發(fā)布時(shí)間：2018-07-30 07:01

【摘要】：微波／毫米波信號(hào)的產(chǎn)生及處理在電子對(duì)抗、雷達(dá)、無(wú)線(xiàn)通信等領(lǐng)域發(fā)揮著重要作用。傳統(tǒng)的電子學(xué)方法受限于器件帶寬,在產(chǎn)生及處理高頻、大帶寬信號(hào)時(shí),會(huì)遇到電子“瓶頸”,而利用光子學(xué)大帶寬、低損耗、抗電磁干擾等優(yōu)勢(shì),可以實(shí)現(xiàn)高頻率和大帶寬的微波信號(hào)產(chǎn)生及處理,因而研究微波光子信號(hào)產(chǎn)生及處理具有非常重要的戰(zhàn)略意義和應(yīng)用價(jià)值。在本論文中,研究了微波光子信號(hào)產(chǎn)生及處理的若干關(guān)鍵技術(shù),提出兩種利用相移光纖光柵的光電振蕩器方案,以產(chǎn)生相位噪聲低、頻率穩(wěn)定性高的單頻微波信號(hào)；給出基于頻率-時(shí)間映射產(chǎn)生寬帶啁啾微波信號(hào)方案,可實(shí)現(xiàn)較大的時(shí)間帶寬積,并給出系統(tǒng)數(shù)學(xué)模型和信號(hào)性能分析結(jié)果；給出基于頻率-時(shí)間映射產(chǎn)生相位編碼微波信號(hào)的數(shù)學(xué)模型及設(shè)計(jì)方法,并對(duì)信號(hào)的性能進(jìn)行了分析；此外,給出了處理高頻寬帶微波信號(hào)的光子時(shí)間拉伸系統(tǒng)理論模型,并對(duì)該系統(tǒng)的各項(xiàng)性能進(jìn)行了研究。本論文的主要?jiǎng)?chuàng)新點(diǎn)和學(xué)術(shù)貢獻(xiàn)如下：1.提出一種利用雙峰相移光纖光柵的光電振蕩器方案,并進(jìn)行實(shí)驗(yàn)驗(yàn)證。在該方案中,具有窄帶透射峰的高精度相移光纖光柵可以實(shí)現(xiàn)光電環(huán)路的高Q值,同時(shí),系統(tǒng)中雙透射峰的頻率間隔決定了微波信號(hào)的頻率大小。該結(jié)構(gòu)不需要使用長(zhǎng)光纖和窄帶微波濾波器,具有結(jié)構(gòu)緊湊、易集成、損耗低、成本低等優(yōu)點(diǎn)。該光電振蕩器方案在實(shí)驗(yàn)中實(shí)現(xiàn)了頻率為10.6 GHz的微波信號(hào),其相位噪聲在距載頻10 kHz處為-99.3 dBc/Hz。另外,針對(duì)光電振蕩器產(chǎn)生微波信號(hào)的頻率漂移問(wèn)題,提出一種自鎖定式光電振蕩器的理論改進(jìn)方案。該結(jié)構(gòu)中,主要利用梳狀光濾波器進(jìn)行穩(wěn)頻功能,相比附加反饋電路,此結(jié)構(gòu)簡(jiǎn)單易實(shí)現(xiàn)。2.提出一種基于頻率-時(shí)間映射產(chǎn)生啁啾微波信號(hào)的方案,可用于產(chǎn)生較大時(shí)間帶寬積的啁啾信號(hào)。根據(jù)該系統(tǒng)的數(shù)學(xué)模型,并進(jìn)一步研究了系統(tǒng)產(chǎn)生啁啾微波信號(hào)的最大時(shí)間帶寬積性能。仿真中得到了時(shí)間帶寬積為368的啁啾微波信號(hào),實(shí)驗(yàn)中得到了時(shí)間帶寬積為61.2的啁啾微波信號(hào)。3.給出了基于頻率-時(shí)間映射產(chǎn)生相位編碼信號(hào)的系統(tǒng)數(shù)學(xué)模型,并給出具體的系統(tǒng)設(shè)計(jì)方法,可用于獲得所需的相位編碼微波信號(hào)。另外,對(duì)該系統(tǒng)產(chǎn)生相位編碼信號(hào)的最大時(shí)間帶寬積性能進(jìn)行了研究。通過(guò)仿真和實(shí)驗(yàn)對(duì)理論結(jié)果進(jìn)行了有效地驗(yàn)證,仿真中得到了時(shí)間帶寬積為263.2相位編碼微波信號(hào)。該理論可以有效地指導(dǎo)實(shí)際系統(tǒng)的設(shè)計(jì)并獲取較好的信號(hào)性能。4.給出了嚴(yán)格的光子時(shí)間拉伸系統(tǒng)理論模型,精確地表征了系統(tǒng)輸出的各階諧波及互調(diào)分量。通過(guò)分別研究輸入單頻、雙頻信號(hào)情況,推導(dǎo)出系統(tǒng)輸出各階諧波、互調(diào)分量的嚴(yán)格表達(dá)式。基于此理論模型,可極大地簡(jiǎn)化光子時(shí)間拉伸系統(tǒng)的設(shè)計(jì),并可對(duì)系統(tǒng)各項(xiàng)參數(shù)進(jìn)行估算,如系統(tǒng)帶寬、諧波功率、時(shí)間帶寬積、1 dB壓縮點(diǎn)、三階截點(diǎn)、無(wú)雜散動(dòng)態(tài)范圍等。利用數(shù)值仿真和實(shí)驗(yàn)結(jié)果對(duì)此數(shù)學(xué)模型進(jìn)行了驗(yàn)證,仿真中,利用單臂調(diào)制器的光子時(shí)間拉伸系統(tǒng)無(wú)雜散動(dòng)態(tài)范圍為119.16 dB-Hz2/3,實(shí)驗(yàn)中的系統(tǒng)無(wú)雜散動(dòng)態(tài)范圍為88.9 dB-Hz2/3。
[Abstract]:The generation and processing of microwave / millimeter wave signal play an important role in electronic countermeasures, radar, wireless communication and other fields. The traditional electronic methods are limited to the bandwidth of the devices. When the high frequency and large bandwidth signals are produced and processed, the electronic "bottleneck" will be encountered, and the advantages of high bandwidth, low loss and electromagnetic interference can be realized by using photons. The generation and processing of microwave signals with high frequency and wide bandwidth are produced and processed. Therefore, it is very important to study the generation and processing of microwave photonic signals. In this paper, some key technologies for the generation and processing of microwave photonic signals are studied. Two kinds of optoelectronic oscillators using phase shifting fiber Bragg gratings are proposed. A single frequency microwave signal with low phase noise and high frequency stability is presented. A wideband chirped microwave signal based on frequency time mapping is presented, which can achieve a larger time bandwidth product, and give the mathematical model of the system and the result of signal performance analysis, and give a mathematical