太赫兹轨道角动量通信中信道串扰和功率损耗机理研究

Terahertz communication is one of the most promising technologies in the field of future high speed wireless communication. How to further improve the system capacity is a hotspot but also the difficulty. Recently, the orbital angular momentum (OAM) communication method has obtained many researches in both microwave and optical communications, which shows the matchless ability in improving the capacity of the communication systems. Since Terahertz is between the two wavebands, if the OAM communication method is adopted, the terahertz communication system will undoubtedly gain the same capacity improvement. However, there are few combined studies between the OAM communication method and terahertz communication, the terahertz OAM communication applications are badly in need of some theoretical and experimental studies. For these reason, this project will focus on the mechanisms of the method in consideration of the characteristics of the terahertz waves. A 3D model will be built to simulate the terahertz OAM beam generation, multiplexing, transmission and de-multiplexing processes, which could reveal how the important parameters of channel crosstalk and power loss are influenced by the parameters of the OAM beam generation and de-multiplexing components, beam misalignments and the channel bandwidth. These would help find the system limitations and optimize the system parameters design. Besides, some special experiments will be carried out to validate the theoretical results. This project will lay the foundations for the long distance and high speed terahertz OAM communication technology.

太赫兹通信技术是未来高速无线通信领域极具应用前景的新技术，如何进一步提高太赫兹通信系统的容量是目前研究的热点。近年来，轨道角动量（OAM）通信方法在光学和微波频段都获得了大量研究，极大地提升了这些频段的通信系统容量。太赫兹位于光学和微波频段之间，如采用OAM通信方法，太赫兹通信系统的容量必定也能获得大幅度提升。但是太赫兹通信技术和OAM通信方法相结合的研究还非常少，太赫兹OAM通信系统的实现亟需一定的理论和实验研究。为此，本项目将根据太赫兹波的特点，对太赫兹频段OAM光束产生、传播和分离过程进行三维理论建模和仿真计算，分析OAM光束产生和分离组件参数、光束失准和信道带宽等对太赫兹OAM通信中信道串扰和功率损耗等关键参数的影响，探索该方法的局限性和优化系统设计参数，并针对性地开展初步的实验工作。本项目的研究可为远距离大容量太赫兹OAM通信系统的实现奠定系统的理论基础和一定的实验基础。

随着太赫兹技术的快速发展，太赫兹通信在展示带宽和高速传输功能的同时，逐步展示了广阔的应用前景。本项目将轨道角动量模分复用方法应用到太赫兹高速通信中，试图提升太赫兹通信系统容量，并为太赫兹频段轨道角动量通信应用提供一定的基础。项目研究中，以微波和光学频段OAM通信研究为基础，构建了太赫兹轨道角动量通信系统的架构，针对该系统的特点，对太赫兹频段OAM光束产生、传播和分离过程进行理论建模和仿真计算，分析了OAM光束产生和分离组件参数、光束失准和信道带宽等对太赫兹OAM通信过程的影响，分析了这些参数对远距离大容量太赫兹OAM通信系统应用的影响，结果表明，这些因素在远距离通信过程具有较大影响，在系统设计和研制中需要加以重视；针对透射式螺旋相位波板存在吸收和介质表面多次反射的缺点，提出了采用反射式螺旋相位波板产生和分离太赫兹OAM波束的新方法，并作了设计和分析；围绕太赫兹轨道角动量通信应用，研究了太赫兹频段主动光调制方法等相关方面，为未来的应用研究工作奠定基础。