近年来，模式复用和光纤无线MIMO技术研究已经成为下一代光网络领域的前沿热点，引发了一系列亟待探索的关键科学问题。. 我们提出“模式复用与MIMO相融合的Front-haul传输损伤及其抑制研究”，拟采用理论分析、数值计算和实验验证相结合的研究方法，探索模式复用与MIMO相融合的Front-haul传输构架，研究M-QAM高阶调制传输，探索传输中模式串扰损伤和非线性损伤机理，研究传输损伤抑制机制，构建相应系统进行实验验证；提出模式间大有效折射率差和渐变折射率分布方法来探索解决模式间串扰大耦合强的关键问题。. 本项目研究将推进模式复用与MIMO相融合的Front-haul传输实用化，有效提升Front-haul传输容量和频谱利用率，降低网络成本，为我国宽带光网络发展提供理论和技术支持，应用前景广阔。

In recent years, research on mode division multiplexing and MIMO has already become international frontier issue of the next-generation optical network. It aroused a series of key scientific problems. . We propose Impairment and suppression of front-haul transmission based on mode division multiplexing and MIMO. We will solve several theoretical and technological problems for practical application by using theoretical analysis, numerical methods and experimental verification, investigate the high level M-QAM modulation transmission, study impairment mechanism of mode crosstalk and nonlinearity, investigate their suppression method, and realize the experimental prediction of corresponding system. To solve the mode crosstalk, we propose methods of big difference of refractive index between different modes and distribution of graded index.. This project will promote the realization of front-haul transmission based on mode division multiplexing and MIMO, effectively improve the performance of capacity and spectrum efficiency of the front-haul transmission, reduce the cost of the front-haul system, supply the theory and technique for broadband optical access network in China, and has potential applications.