基于光子自旋角动量模式的光控真延时技术研究

项目名称： 基于光子自旋角动量模式的光控真延时技术研究

项目编号： No.61307081

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 李尚远

作者单位： 清华大学

项目金额： 24万元

中文摘要： 光控真延时技术是构建光控相控阵天线的支撑技术，而光子自旋角动量（OAM）则是近年来重回研究者视野的电磁场维度，至今尚未被应用于光真延时技术等微波光子系统中。本项目拟研究光OAM模式在环形折射率光纤中的传播特性、色散特性，探索利用光OAM模式实现光真延时技术的可能性，研究光控真延时网络中OAM模式调控的机理与策略，以期利用OAM模式色散在新的维度实现光控真延时；进一步将其与传统真延时技术相结合，探索多维度延时控制的实现方案，探索支持二维多波束扫描的光控真延时网络结构。通过项目开展，设计适合于光真延时技术的环形光纤结构、并最终设计X波段、4路光真延时线结构，实现延时1000ps。

中文关键词： 轨道角动量；环形芯光纤；延时线；微波光子；光纤通信

英文摘要： Optical true time delay (TTD) is the fundamental technique of establishing optical controlled phased array antennas. Optical orbital angular momentum (OAM), which is a dimension of electro-magnetic field of increasing interest, has not yet been employed in microwave photonic systems such as optical TTD system. This program is aimed to characterize the propagation and chromatic dispersion performance of optical OAM modes transmitting in ring fibers, and demonstrate the possibility of adopting the optical OAM modes to implement optical TTD, as well as search for the theory and strategies of monitoring OAM modes in optical TTD systems, and realize optical TTD in a novel dimension employing the OAM mode dispersion. We also anticipate combining this technique with the traditional TTD techniques, implementing multi-dimension time delay control, realizing an optical TTD system which supports two dimension multi-beam scan and designing. Through this project, a ring fiber structrue will be studied and designed for optical TTD technology, and design an X-band TTD structure with four channels, and realizing time delay of 1000ps.

英文关键词： Orbital angular momentum；ring core fiber；time delay line；microwave photonics；optical fiber communication