基于多波长光源的微波光子滤波器的理论与实验研究
发布时间：2018-11-20 19:59
【摘要】：微波光子学是一门集合了微波信号处理与光学方法的新兴交叉学科。微波光子滤波器作为微波光子学的重要应用方向,克服了传统滤波器中的电子瓶颈,可以直接在光域对射频信号进行处理,很大程度上简化了设备的结构。微波光子滤波器除了具有高带宽、低损耗和不受电磁干扰的优点外,还具有可调谐与可重构特性。本论文主要在理论和实验上,深入研究了基于多波长光纤激光器的非相干微波光子滤波器的实现。主要内容及创新点如下:(1)介绍了微波光子学与微波光子滤波器的基本原理与应用,按照不同的特点对于微波光子滤波器进行分类,总结了微波光子滤波器的近几年的国内外研究现状,针对能够利用于微波光子滤波器的多波长光纤激光器原理进行了概述。(2)阐述了比较广泛使用的微波光子滤波器的基本结构与原理,对于光纤激光器中两种梳状滤波器(MZ干涉仪与Sagnac干涉仪)进行了理论分析与数值仿真。(3)提出了一种基于多波长光纤激光器与MZ干涉仪的可调谐与可重构微波光子滤波器,其可调谐性基于MZ干涉仪传输谱的倾斜滤波功能,改变MZ干涉仪的传输谱周期实现不同波长激光的功率改变,进而实现抽头系数变化。同时激光器采用Lyot-Sagnac梳状滤波器,具有可调的波长间隔,能够实现滤波器通带中心频率的调谐与通带的重构。(4)提出了一种基于多波长光纤激光器结合啁啾布拉格光栅与布拉格光栅阵列的微波光子滤波器,利用啁啾布拉格光栅的特性实现了滤波器自由光谱范围的提高,同时保证射频响应的主旁瓣抑制比保持不变。还分析了对于不同的多波长激光器输出谱施以不同形状的窗函数进行切趾时滤波器的参数变化情况。(5)进行了微波光子滤波器系统的实验,比较了不同延时光纤长度对于射频响应通带中心频率的影响,实验利用两种不同种类的多波长光纤激光器得到了相应的滤波效果,通过调节激光器的输出得到了可调谐与可重构的射频响应。
[Abstract]:Microwave photonics is a new interdisciplinary subject which combines microwave signal processing and optical methods. As an important application direction of microwave photonics, microwave photonic filter overcomes the electronic bottleneck in traditional filter, and can process RF signal directly in optical domain, which greatly simplifies the structure of the equipment. In addition to the advantages of high bandwidth, low loss and no electromagnetic interference, microwave photonic filters also have tunable and reconfigurable properties. In this thesis, the realization of incoherent microwave photonic filter based on multi-wavelength fiber laser is studied theoretically and experimentally. The main contents and innovations are as follows: (1) the basic principles and applications of microwave photonics and microwave photonic filters are introduced, and the microwave photonic filters are classified according to different characteristics. The research status of microwave photonic filter in recent years is summarized. The principle of multi-wavelength fiber laser which can be used in microwave photonic filter is summarized. (2) the basic structure and principle of microwave photonic filter are described. The theoretical analysis and numerical simulation of two comb filters (MZ interferometer and Sagnac interferometer) in fiber laser are presented. (3) A tunable and reconfigurable optical fiber laser based on multi-wavelength fiber laser and MZ interferometer is proposed. Microwave photonic filter, Its tunability is based on the tilting filtering function of the transmission spectrum of MZ interferometer, which changes the transmission spectrum period of MZ interferometer to realize the power change of different wavelength laser, and then realizes the change of tap coefficient. At the same time, the laser adopts Lyot-Sagnac comb filter, which has adjustable wavelength interval. It can realize the tuning of the passband center frequency and the reconstruction of the passband. (4) A microwave photonic filter based on a multi-wavelength fiber laser combined with a chirped Bragg grating and a Bragg grating array is proposed. The free spectrum range of the filter is improved by using the chirped Bragg grating and the main sidelobe rejection ratio of the RF response is kept constant. The change of filter parameters when different output spectrum of multi-wavelength laser is applied to different shape window function is also analyzed. (5) the experiment of microwave photonic filter system is carried out. The effects of different delay fiber lengths on the central frequency of RF response passband are compared. Two different kinds of multi-wavelength fiber lasers are used to obtain the corresponding filtering effect. Tunable and reconfigurable RF responses are obtained by adjusting the output of the laser.
【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
本文编号：2345848
[Abstract]:Microwave photonics is a new interdisciplinary subject which combines microwave signal processing and optical methods. As an important application direction of microwave photonics, microwave photonic filter overcomes the electronic bottleneck in traditional filter, and can process RF signal directly in optical domain, which greatly simplifies the structure of the equipment. In addition to the advantages of high bandwidth, low loss and no electromagnetic interference, microwave photonic filters also have tunable and reconfigurable properties. In this thesis, the realization of incoherent microwave photonic filter based on multi-wavelength fiber laser is studied theoretically and experimentally. The main contents and innovations are as follows: (1) the basic principles and applications of microwave photonics and microwave photonic filters are introduced, and the microwave photonic filters are classified according to different characteristics. The research status of microwave photonic filter in recent years is summarized. The principle of multi-wavelength fiber laser which can be used in microwave photonic filter is summarized. (2) the basic structure and principle of microwave photonic filter are described. The theoretical analysis and numerical simulation of two comb filters (MZ interferometer and Sagnac interferometer) in fiber laser are presented. (3) A tunable and reconfigurable optical fiber laser based on multi-wavelength fiber laser and MZ interferometer is proposed. Microwave photonic filter, Its tunability is based on the tilting filtering function of the transmission spectrum of MZ interferometer, which changes the transmission spectrum period of MZ interferometer to realize the power change of different wavelength laser, and then realizes the change of tap coefficient. At the same time, the laser adopts Lyot-Sagnac comb filter, which has adjustable wavelength interval. It can realize the tuning of the passband center frequency and the reconstruction of the passband. (4) A microwave photonic filter based on a multi-wavelength fiber laser combined with a chirped Bragg grating and a Bragg grating array is proposed. The free spectrum range of the filter is improved by using the chirped Bragg grating and the main sidelobe rejection ratio of the RF response is kept constant. The change of filter parameters when different output spectrum of multi-wavelength laser is applied to different shape window function is also analyzed. (5) the experiment of microwave photonic filter system is carried out. The effects of different delay fiber lengths on the central frequency of RF response passband are compared. Two different kinds of multi-wavelength fiber lasers are used to obtain the corresponding filtering effect. Tunable and reconfigurable RF responses are obtained by adjusting the output of the laser.
【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
【参考文献】
相关期刊论文 前1条
1 刘艳格;冯新焕;董孝义;;室温稳定多波长光纤激光器技术的研究新进展[J];中国激光;2007年07期
，本文编号：2345848
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