利用和重构。相关成果将为下一代光接入网中光信号传输的优化以及资源的弹性、高效、可靠分配提供理论依据和技术支持。

The properties of next generation optical access networking: higher bandwidth, longer transporting distance, higher splitting ratio and dynamic bandwidth allocation, which can be met by flexible WDM-OFDMA-PON. Based on the experimental system of WDM-OFDMA-PON Metro/access networking, the project focuses on the transporting impairment awareness of optical signal and the compensation based on digital signal processing (DSP), the evaluation of bandwidth efficiency, the dynamic bandwidth allocation and refactoring. The research contents of project include: based on accurate channel model and Q factor, using analytic method, prior regression method and training sequence method implements precise impairment awareness of OFDM subcarriers in WDM-OFDMA-PON; Based on the results of impairment awareness, combining with pilot frequency, training sequence and blind compensation, using DSP achieves accurate transporting impairment compensation. Using impairment awareness and bandwidth efficiency evaluation, designs more efficient dynamic bandwidth allocation mechanism and bandwidth refactoring method. The achievements can provide reference to improving the property of optical signal transporting and the efficiency of dynamic bandwidth allocation in next generation optical access networking.