model and setting of a phase coded microwave signal based on frequency time mapping. In addition, the performance of the signal is analyzed. In addition, the theoretical model of the photonic time stretching system for processing high frequency broadband microwave signals is given and the performance of the system is studied. The main innovations and academic contributions of this paper are as follows: 1. a kind of optoelectronic oscillator with Shuangfeng phase shift fiber grating is proposed. In this scheme, the high precision phase shift fiber Bragg grating with the narrow band transmission peak can achieve high Q value of the photoelectric loop. At the same time, the frequency interval of the double transmission peak in the system determines the frequency of the microwave signal. The structure does not need long fiber and narrow band microwave filters, which has compact structure, easy integration and loss. The photoelectric oscillator realizes the microwave signal with a frequency of 10.6 GHz in the experiment, and its phase noise is -99.3 dBc/Hz. at 10 kHz from the carrier frequency. In view of the frequency drift of the microwave signal produced by the photoelectric oscillator, a theoretical improvement scheme for the self locking photoelectric oscillator is proposed. A comb like optical filter is used to stabilize frequency function. Compared with an additional feedback circuit, this structure is simple and easy to realize.2.. A chirped microwave signal based on frequency time mapping is proposed. It can be used to produce chirped signals with larger time bandwidth product. Based on the mathematical model of the system, the chirped micro system is further studied. The maximum time bandwidth product performance of the wave signal. The chirped microwave signal with the time bandwidth product of 368 is obtained in the simulation. In the experiment, the chirped microwave signal with the time bandwidth product of 61.2.3. gives the system mathematical model of the phase coded signal based on the frequency time mapping, and gives a specific system design method, which can be used to obtain the system. In addition, the maximum time bandwidth product performance of the phase coded signal produced by the system is studied. The theoretical results are effectively verified by simulation and experiment. The time bandwidth product of the 263.2 phase coded microwave signal is obtained in the simulation. The theory can effectively guide the establishment of the actual system. In order to obtain better signal performance.4., a strict theoretical model of photon time stretching system is given, which accurately characterizing the harmonic and intermodulation components of each order of the system output. By studying the input single frequency and double frequency signals, the strict expression of the system output harmonics and intermodulation is derived. Based on this theoretical model, it can be greatly improved. The design of the photon time stretching system is simplified, and the parameters of the system can be estimated, such as system bandwidth, harmonic power, time and bandwidth product, 1 dB compression point, three step point, no stray dynamic range and so on. The numerical simulation and experimental results are used to verify the mathematical model, and the photon time stretching of single arm modulator is used in simulation. The system has no spurious dynamic range of 119.16 dB-Hz2/3, and the system has no spurious dynamic range of 88.9 dB-Hz2/3..
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TN752;TN911.7

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