發(fā)布時間：2018-04-23 16:09

  本文選題：微波光子學 + 微波信號產(chǎn)生��； 參考：《西南交通大學》2016年博士論文

【摘要】：隨著現(xiàn)代信息技術(shù)的發(fā)展,低頻段的微波頻帶資源已難以滿足人們生產(chǎn)生活的需求,高速增長的無線數(shù)據(jù)流量對微波載頻提出了更高的要求。但是,基于傳統(tǒng)電子學的方法產(chǎn)生、傳輸和處理高頻微波信號,面臨著電子瓶頸等問題。在此背景下,研究光與微波相互作用的微波光子學,吸引了眾多學術(shù)界和工業(yè)界人士的關(guān)注。由于光子學技術(shù)具有大帶寬、低傳輸損耗、抗電磁干擾等優(yōu)點,利用光子學手段來產(chǎn)生、傳輸和處理高頻段微波信號,無疑是解決高頻段微波使用所面臨問題的一種理想方案。本文將圍繞微波光子學中的一個主要研究方向——微波信號的光子學產(chǎn)生,以基于電光外調(diào)制的寬帶微波光子信號生成技術(shù)研究為選題,旨在探索新的低相位噪聲單頻微波信號和任意波形微波信號的產(chǎn)生方法,提高微波光子信號產(chǎn)生系統(tǒng)的性能。本文分別研究了基于光電振蕩器(OEO)的低相位噪聲單頻微波信號產(chǎn)生技術(shù)和基于外調(diào)制的任意波形微波信號產(chǎn)生技術(shù)。首先,在基于OEO的單頻微波信號產(chǎn)生方面,詳細研究了OEO的幅值特性與調(diào)制系數(shù)可調(diào)諧性,在此基礎(chǔ)上,提出了一種基于OEO的高速光脈沖產(chǎn)生方案；同時,探討了OEO的頻率調(diào)諧、邊模抑制和高頻輸出等問題的解決方法,設(shè)計了兩種新型的OEO方案。其次,在基于外調(diào)制的任意波形微波信號產(chǎn)生方面,詳細研究了任意波形微波信號的精細生成與快速調(diào)諧的實現(xiàn)方法,分別提出了一種大信號電光調(diào)制下的啁啾微波脈沖產(chǎn)生方案和一種基于非線性調(diào)制的三角形微波信號產(chǎn)生方案。本文的主要研究內(nèi)容和成果如下：(1)推導(dǎo)了可用于描述OEO振蕩過程的迭代方程組。通過數(shù)值仿真,詳細研究了OEO從起振開始,振蕩幅值和環(huán)路增益所經(jīng)歷的變化過程；分析了OEO能夠維持穩(wěn)定振蕩的開環(huán)增益條件；得到了由OEO直接產(chǎn)生的微波信號的最大幅值。在上述分析基礎(chǔ)上,估算了OEO中調(diào)制器的調(diào)制系數(shù)的可調(diào)諧范圍；同時,探討了工作在特定調(diào)制系數(shù)下的OEO在信號產(chǎn)生中的新應(yīng)用,設(shè)計了一種基于OEO的高速光脈沖信號產(chǎn)生方案,并通過實驗產(chǎn)生了歸零碼(RZ)和抑制載波歸零碼(CS-RZ)光脈沖信號。(2)設(shè)計了一種基于級聯(lián)光纖循環(huán)延時線(RDL)結(jié)構(gòu)的多環(huán)OEO。分析了級聯(lián)RDL結(jié)構(gòu)的系統(tǒng)響應(yīng)。應(yīng)用級聯(lián)RDL結(jié)構(gòu)作為OEO的儲能器件,同時執(zhí)行OEO的模式選擇功能,可以產(chǎn)生頻率等于兩個RDL的自由頻譜范圍(FSR)最小公倍數(shù)的微波信號。這樣一個多環(huán)OEO方案,不僅可以有效增大振蕩模式間隔,提高OEO的邊模抑制效果,還可以通過電光、熱光效應(yīng)實現(xiàn)靈活的調(diào)諧。(3)設(shè)計了一種基于光載波布里淵處理的倍頻OEO。在小信號調(diào)制下,利用Po1M來產(chǎn)生抑制載波雙邊帶(DSB-SC)信號。對DSB-SC信號實施光電轉(zhuǎn)換,產(chǎn)生了二倍頻微波信號。為了維持OEO的穩(wěn)定振蕩,利用布里淵增益放大被抑制的載波,完成DSB-SC信號到雙邊帶(DSB)信號的轉(zhuǎn)變,從而產(chǎn)生基頻微波信號。這一方案可以使OEO在采用低頻電子器件的前提下,產(chǎn)生更高頻率的微波信號。(4)提出了一種大信號電光調(diào)制下的啁啾微波脈沖信號產(chǎn)生方案。利用強度調(diào)制器構(gòu)建脈沖型強度時域開關(guān),在時域上選取兩個光相位調(diào)制信號的不同相位調(diào)制區(qū)間,并對選出的相位調(diào)制區(qū)間內(nèi)的光信號進行拍頻,實現(xiàn)了啁啾微波脈沖信號的產(chǎn)生。由于生成的啁啾微波脈沖的中心頻率、啁啾率和脈沖重復(fù)頻率等參數(shù),直接決定于調(diào)制器外加微波信號的幅度、頻率和初始相位。因此,這一方法可以實現(xiàn)對生成的啁啾微波脈沖信號的參數(shù)的精細調(diào)控。(5)提出了一種脈沖重復(fù)頻率可簡易調(diào)諧的三角形微波脈沖信號產(chǎn)生方案。在大信號調(diào)制下,利用工作于最小傳輸點的強度調(diào)制器(IM)和光帶通濾波器(OBPF)來產(chǎn)生正奇次階邊帶信號。應(yīng)用光載波布里淵處理技術(shù),控制被抑制的光載波的幅值和相位,最終通過拍頻實現(xiàn)了三角形微波脈沖信號的產(chǎn)生。分析了布里淵增益、布里淵非線性相移和載波抑制比對波形的影響,實驗證明了上述方案的有效性和簡易的調(diào)諧性。綜上所述,本論文重點研究了寬帶微波光子信號的產(chǎn)生技術(shù)�；谛滦徒Y(jié)構(gòu)的OEO和外調(diào)制技術(shù),分別實現(xiàn)了高頻/寬帶的單頻、啁啾和三角形微波信號的光子學產(chǎn)生,在通信系統(tǒng)、脈沖雷達、電子測量等領(lǐng)域具有重要應(yīng)用。此外,基于光子集成技術(shù)提高系統(tǒng)的穩(wěn)定性和實用性,還需要被進一步探討和研究。
[Abstract]:With the development of modern information technology, the microwave frequency band resources in the low frequency section are difficult to meet the needs of people's production and life. The high speed increasing wireless data flow has put forward higher requirements for the microwave carrier frequency. However, the transmission and processing of high frequency microwave signals are faced with the problems of electronic bottlenecks, such as the electronic bottleneck, and so on. Under