基于QAM光载毫米波信号的10Gb/s RoF系统关键技术研究

项目名称： 基于QAM光载毫米波信号的10Gb/s RoF系统关键技术研究

项目编号： No.61001061

项目类型： 青年科学基金项目

立项/批准年度： 2011

项目学科： 轻工业、手工业

项目作者： 马健新

作者单位： 北京邮电大学

项目金额： 7万元

中文摘要： 具有较高频谱效率的正交幅度调制（QAM）能够将毫米波信号的数据速率提高到10Gb/s甚至更高，基于QAM的RoF技术是10Gb/s的高速长距离毫米波通信系统有效的实现方案。本项目研究了光纤一、二阶色散等特性对二进制和QAM光载毫米波信号传输性能的影响，分析了毫米波信号的传输距离与光纤色散、载波频率、数据速率之间的关系，确定了适合长距离传输的高速光载毫米波信号的光谱结构特征；研究了铌酸锂电光调制器在射频驱动下的非线性特性及其产生高阶倍频的物理机制，提出了适合长距离传输的高速光载毫米波信号产生方法，设计出以低速调制器和低频本振产生适合长距离传输的4倍频二进制和QAM光载毫米波信号的基站无源全双工RoF链路实现方案和能够携带2个10Gb/s的四倍频RoF链路；并搭建了5Gb/s和10Gb/s的仿真系统，仿真结果和理论分析一致，所提出的链路适合可用于高速的毫米波信号长距离传输。研究成果发表在SCI检索的国际期刊和国际会议上，这些研究成果为RoF技术的发展和应用奠定基础，为10Gb/s的宽带无线接入提供技术积累。

中文关键词： 微波光子学；光载射频（RoF; raido over fiber)；正交幅度调制（QAM）；光纤色散

英文摘要： Quadature amplitude modulation (QAM) with higher spectrum effiency can improve data rate of the millimeter-wave signals to 10Gb/s and even beyond, so the RoF technology based on QAM is a good scheme to implement long-haul transmission of the 10Gb/s millimeter-wave signals. Under the support of this project, we have investigated the influence of the first and second order fiber chromatic dispersion on the transmission perforamcne of the binary and QAM optial millimeter-wave signals along the fiber, anlayzed the relationship between the transmission distance of the signal and the fiber dispersion, millimeter-wave frequency and data biterate, and then obtained the spectrum charateristic of the QAM　optical millimeter wave signal suitful for long-haul transmission.Then, the nonlinear modulation characteristic of the LiNbO3 Mach-Zehnder modulator driven by the high power RF signals are analysed and the machinism of generation of the higher order sidebands is described. Based on these, We have proposed two full-duplex RoF links with frequency quadrupling via a low frequency LO and optical modulator without optical source at BS with Binary or 16-QAM modualtion formats, respectively, and a RoFlink with dual stream of 10Gbit/s QAM optical millimeter-wave signals and quadrupling local oscillator. and then, the simulation links with 5Gb/s and 10Gb/s RoF links are built in the simulation platform to verfy our theoretical analysis. Our research works in this project have been published or submitted to the international journals and conferences and the results will be helpful for the future development of the RoF technology and 10Gb/s super boardband wireless access technology.

英文关键词： Microwave photonics; radio over fiber (RoF); Quadature amplitude modulation (QAM); fiber dispersion