基于啁啾相移光纤光栅的宽调谐光电振荡器的研究

发布时间：2018-05-10 08:58

本文选题：光电振荡器 + 啁啾相移光纤光栅　；参考：《南京邮电大学》2017年硕士论文

【摘要】：随着人类进入信息时代,人们对微波信号质量的要求越来越高,在这种情况下,光电振荡器(OEO)作为一种理想微波信号发生源,受到了越来越多的关注与研究。与传统微波振荡器相比,OEO产生的微波信号具有宽带宽、可调谐范围大、抗电磁干扰以及高频谱纯度等优点,所以在现代的应用非常广泛。为了扩大OEO的频率可调谐范围,本文设计了一种基于啁啾相移光纤布拉格光栅(Chirped PS-FBG)的可调谐OEO。首先对相移光纤布拉格光栅(PS-FBG)的反射谱和基于PS-FBG的可调谐范围进行了理论和仿真研究,然后分析了Chirped PS-FBG的反射谱和基于Chirped PS-FBG的可调谐范围。通过仿真,基于PS-FBG的可调谐范围达到了5GHz-55GHz,边带抑制比达到了30dB。基于Chirped PS-FBG的OEO频率可调谐范围被扩大到了5GHz-155GHz,边带抑制比也提高到了40dB。大大提高了OEO的可调谐范围。对基于Chirped PS-FBG可调谐OEO产生的微波信号的噪声特性也进行了详细的研究,本文在较小频率的范围内,对与频率有关的噪声性能模型进行了严谨的理论推导,重点分析了一种改进的噪声理论模型,通过仿真发现改进后的噪声模型更能全面的反映OEO系统中噪声性能。
[Abstract]:As human beings enter the information age, the quality of microwave signals is becoming more and more demanding. In this case, the optoelectronic oscillator (OEO), as an ideal source of microwave signals, has been paid more and more attention and research. Compared with the traditional microwave oscillator, the microwave signal produced by OO has the advantages of wide bandwidth, wide tunable range, anti-electromagnetic interference and high spectral purity, so it is widely used in modern times. In order to enlarge the frequency tunable range of OEO, a tunable OEO based on chirped phase-shifted fiber Bragg grating (chirped PS-FBG) is designed. The reflection spectrum of phase-shifted fiber Bragg grating (PS-FBG) and the tunable range based on PS-FBG are studied theoretically and simulated. Then the reflection spectrum of Chirped PS-FBG and the tunable range based on Chirped PS-FBG are analyzed. The simulation results show that the tunable range based on PS-FBG is 5 GHz to 55 GHz, and the sideband rejection ratio is 30 dB. The tunable range of OEO frequency based on Chirped PS-FBG is extended to 5 GHz ~ 155 GHz, and the sideband suppression ratio is increased to 40 dB. The tunable range of OEO is greatly improved. The noise characteristics of microwave signal based on Chirped PS-FBG tunable OEO are also studied in detail. In the range of smaller frequency, the noise performance model related to frequency is deduced in this paper. An improved noise theory model is analyzed. The simulation results show that the improved noise model can better reflect the noise performance of OEO system.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN753.2

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