可调谐带通微波光子滤波器的研究

发布时间：2018-02-09 05:49

本文关键词： 微波光子滤波器负系数跳频相位调制单通带受激布里渊散射　出处：《天津理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着当代通信学科在各个领域的广泛应用,人们对于通信技术的依赖程度也越来越高。而微波光子学是一门将微波信号应用于光信号处理单元的交叉型学科,其在光纤通信网络,宽带接入网,传感网等领域都具有广阔的应用前景,因而近年来得到了快速发展。微波光子滤波器通过集成技术将微波器件和光器件进行结合,让微波信号的处理延伸至光域。这样既摆脱了传统单一微波通信的不足,又保留了光纤通信高带宽、高懫样率、低损耗和抗电磁干扰等优点。另一方面,微波光子滤波器的简易可调谐是其一大亮点,在不改变结构的情况下可对不同频段的微波信号进行滤波处理。本论文主要论述了可调谐带通微波光子滤波器的三种设计方案,仿真模拟和相关实验验证了可调谐带通微波光子滤波器的滤波特性。主要研究内容如下:第一,论文首先介绍了微波光子滤波器的研究背景,工作原理以及近年来国内外研究现状。论述了由相位调制器和强度调制器调制微波光信号的基础理论,阐明了基于单模光纤和受激布里渊散射效应实现的PM-IM转换原理。第二,我们采用高斯宽谱光源作为光载波,利用MZI的连续切割特性,使得光载波抽头呈现正弦函数的连续分布。据此提出了一种全新的设计方案——基于MZI的单通带可调谐微波光子滤波器。该滤波器调谐范围有一定程度的增加,即所设计的结构有效地提高了滤波器的通带调谐范围。第三,设计了高Q值跳频带通微波光子滤波器方案。分析了级联滤波器跳频特性随相关量的变化情况。结论显示,基于该原理的微波光子滤波器结构,只要合理设计保偏光纤的长度和段数,改变偏振控制器状态即可实现滤波器中心频率的跳跃。第四,利用单模光纤中的受激布里渊散射效应打破相位调制幅度平衡,完成PM-IM。经探测器检测,所设计的滤波器可实现从1.2G-9.7GHz的自由调谐,具有很好的调谐特性。
[Abstract]:With the wide application of modern communication science in various fields, people rely more and more on communication technology, and microwave photonics is an interdisciplinary subject in which microwave signal is applied to optical signal processing unit. It has a wide application prospect in optical fiber communication network, broadband access network, sensor network and so on, so it has been developed rapidly in recent years. Microwave photonic filter combines microwave device and optical device through integrated technology. The microwave signal processing is extended to the optical domain. This not only eliminates the shortcomings of traditional single microwave communication, but also preserves the advantages of high bandwidth, high sample rate, low loss and anti-electromagnetic interference in optical fiber communication. The simple tunable microwave photonic filter is one of its bright spots. Microwave signal in different frequency band can be filtered without changing the structure. In this paper, three design schemes of tunable band-pass microwave photonic filter are discussed. Simulation and related experiments verify the filter characteristics of tunable band-pass microwave photonic filter. The main research contents are as follows: firstly, the background of microwave photonic filter is introduced. The basic theory of microwave optical signal modulated by phase modulator and intensity modulator is discussed, and the principle of PM-IM conversion based on single mode optical fiber and stimulated Brillouin scattering effect is expounded. We use Gao Si wide spectrum light source as optical carrier, using the continuous cutting characteristic of MZI. The optical carrier tap presents the continuous distribution of sinusoidal function. Based on this, a new design scheme, single pass tunable microwave photonic filter based on MZI, is proposed. The tuning range of the filter is increased to a certain extent. That is to say, the designed structure can effectively improve the bandpass tuning range of the filter. Thirdly, the scheme of high Q band-hopping bandpass microwave photonic filter is designed. The frequency hopping characteristics of cascaded filter are analyzed with the change of correlation quantity. The results show that, The structure of microwave photonic filter based on this principle, as long as the length and the number of segments of polarization maintaining fiber are reasonably designed and the state of polarization controller is changed, the central frequency of filter can be hopped. 4th, The phase modulation amplitude balance is broken by the stimulated Brillouin scattering effect in single-mode optical fiber and the PM-IM.The detector detects that the filter can be tuned freely from 1.2G-9.7GHz and has good tuning characteristics.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713

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