本文關(guān)鍵詞： 光電振蕩器 布拉格光柵 法布里泊羅濾波器 相位噪聲 長期穩(wěn)定性 壓電陶瓷　出處：《浙江大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著現(xiàn)代光電技術(shù)的發(fā)展,光通信技術(shù)在航空航天、光纖通信、雷達(dá)探測等領(lǐng)域有著越來越重要的地位。光電技術(shù)的一個(gè)重要的核心器件信號源,也愈發(fā)的受到研究學(xué)者的重視。光電振蕩器(Optoelectronic Oscillator)作為一種高Q值、頻譜純度高、輸出信號穩(wěn)定且具有低相位噪聲的光電信號源,更是受到了研究者的青睞,得到了極大的發(fā)展。 本文先對光電振蕩器的經(jīng)典單環(huán)結(jié)構(gòu)進(jìn)行了介紹,并對光電振蕩器的工作原理進(jìn)行分析,對光電振蕩器的起振條件、輸出響應(yīng)線性化、噪聲特性等方面進(jìn)行了具體的分析。對現(xiàn)有的光電振蕩器結(jié)構(gòu)進(jìn)行了介紹,并對其工作原理,性能的優(yōu)缺點(diǎn)進(jìn)行了分析比較。 通過對光電振蕩器技術(shù)的研究與分析,本文提出了一種利用光纖布拉格光柵和法布里泊羅濾波器的新型光電振蕩器結(jié)構(gòu)。該結(jié)構(gòu)利用布拉格光柵和法布里泊羅濾波器構(gòu)成光環(huán)形腔產(chǎn)生穩(wěn)定的激光信號,減少了激光源的使用,避免了激光源帶入的相對強(qiáng)度噪聲。在該結(jié)構(gòu)中采用同一法布里泊羅濾波器進(jìn)行二次濾波,提高了整個(gè)系統(tǒng)的頻譜純度,同時(shí)減弱了溫度改變對于光電振蕩器輸出頻率的影響。實(shí)驗(yàn)結(jié)果測得,該結(jié)構(gòu)可以輸出8.97GHz的射頻信號,在偏移中心頻率10kHz處相位噪聲達(dá)到-109dBc/Hz。信號的輸出頻率邊模抑制比達(dá)到-50dB。并在實(shí)驗(yàn)室的條件下測得,整個(gè)系統(tǒng)運(yùn)行9個(gè)小時(shí),中心頻率的漂移僅有±2ppm,有著良好的長期穩(wěn)定性。 最后,對光電振蕩器的長期穩(wěn)定性進(jìn)行了比較詳細(xì)分析。重點(diǎn)分析了環(huán)境溫度改變對于光電振蕩器中光纖折射率、射頻濾波器的影響。對現(xiàn)有的對光電振蕩器長期穩(wěn)定性改進(jìn)方法進(jìn)行了分析,比較了它們之間的優(yōu)勢與不足之處,參照現(xiàn)有的壓電陶瓷調(diào)節(jié)方法,提出一種利用壓電陶瓷來改變光電振蕩器光纖長度,進(jìn)而提高光電振蕩器長期穩(wěn)定性的方法。
[Abstract]:With the development of modern optoelectronic technology, optical communication technology plays a more and more important role in the fields of aerospace, optical fiber communication, radar detection and so on. Optoelectronic Oscillator is a kind of optoelectronic signal source with high Q value, high spectral purity, stable output signal and low phase noise. In this paper, the classical single-ring structure of the optoelectronic oscillator is introduced, and the working principle of the optoelectronic oscillator is analyzed. The structure of the existing optoelectronic oscillator is introduced, the working principle, the advantages and disadvantages of its performance are analyzed and compared. Through the research and analysis of optoelectronic oscillator technology, In this paper, a novel optoelectronic oscillator structure using fiber Bragg grating and Fabry-Perot filter is proposed. The structure uses Bragg grating and Fabry-Perot filter to produce stable laser signal in an optical ring cavity. The use of laser source is reduced and the relative intensity noise brought in by laser source is avoided. In this structure, the same Fabry-Perot filter is used for secondary filtering, which improves the spectral purity of the whole system. At the same time, the influence of temperature change on the output frequency of the optoelectronic oscillator is reduced. The experimental results show that the structure can output 8.97GHz RF signal. At the offset center frequency of 10kHz, the phase noise reaches -109dBc / Hz. the output frequency side mode rejection ratio of the signal reaches -50dB.It has been measured under laboratory conditions that the whole system runs for 9 hours and the drift of the center frequency is only 鹵2 ppms. it has good long-term stability. Finally, the long-term stability of the optoelectronic oscillator is analyzed in detail. The influence of RF filter. The existing methods to improve the long-term stability of the optoelectronic oscillator are analyzed, and the advantages and disadvantages between them are compared. This paper presents a method to improve the long-term stability of an optoelectronic oscillator by using piezoelectric ceramics to change the length of the optical fiber.
【學(xué)位授予單位】：浙江大學(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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