the view, microwave photonics that studies the interaction of light and microwave attracts the attention of many academics and industry people. Because the photonics technology has the advantages of large bandwidth, low transmission loss and anti electromagnetic interference, the use of photonics to transmit and process the high frequency microwave signals is undoubtedly a solution to the use of high frequency microwave. An ideal solution for the problem. This paper will focus on one of the main research directions in microwave photonics, the photonics of microwave signals, and the research of broadband microwave photon signal generation based on electrooptic modulation. The aim is to explore new methods of producing low phase noise single frequency microwave signal and arbitrary waveform microwave signal. The performance of the microwave photon signal generation system is improved. In this paper, the low phase noise single frequency microwave signal generation technology based on the photoelectric oscillator (OEO) and the arbitrary waveform microwave signal generation technology based on the external modulation are respectively studied. First, the amplitude characteristic and modulation system of the OEO are studied in detail in the single frequency microwave signal based on the OEO. On the basis of this, a high speed optical pulse generation scheme based on OEO is proposed. At the same time, two new OEO schemes are designed to solve the problem of frequency tuning, edge mode suppression and high frequency output of OEO. Secondly, an arbitrary wave is studied in detail in the production of microwave signal based on external modulation. A scheme of chirped microwave pulse generation in large signal electro-optic modulation and a nonlinear modulation based triangular microwave signal generation scheme are proposed, respectively. The main contents and results of this paper are as follows: (1) the iteration of the OEO oscillation process is derived. By numerical simulation, the change process of OEO from starting vibration, oscillation amplitude and loop gain is studied in detail. The open loop gain conditions of OEO can maintain stable oscillation, and the maximum amplitude of the microwave signal produced directly by OEO is obtained. On the basis of the above analysis, the modulation system of the modulator in OEO is estimated. At the same time, the new application of OEO in signal generation under specific modulation coefficients is discussed. A high speed optical pulse signal generation scheme based on OEO is designed, and the zero code (RZ) and suppression carrier return zero code (CS-RZ) optical pulse signal is produced by experiments. (2) a cascade fiber loop extension is designed. The multi loop OEO. of the time line (RDL) structure is used to analyze the system response of the cascaded RDL structure. The cascaded RDL structure is used as the energy storage device of OEO, and the mode selection function of the OEO is executed at the same time, and the microwave signals with the frequency equal to two RDL free spectrum