發(fā)布時間：2018-02-25 16:01

  本文關(guān)鍵詞： 微波光子技術(shù) 光電振蕩器 多頻率光電振蕩器 反饋調(diào)制　出處：《貴州大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：目前,微波信號廣泛運用于生產(chǎn)生活中的各個領(lǐng)域,其中航空、航天、軍事雷達(dá)等領(lǐng)域都需要高質(zhì)量的微波信號,使得微波信號源成為微波系統(tǒng)中的核心部件,它是整個微波系統(tǒng)性能好壞的決定因素之一。但傳統(tǒng)微波源不能很好的平衡高質(zhì)量與高頻率之間的問題,因此吸引了大量國內(nèi)外研究者研究新型微波源。近年來,由于光電器件性能與制作工藝的蓬勃發(fā)展,產(chǎn)生了多種光子微波信號產(chǎn)生技術(shù)。本文的主要內(nèi)容就是通過對現(xiàn)有的光電振蕩器(Optoelectronic Oscillator,OEO)進(jìn)行優(yōu)化、改進(jìn)、拓展以獲得高頻率、低相位噪聲的微波信號。本文中我們介紹了OEO的發(fā)展現(xiàn)狀、結(jié)構(gòu),并對其進(jìn)行了詳細(xì)的理論分析。針對光電振蕩器目前存在的問題——高Q值與邊模抑制之間的矛盾,本文提出了一種光場往返調(diào)制的光域雙環(huán)路光電振蕩器。系統(tǒng)中光信號往返兩次通過馬赫-曾德爾調(diào)制器后再進(jìn)行反饋調(diào)制,使得環(huán)路中的光纖延時利用率得到加倍,同時構(gòu)成兩個不同環(huán)長的光學(xué)環(huán)路,進(jìn)行邊模抑制。通過實驗,獲得了邊模抑制比為48.33dB,在頻偏10kHz時的單邊帶相位噪聲為-97.35dBc/Hz的微波信號。該結(jié)構(gòu)無需增加有源器件,降低了系統(tǒng)中光纖的使用量,簡化了實驗的控制參數(shù)。信號在兩個環(huán)路中循環(huán)時相向傳輸,進(jìn)而消除了隨機(jī)干涉和拍噪聲引入。此外,為了提高成本效益,我們還提出了一種多頻率光電振蕩器。通過在光域雙環(huán)路光電振蕩器結(jié)構(gòu)中簡單增加平行濾波支路就能建立多個獨立振蕩,實現(xiàn)多頻率輸出。實驗驗證了頻率為20GHz和9GHz的雙頻光電振蕩器,測得信號的邊模抑制比超過65dB。在頻偏10kHz時,20GHz和9GHz信號的單邊帶相位噪聲分別為-108dBc/Hz和-113dBc/Hz。該結(jié)構(gòu)不會引入其他的噪聲且兩個信號之間不會出現(xiàn)相互干擾現(xiàn)象�；贠EO的微波信號發(fā)生器結(jié)構(gòu)簡單,性能良好,其應(yīng)用范圍十分廣闊。
[Abstract]:At present, microwave signal is widely used in various fields of production and life. Among them, high quality microwave signal is needed in aviation, aerospace, military radar and so on, which makes microwave signal source become the core component of microwave system. It is one of the determinants of the performance of the whole microwave system, but the traditional microwave source can not balance the problem between high quality and high frequency, so it attracts a lot of researchers at home and abroad to study the new microwave source. Due to the rapid development of optoelectronic device performance and fabrication technology, a variety of photonic microwave signal generation techniques have been produced. The main content of this paper is to optimize and improve the existing optoelectronic Oscillator OOEO to obtain high frequency. Microwave signal with low phase noise. In this paper, we introduce the development and structure of OEO, and make a detailed theoretical analysis of it. In view of the existing problem of optoelectronic oscillator, the contradiction between high Q value and side mode suppression, In this paper, a kind of optical domain double loop optoelectronic oscillator is proposed, in which the optical signal is modulated by the Mach Zehnder modulator twice, and the time delay efficiency of the optical fiber in the loop is doubled. At the same time, two optical loops with different ring lengths are constructed for edge-mode suppression. The edge-mode rejection ratio is 48.33 dB and the single-sideband phase noise is -97.35 dBc / Hz when the frequency offset is 10 kHz. There is no need to add active devices to the structure. It reduces the amount of optical fiber used in the system and simplifies the control parameters of the experiment. The signal is transmitted in opposite direction as it circulates in two loops, thereby eliminating the introduction of random interference and beat noise. In addition, in order to improve the cost efficiency, We also propose a multi-frequency optoelectronic oscillator, in which multiple independent oscillations can be established by simply adding parallel filter branches to the optical-domain double-loop optoelectronic oscillator. The multi-frequency output is realized. The double-frequency optoelectronic oscillator with 20GHz and 9GHz frequencies is verified by experiments. The edge-mode rejection ratio of the measured signal is more than 65 dB. The single sideband phase noise of 20GHz and 9GHz signals at 10kHz is -108 dBcr / Hz and -113dBc / Hz. this structure will not introduce any other noise and there will be no interference between the two signals. The structure of microwave signal generator is simple, Its performance is good, its application scope is very broad.
【學(xué)位授予單位】：貴州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN753.2

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本文編號：1534216