RoF系统中60GHz传输技术及光域微波信号处理技术研究
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摘要
RoF技术结合了光纤传输技术与无线接入技术的优势，将在未来宽带无线接入网络中具有重要的应用。本论文主要对60GHz RoF系统中信号的传输与接入技术和基于RoF技术框架的光域微波信号处理技术两方面内容进行了相关研究。
在60GHz RoF系统中信号的传输与接入技术方面，论文首先对60GHz RoF系统的低成本全双工传输技术进行了研究，提出一种基于光本振载波随路传输的低成本全双工系统方案并搭建了全双工60GHz RoF实验系统对其进行验证。实验中实现了622Mb/s的RoF信号通过20km光纤链路与50cm无线信道的无误码双向传输。之后论文顺应当前研究趋势，对60GHz RoF技术与有线接入技术的融合架构进行了研究并提出一种结合RoF与WDM-PON技术优势的有线无线混合宽带接入方案。随后搭建了可以同时传输基带信号和62.5GHz RoF信号的混合接入实验系统对该方案进行验证，实验中实现了数据率均为1.25Gb/s的有线与无线业务通过40km光纤链路的无误码混合接入。论文还研究了直接在光域调制产生并传输60GHz毫米波段矢量信号的方法，并提出了一种基于光矢量信号远端下变频的毫米波段矢量信号光学调制方案。在验证实验中，分别用两种方式调制产生了622Msymbols/s的64GHz波段8QAM和4QAM矢量信号并实现了其通过50km光纤链路和5m无线信道的无误码传输。
在基于RoF技术框架的光域微波信号处理技术方面，论文主要对应用范围较为广泛的光域微波信号放大与滤波技术进行了相关研究。文中首先提出了一种利用EDFA宽带高增益的优点在光域实现微波信号宽带放大的技术方案，对其建立了详细的理论模型并给出了实验验证。实验中实现了微波信号从10MHz到10GHz带宽范围内约为17dB的平坦增益。在光域微波信号滤波方面，论文重点研究了非相干MPF中系统参数与频率响应之间的内在关系，提出一种基于基本滤波单元重组的非相干MPF设计理论并给出了详细的设计流程。随后通过具体的设计实例给出了实验验证，实验中获得的MPF响应特性与理论设计结果非常吻合。
综上所述，本论文主要对RoF系统中60GHz信号的传输和接入技术以及光域微波信号处理技术进行了相关的理论和实验研究，取得的成果将在宽带数据接入网络、高频雷达系统和卫星通讯系统等领域中具有一定的应用价值。
The RoF technology which integrates the advantages of both the optical fibertransmission technology and the wireless access technology will play an important rolein future broadband wireless access networks. Several important transmission andaccess technologies in60GHz RoF systems as well as some microwave signal photonicprocessing technologies base on the RoF schemes are studied in this paper.
In the transmission and access technology part, the low-cost full-duplextransmission method for60GHz RoF systems is first studied and a novel low-costfull-duplex transmission scheme based on optical LO carrier remote distribution for60GHz RoF systems is proposed and experimentally verified. In the experiment,full-duplex RoF signals at the bit rate of622Mb/s are successfully transmitted through20km SMF link and50cm wireless channel at the error-free state. Then according topresent researching trends, the integration architecture of60GHz RoF and wired accesstechnologies is studied subsequently, and a broadband access scheme which integratesthe advantages of both the RoF and the WDM-PON technologies and merges wired andwireless services is proposed and experimentally verified. In the experiment, the RoFand baseband signals both at the bit rate of1.25b/s are successfully distributed through40km SMF link at the error-free state. The photonic generation and transmissionmethods of60GHz-band vector signals are also studied in this part and a novel photonicgeneration scheme based on optical vector signal down-conversion is proposed and andexperimentally verified. In the experiment, the64GHz-band8QAM and4QAM vectorsignals both at the data rate of622M symbols/s which are generated with two differentmodulation methods respectively are successfully distributed through50km SMF linkand5m wireless channel at the error-free state.
In the RoF based microwave photonic processing part, the microwave photonicamplification and filtering technologies which will be widely used are mainly discussed.A microwave photonic amplification scheme which takes advantage of the broadbandgain of EDFA is first studied, and a detail model of the amplification principle is givenwhich is then experimentally verified. Stable broadband gain of about17dB for themicrowave signals from10MHz to10GHz is obtained in the experiment. As to the microwave photonic filtering, the intrinsic relationship between the system parametersand the frequency response of the incoherent MPF is studied and a novel designingmethod for incoherent MPF based on basic filtering cell recombination is proposed. Theproposed method is then experimentally verified with a practical designing example,and the frequency response of the MPF measured in the experiment accords with thetheoretically designing result well.
