宽带微波/毫米波信号的光子学发生

项目名称： 宽带微波/毫米波信号的光子学发生

项目编号： No.60871011

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 无线电电子学、电信技术

项目作者： 池灏

作者单位： 浙江大学

项目金额： 35万元

中文摘要： 研究基于光子学方法的宽带微波/毫米波信号发生，主要应用领域为超宽带通信和测量、脉冲压缩雷达系统。一是研究大时间带宽积微波/毫米波信号的发生，内容包括相位编码和啁啾(即调频)微波/毫米波信号发生，主要用于脉冲压缩雷达系统中，以实现高倍的脉冲压缩比。拟采用基于光学相位调制和外差相干的方式实现高载频、大带宽的相位编码射频信号发生；拟利用短脉冲光在色散介质中的波长－时间映射关系来产生大啁啾系数的射频信号。二是研究无载波超宽带脉冲信号的发生，主要是构建微波光子微分器，实现对输入高斯脉冲的各阶微分功能，将脉冲频谱移向高频部分，以适应于超宽带通信系统的需要。本项目的新意在于以微波光子学的方法产生宽带射频信号，充分发挥光子学方法的优势，克服传统电子方式存在的电子瓶颈，优点是可以产生传统电子学方法难以产生的高载频、大带宽的射频信号。本项目之研究内容在民用无线通信和军用雷达系统中有重要的应用前景。

中文关键词： 微波光子学；微波信号发生；超宽带通信；脉冲压缩雷达；时间带宽积

英文摘要： This project investigates the photonic generation of wideband microwave/millimeter-wave signals. The major application fields are ultra-wideband communications and measurements, and pulse compression radar systems. The first research area is the generation of microwave/millimeter-wave signals with large time-bandwidth products, including the generation of the phase-coded and chirped (i.e. frequency-modulated) microwave/millimeter-wave signals. It can find applications in pulse-compresson radar systems that require high pulse compression raito. We will realize the generation of phase-coded RF signals with high carrier frequency and wide bandwidth employing the method of optical phase modulation and coherent heterodyne. We will also realize the generation of highly chirped RF signals based on the wavelength-to-time mapping of the short optical pulses propagation in a dispersive media. The second research area is the generation of carrierless ultra-wideband pulse signals. This part of investigation focuses on the construction of photonic microwave differentiators which are used to realize the differentiation function on the input RF signals. The aim of the differentiation is to move the pulse spectrum to higher frequency end in order to satisfy the requirement of the ultra-wideband communications. The novelty of the project lies on the generation of the wide-bandwidth RF signals in a photonic way, which employs the advantages of photonics and overcomes the electronic bottleneck in traditional electronic methods. The major advantage of the proposed approach in the project is that the RF signals with very high carrier frequency and very large bandwidth can be generated, which is hard to realize in traditional electronic methods. The research results of the project can find important applications in civil wireless communicatons and military radar systems.

英文关键词： Microwave photonics; microwave signal generation; ultra-wideband communications; pulse compression radar; time-bandwidth product