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机构地区:[1]南京邮电大学信号处理与传输研究院,江苏南京210003 [2]南京邮电大学通信与信息工程学院,江苏南京210003
出 处:《南京邮电大学学报(自然科学版)》2016年第3期47-52,共6页Journal of Nanjing University of Posts and Telecommunications:Natural Science Edition
基 金:国家自然科学基金(61271238;61475075);教育部高等学校博士学科点专项科研基金(20123223110003);江苏省研究生培养创新工程(SJLX15_0366);江苏省普通高校研究生科研创新计划(KYLX0810)资助项目
摘 要:轨道角动量(OAM)是经典力学和量子力学的基本物理量。由于OAM态取值无限,且不同OAM态正交,OAM态成为复用技术的新型自由度,极大地提升了经典和量子通信的容量和频带利用率,OAM态复用受到了极大的关注。但是,其中的OAM态检测是复用技术的难点之一。文中给出一种OAM态精细分离方法的仿真实现。仿真使用拉盖尔高斯(LG)模块模拟空间光调制器(SLM)给零阶光束加载涡旋相位,采用坐标转换模块模拟涡旋光束展开到平面波的变化。仿真中通过对矩阵的复制来模拟平面波相位梯度的增加,最后利用傅里叶变换模拟凸透镜聚焦光斑来完成OAM态分离与检测。仿真结果表明,该方法可以大幅度提高OAM的检测精度。Orbital angular momentum (0AM) is a basic physical quantity of classical and quantum me- chanics. The unlimited index value and the orthogonally of 0AM states bring a new degree of freedom for multiplexing, thus improving the capacity and spectral efficiency of classical quantum communication sys- tems. However, the separation of OAM state is still a challenge problem in OAM multiplexing. A simula- tion implementation with high efficient separation of OAM state is presented. In the simulation with Lab- view, the Lagueree-Gaussian (LG) module is used to simulate the zero order beam loaded with a special OAM state (vortex phase), which is implemented by a spatial light modulator (SLM) in the experiment. The vortex phase beam is then transformed into a plane wave by the coordinate transformation module. Subsequently, a copy matrix ( fan-out module) is used to operate at the phase gradient of the plane wave to increase the separation efficiency. Finally, the OAM state separation and the detection are completed with a lens simulated by FT module. Simulation results show that the method can improve the detection precision of the OAM state.
分 类 号:TN911.74[电子电信—通信与信息系统] O431.2[电子电信—信息与通信工程]
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