【摘要】：微波光子學是一門集合了微波信號處理與光學方法的新興交叉學科。微波光子濾波器作為微波光子學的重要應用方向,克服了傳統(tǒng)濾波器中的電子瓶頸,可以直接在光域?qū)ι漕l信號進行處理,很大程度上簡化了設備的結(jié)構(gòu)。微波光子濾波器除了具有高帶寬、低損耗和不受電磁干擾的優(yōu)點外,還具有可調(diào)諧與可重構(gòu)特性。本論文主要在理論和實驗上,深入研究了基于多波長光纖激光器的非相干微波光子濾波器的實現(xiàn)。主要內(nèi)容及創(chuàng)新點如下:(1)介紹了微波光子學與微波光子濾波器的基本原理與應用,按照不同的特點對于微波光子濾波器進行分類,總結(jié)了微波光子濾波器的近幾年的國內(nèi)外研究現(xiàn)狀,針對能夠利用于微波光子濾波器的多波長光纖激光器原理進行了概述。(2)闡述了比較廣泛使用的微波光子濾波器的基本結(jié)構(gòu)與原理,對于光纖激光器中兩種梳狀濾波器(MZ干涉儀與Sagnac干涉儀)進行了理論分析與數(shù)值仿真。(3)提出了一種基于多波長光纖激光器與MZ干涉儀的可調(diào)諧與可重構(gòu)微波光子濾波器,其可調(diào)諧性基于MZ干涉儀傳輸譜的傾斜濾波功能,改變MZ干涉儀的傳輸譜周期實現(xiàn)不同波長激光的功率改變,進而實現(xiàn)抽頭系數(shù)變化。同時激光器采用Lyot-Sagnac梳狀濾波器,具有可調(diào)的波長間隔,能夠?qū)崿F(xiàn)濾波器通帶中心頻率的調(diào)諧與通帶的重構(gòu)。(4)提出了一種基于多波長光纖激光器結(jié)合啁啾布拉格光柵與布拉格光柵陣列的微波光子濾波器,利用啁啾布拉格光柵的特性實現(xiàn)了濾波器自由光譜范圍的提高,同時保證射頻響應的主旁瓣抑制比保持不變。還分析了對于不同的多波長激光器輸出譜施以不同形狀的窗函數(shù)進行切趾時濾波器的參數(shù)變化情況。(5)進行了微波光子濾波器系統(tǒng)的實驗,比較了不同延時光纖長度對于射頻響應通帶中心頻率的影響,實驗利用兩種不同種類的多波長光纖激光器得到了相應的濾波效果,通過調(diào)節(jié)激光器的輸出得到了可調(diào)諧與可重構(gòu)的射頻響應。
[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.
【學位授予單位】：天津理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN713

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相關期刊論文 前1條

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本文編號：2345848