基于电光外调制的宽带微波光子信号生成技术研究

发布时间：2018-04-23 16:09

本文选题：微波光子学 + 微波信号产生　；参考：《西南交通大学》2016年博士论文

【摘要】：随着现代信息技术的发展,低频段的微波频带资源已难以满足人们生产生活的需求,高速增长的无线数据流量对微波载频提出了更高的要求。但是,基于传统电子学的方法产生、传输和处理高频微波信号,面临着电子瓶颈等问题。在此背景下,研究光与微波相互作用的微波光子学,吸引了众多学术界和工业界人士的关注。由于光子学技术具有大带宽、低传输损耗、抗电磁干扰等优点,利用光子学手段来产生、传输和处理高频段微波信号,无疑是解决高频段微波使用所面临问题的一种理想方案。本文将围绕微波光子学中的一个主要研究方向——微波信号的光子学产生,以基于电光外调制的宽带微波光子信号生成技术研究为选题,旨在探索新的低相位噪声单频微波信号和任意波形微波信号的产生方法,提高微波光子信号产生系统的性能。本文分别研究了基于光电振荡器(OEO)的低相位噪声单频微波信号产生技术和基于外调制的任意波形微波信号产生技术。首先,在基于OEO的单频微波信号产生方面,详细研究了OEO的幅值特性与调制系数可调谐性,在此基础上,提出了一种基于OEO的高速光脉冲产生方案；同时,探讨了OEO的频率调谐、边模抑制和高频输出等问题的解决方法,设计了两种新型的OEO方案。其次,在基于外调制的任意波形微波信号产生方面,详细研究了任意波形微波信号的精细生成与快速调谐的实现方法,分别提出了一种大信号电光调制下的啁啾微波脉冲产生方案和一种基于非线性调制的三角形微波信号产生方案。本文的主要研究内容和成果如下：(1)推导了可用于描述OEO振荡过程的迭代方程组。通过数值仿真,详细研究了OEO从起振开始,振荡幅值和环路增益所经历的变化过程；分析了OEO能够维持稳定振荡的开环增益条件；得到了由OEO直接产生的微波信号的最大幅值。在上述分析基础上,估算了OEO中调制器的调制系数的可调谐范围；同时,探讨了工作在特定调制系数下的OEO在信号产生中的新应用,设计了一种基于OEO的高速光脉冲信号产生方案,并通过实验产生了归零码(RZ)和抑制载波归零码(CS-RZ)光脉冲信号。(2)设计了一种基于级联光纤循环延时线(RDL)结构的多环OEO。分析了级联RDL结构的系统响应。应用级联RDL结构作为OEO的储能器件,同时执行OEO的模式选择功能,可以产生频率等于两个RDL的自由频谱范围(FSR)最小公倍数的微波信号。这样一个多环OEO方案,不仅可以有效增大振荡模式间隔,提高OEO的边模抑制效果,还可以通过电光、热光效应实现灵活的调谐。(3)设计了一种基于光载波布里渊处理的倍频OEO。在小信号调制下,利用Po1M来产生抑制载波双边带(DSB-SC)信号。对DSB-SC信号实施光电转换,产生了二倍频微波信号。为了维持OEO的稳定振荡,利用布里渊增益放大被抑制的载波,完成DSB-SC信号到双边带(DSB)信号的转变,从而产生基频微波信号。这一方案可以使OEO在采用低频电子器件的前提下,产生更高频率的微波信号。(4)提出了一种大信号电光调制下的啁啾微波脉冲信号产生方案。利用强度调制器构建脉冲型强度时域开关,在时域上选取两个光相位调制信号的不同相位调制区间,并对选出的相位调制区间内的光信号进行拍频,实现了啁啾微波脉冲信号的产生。由于生成的啁啾微波脉冲的中心频率、啁啾率和脉冲重复频率等参数,直接决定于调制器外加微波信号的幅度、频率和初始相位。因此,这一方法可以实现对生成的啁啾微波脉冲信号的参数的精细调控。(5)提出了一种脉冲重复频率可简易调谐的三角形微波脉冲信号产生方案。在大信号调制下,利用工作于最小传输点的强度调制器(IM)和光带通滤波器(OBPF)来产生正奇次阶边带信号。应用光载波布里渊处理技术,控制被抑制的光载波的幅值和相位,最终通过拍频实现了三角形微波脉冲信号的产生。分析了布里渊增益、布里渊非线性相移和载波抑制比对波形的影响,实验证明了上述方案的有效性和简易的调谐性。综上所述,本论文重点研究了宽带微波光子信号的产生技术。基于新型结构的OEO和外调制技术,分别实现了高频/宽带的单频、啁啾和三角形微波信号的光子学产生,在通信系统、脉冲雷达、电子测量等领域具有重要应用。此外,基于光子集成技术提高系统的稳定性和实用性,还需要被进一步探讨和研究。
[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.

【学位授予单位】：西南交通大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TN015;TN761

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