基于光学频率梳和受激布里渊散射的微波光子滤波器研究

发布时间：2018-05-09 15:18

本文选题：微波光子滤波器 + 可重构性　；参考：《哈尔滨工业大学》2014年硕士论文

【摘要】：随着微波通信技术的发展，对于微波信号的高频传输和宽带通信的需求越来越高。由于电子技术的限制，传统的微波滤波电路结构复杂，价格昂贵。微波光子滤波器是微波技术和光学技术结合的产物，可以将微波信号加载到光域中进行光学处理，最后通过光电探测器转换到电域中形成微波。微波光子滤波器的优点有滤波频段高，宽带宽，体积小，抗电磁干扰，易于接入光纤，可以实现一些电子微波滤波器所不能实现的功能。本文提出一种基于光学频率梳和受激布里渊散射的微波光子滤波器，该微波光子滤波器具有可重构的单通带，且通带可大范围稳定地调谐。具体内容如下：首先，理论分析基于光学频率梳和受激布里渊散射的微波光子滤波器的数学模型，，研究了频率梳和布里渊增益谱的特征，推导了频率梳的布里渊放大传递函数，提出了通过增加频率梳条数和频率间隔展宽微波光子滤波器通带的方法。其次，搭建了基于光学频率梳和受激布里渊散射的微波光子滤波器，测量了频率梳光谱、布里渊增益谱和微波光子滤波器通带，验证了微波光子滤波器通带的可重构性。研究了微波光子滤波器的可调谐性，包括调谐范围、形状因子和带外抑制能力等因素。讨论了微波光子滤波器通带的特征，包括顶部波动、幅值阶梯下降、底部突起等现象，研究了高阶边带、泵浦光功率和矢量网络分析仪输出功率等影响微波光子滤波器带外抑制能力的因素。最后，实验结果显示，基于频率梳和受激布里渊散射微波光子滤波器的3-dB带宽实现了从34.5MHz到306.8MHz之间的重构，通带调谐范围为3GHz到20GHz，带外抑制能力可达到40dB。
[Abstract]:With the development of microwave communication technology, the demand for high frequency transmission and broadband communication of microwave signal is increasing. Due to the limitation of electronic technology, the structure of traditional microwave filter circuit is complex and expensive. Microwave photonic filter is a combination of microwave technology and optical technology. Microwave signal can be loaded into optical domain for optical processing. The advantages of microwave photonic filter are high frequency band, wide bandwidth, small volume, anti-electromagnetic interference, easy access to optical fiber, and can realize some functions which can not be realized by electronic microwave filter. In this paper, a microwave photonic filter based on optical frequency comb and stimulated Brillouin scattering is proposed. The microwave photonic filter has a reconfigurable single pass band and can be tuned stably in a large range. The details are as follows: Firstly, the mathematical model of microwave photonic filter based on optical frequency comb and stimulated Brillouin scattering is analyzed theoretically, the characteristics of frequency comb and Brillouin gain spectrum are studied, and the Brillouin amplification transfer function of frequency comb is deduced. A method to widen the pass band of microwave photonic filter by increasing the number of comb and frequency interval is presented. Secondly, a microwave photonic filter based on optical frequency comb and stimulated Brillouin scattering is built. The spectrum of frequency comb, Brillouin gain spectrum and pass band of microwave photonic filter are measured, and the reconfiguration of pass band of microwave photonic filter is verified. The tunability of microwave photonic filter is studied, including tuning range, shape factor and outband suppression ability. The characteristics of the pass band of microwave photonic filter are discussed, including the top wave, the drop of the amplitude step, the bottom protuberance, and the high order sideband. The pump power and the output power of the vector network analyzer affect the off-band suppression ability of microwave photonic filter. Finally, the experimental results show that the 3-dB bandwidth based on the frequency comb and stimulated Brillouin scattering microwave photonic filter can be reconstructed from 34.5MHz to 306.8MHz. The bandpass tuning range is from 3GHz to 20 GHz, and the out-of-band suppression ability can reach 40 dB.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN925;TN713

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