摘要
因随着卫星通信系统向高频段、大带宽、多通道方向发展,传统微波技术在高频微波信号的产生、馈送、交换等方面越来越多受到电子瓶颈的限制,而微波光子学作为一门淅兴学科可解决上述问题,对星上高性能集中式本振信号产生及多路馈送技术进行了研究。研究了两种高频微波本振信号产生方法,用低频射频信号或无需射频信号输入即可生成高频的微波本振信号,大幅降低系统对光电器件带宽的要求。一种是基于两个级联马赫-曾德尔(MZ)调制器的高频微波信号产生方法,可生成八倍频微波信号,调节输入射频信号频率即可调整生成微波信号的频率,系统可调谐性较好。另一种是基于光电振荡器的微波信号生成方法,通过设置偏振调制器、MZ调制器及移相器的参数,可实现对光电振荡器环路谐振信号的四、六和八倍频。分析了高频微波本振信号光纤馈送中损耗和色散的影响,发现两者对星上微波本振信号的馈送影响很小,且星上馈送系统的体积和重量可明显降低。研究将为微波光子技术用于星上载荷提供理论基础和技术支撑。
With the rapid development of satellite communication system towards high frequency,large bandwidth and multichannel,traditional microwave technology has been increasingly restricted by the electronic bottleneck in generating,distributing and switching of high frequency microwave signals.Microwave photonic is a feasible technique to solve the problems above.Optical generation and distribution of high quality centralized local oscillator were studied in this paper.Two high frequency microwave signal generation methods were researched.By using low frequency RF signal or even using no RF signal,high frequency microwave was generated,which greatly reduced the bandwidth requirement of the optical and electrical components.One was to generate frequency octupling microwave signal based on two cascaded MZ modulators.The frequency of the generated signal could be regulated by adjusting the frequency of the input RF signal.The system had good frequency tunability.The other was to generate microwave signal based on optoelectronic oscillator.By setting the parameters of polarizing modulator,Mach-Zehnder modulator and phase shifter,frequency quardrupling,frequency sextupling or frequency octupling microwave signal with respect to the resonance signal in optoelectronic oscillator loop could be generated.The influence of fiber loss and dispersion in high frequency microwave signals distribution were also analyzed.It found that the influence was very small,and the volume and weight could be greatly reduced by fiber distribution in satellite.The research provided the theoretical basis and technique support for application of microwave photonic in satellite.
出处
《上海航天》
2016年第6期38-43,共6页
Aerospace Shanghai
基金
国家自然科学基金资助(61671305)
关键词
卫星系统
微波光子学
高频微波信号
光电振荡器
马赫-曾德尔调制器
微波信号光学生成
微波信号光学馈送
相位噪声
Satellite system
Microwave photonics
High frequency microwave signals
Optoelectronic oscillator
Mach-Zehnder modulator
Photonic generation of microwave signal
Photonic distribution of microwave signal
Phase noise
