【作者】 吴树强；

【导师】 裴丽；

【作者基本信息】 北京交通大学 ， 通信与信息系统， 2009， 硕士

【摘要】 随着通信技术的发展,人们对通信带宽、接入速率、服务质量和通信网建设性价比的要求越来越高,人们迫切需要一种能综合以上优点的技术出现,RadioOver Fiber(ROF)技术应运而生。微波光子发生器作为系统副载波信源应用于ROF系统可以简化系统结构,降低建设成本,扩展通信带宽,具有非常好的应用前景。本文主要研究基于微波光子发生器的ROF技术。本论文重点研究基于微波光子发生器的ROF技术。论文主要内容和创新性工作如下:1.论文综述了微波光子学中光子发生微波、毫米波技术和ROF技术的研究现状,介绍了光子产生微波毫米波信号的一般方法和ROF技术的系统结构;理论分析了光外差技术和光纤光栅用于选频的基本原理。2.提出了一种基于新型双光栅选频结构的微波光子产生方法,并已申请发明专利(公开号:CN101382624)。采用混频滤波的方法产生高频毫米波信号,研究发现差频光波的相位对产生的毫米波功率影响很小,与差频波幅度成正比。经过建立下行链路模型分析,可实现数据速率2.5Gb/s的单信道无中继传输55km。3.理论分析了一种基于单边带调制产生微波毫米波的结构,并建立仿真模型;并对一种基于偏振模色散的毫米波产生方法中采用光源的参数和MZ干涉仪臂长差进行了分析。通过实验研究,验证证明了差频光波的相位关系对产生的RF电信号影响不大,和理论分析结论一致。4.提出了一种基于新型微波光子发生器的全双工ROF系统,并已申请发明专利(公开号:CN101420270)。采用单边带调制消除色散所致衰减,并采用去“码元时间”走离技术去除时间走离,比单边带调制格式延长了传输距离2.5～3倍。使用光栅选频的办法实现基站中心站的载波再用,简化基站结构,降低系统成本,可实现下行链路10Gb/s单信道无中继传输35km。更多还原

【Abstract】 With the development of communication technology,the demanding in relation to communication bandwidth,access speed,the quality of services available and the cost-effective communications networks have become increasingly.Radio Over Fiber(ROF) technology came into being to meets the urgent need for the the merits of a technology above.ROF system structure can be simplified with Microwave photon generator technology used to reduce the construction costs.ROF has very good prospects in expanding communication bandwidth.The primary achievements in this paper are as follows:1.First of all,the paper summarizes microwave photonic occurred millimeter wave technologies and ROF technology.Then emphatically analyzes some commonly methods of millimeter-wave generation and ROF technology system structure.And then the paper focuses on theoretical analysis of optical heterodyne and Fiber Bragg Grating technology with the basic principles of frequency-selective.2.A new microwave photon generator based on the new structure of double-grating frequency-selective method for the selection of the microwave photons was proposed,and applied for the patent of invention(Publication Number: CN101382624).High-frequency millimeter-wave signals could be got by using the method of mixing heterodyne then filtering.Electronic bottleneck can be broke through in this way.After analyzes of the downlink models,data rate 2.5Gb/s in single channel could be transmitted 55km without relay.3.A millimeter-wave microwave structures based on single sideband modulation was also studied in this paper.A theoretical analysis model and a simulation model have been given out.This paper studied a millimeter-wave generator based on polarization mode dispersion,especially parameters of light source and difference of MZ interferometer arms.The conclusion that the phase relationship of beat frequencies is not a influence factor for RF signal we got.4.This paper proposed a new full-duplex ROF system based on the design and analysis of a microwave photon generator,and applied for the patent of invention (Publication Number:CN101420270).The full-duplex ROF system suppresses attenuation caused by chroma dispersion by using single sideband modulation.By using the anti "symbol walk-off" technology,compare with SSB format, transmission distance was expanded by 2.5～3 times.Wavelength reusing for up-link and down-link was achieved by using grating frequency-selective approach.The scheme has been proved very effective through simulation analysis by simplifying base station and reducing the system cost.After analyzes of the downlink models, data rate 10Gb/s in single channel could be transmitted 35km without relay.更多还原