range (FSR) minimum common multiple can be generated. Swing mode interval, improve the edge mode suppression effect of OEO, and can also achieve flexible tuning by electro-optic and thermo optical effects. (3) a frequency doubling OEO. based on light carrier Brillouin processing is designed to produce a suppression carrier bilateral band (DSB-SC) signal with Po1M. The photoelectric conversion of the DSB-SC signal is implemented, and the two frequency doubling microwave is produced. Signal. In order to maintain the stable oscillation of the OEO, the Brillouin gain is used to amplify the suppressed carrier and complete the transformation of the DSB-SC signal to the bilateral band (DSB) signal, thus producing the basic frequency microwave signal. This scheme can make the OEO produce a higher frequency microwave signal on the premise of using low frequency electronic devices. (4) a large signal electro-optical system is proposed. The chirped microwave pulse signal generation scheme under modulation is used to construct the pulse intensity time domain switch using the intensity modulator. The different phase modulation intervals of two optical phase modulation signals are selected in the time domain, and the optical signal in the selected phase modulation interval is beat. The chirped microwave pulse signal is realized. The chirped chirp is generated. The parameters of the central frequency, the chirp rate and the pulse repetition frequency of the chirped microwave pulse are directly determined by the amplitude, frequency and initial phase of the modulator's external microwave signal. Therefore, this method can realize the fine control of the parameters of the chirped microwave pulse signal. (5) a simple tuning triangle of the pulse repetition frequency is proposed. Under the modulation of large signal, we use the intensity modulator (IM) and the band pass filter (OBPF) working at the minimum transmission point to produce the positive odd order side band signals. Using the optical carrier Brillouin processing technology, the amplitude and phase of the suppressed optical carrier are controlled and the triangular microwave pulse is realized by the beat frequency. The impact of Brillouin gain, Brillouin nonlinear phase shift and carrier suppression ratio is analyzed. The effectiveness and simple tuning of the proposed scheme are proved by experiments. In summary, this paper focuses on the production technology of broadband microwave photon signals. Based on the new structure of OEO and external modulation technology, it is implemented respectively. The photonics of high-frequency / broadband single frequency, chirped and triangular microwave signals have important applications in the fields of communication system, pulse radar, electronic measurement and so on. In addition, the stability and practicability of the system based on the photon integration technology need to be further discussed and studied.

【學位授予單位】：西南交通大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：TN015;TN761

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