In a word, several important transmission and access technologies in60GHz RoFsystems as well as some RoF based microwave signal photonic processing technologiesare theoretically and experimentally studied in this paper. The correspondingachievements will have some value in related fields such broadband access networks,high frequency radar systems and satellite communication systems.
在60GHz RoF系统中信号的传输与接入技术方面，论文首先对60GHz RoF系统的低成本全双工传输技术进行了研究，提出一种基于光本振载波随路传输的低成本全双工系统方案并搭建了全双工60GHz RoF实验系统对其进行验证。实验中实现了622Mb/s的RoF信号通过20km光纤链路与50cm无线信道的无误码双向传输。之后论文顺应当前研究趋势，对60GHz RoF技术与有线接入技术的融合架构进行了研究并提出一种结合RoF与WDM-PON技术优势的有线无线混合宽带接入方案。随后搭建了可以同时传输基带信号和62.5GHz RoF信号的混合接入实验系统对该方案进行验证，实验中实现了数据率均为1.25Gb/s的有线与无线业务通过40km光纤链路的无误码混合接入。论文还研究了直接在光域调制产生并传输60GHz毫米波段矢量信号的方法，并提出了一种基于光矢量信号远端下变频的毫米波段矢量信号光学调制方案。在验证实验中，分别用两种方式调制产生了622Msymbols/s的64GHz波段8QAM和4QAM矢量信号并实现了其通过50km光纤链路和5m无线信道的无误码传输。
在基于RoF技术框架的光域微波信号处理技术方面，论文主要对应用范围较为广泛的光域微波信号放大与滤波技术进行了相关研究。文中首先提出了一种利用EDFA宽带高增益的优点在光域实现微波信号宽带放大的技术方案，对其建立了详细的理论模型并给出了实验验证。实验中实现了微波信号从10MHz到10GHz带宽范围内约为17dB的平坦增益。在光域微波信号滤波方面，论文重点研究了非相干MPF中系统参数与频率响应之间的内在关系，提出一种基于基本滤波单元重组的非相干MPF设计理论并给出了详细的设计流程。随后通过具体的设计实例给出了实验验证，实验中获得的MPF响应特性与理论设计结果非常吻合。
综上所述，本论文主要对RoF系统中60GHz信号的传输和接入技术以及光域微波信号处理技术进行了相关的理论和实验研究，取得的成果将在宽带数据接入网络、高频雷达系统和卫星通讯系统等领域中具有一定的应用价值。
The RoF technology which integrates the advantages of both the optical fibertransmission technology and the wireless access technology will play an important rolein future broadband wireless access networks. Several important transmission andaccess technologies in60GHz RoF systems as well as some microwave signal photonicprocessing technologies base on the RoF schemes are studied in this paper.
In the transmission and access technology part, the low-cost full-duplextransmission method for60GHz RoF systems is first studied and a novel low-costfull-duplex transmission scheme based on optical LO carrier remote distribution for60GHz RoF systems is proposed and experimentally verified. In the experiment,full-duplex RoF signals at the bit rate of622Mb/s are successfully transmitted through20km SMF link and50cm wireless channel at the error-free state. Then according topresent researching trends, the integration architecture of60GHz RoF and wired accesstechnologies is studied subsequently, and a broadband access scheme which integratesthe advantages of both the RoF and the WDM-PON technologies and merges wired andwireless services is proposed and experimentally verified. In the experiment, the RoFand baseband signals both at the bit rate of1.25b/s are successfully distributed through40km SMF link at the error-free state. The photonic generation and transmissionmethods of60GHz-band vector signals are also studied in this part and a novel photonicgeneration scheme based on optical vector signal down-conversion is proposed and andexperimentally verified. In the experiment, the64GHz-band8QAM and4QAM vectorsignals both at the data rate of622M symbols/s which are generated with two differentmodulation methods respectively are successfully distributed through50km SMF linkand5m wireless channel at the error-free state.
In the RoF based microwave photonic processing part, the microwave photonicamplification and filtering technologies which will be widely used are mainly discussed.A microwave photonic amplification scheme which takes advantage of the broadbandgain of EDFA is first studied, and a detail model of the amplification principle is givenwhich is then experimentally verified. Stable broadband gain of about17dB for themicrowave signals from10MHz to10GHz is obtained in the experiment. As to the microwave photonic filtering, the intrinsic relationship between the system parametersand the frequency response of the incoherent MPF is studied and a novel designingmethod for incoherent MPF based on basic filtering cell recombination is proposed. Theproposed method is then experimentally verified with a practical designing example,and the frequency response of the MPF measured in the experiment accords with thetheoretically designing result well.
In a word, several important transmission and access technologies in60GHz RoFsystems as well as some RoF based microwave signal photonic processing technologiesare theoretically and experimentally studied in this paper. The correspondingachievements will have some value in related fields such broadband access networks,high frequency radar systems and satellite communication systems.
引文
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