本文關(guān)鍵詞：光電振蕩器的頻率穩(wěn)定化技術(shù)研究　出處：《浙江大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 光電振蕩器 頻率穩(wěn)定度 相位噪聲 鎖相環(huán) 自注入鎖定 注入鎖定 耦合型光電振蕩器

【摘要】：微波振蕩器是通信、測控、航天、雷達等諸多系統(tǒng)運行的源泉。得益于微波光子學(xué)的發(fā)展,光電振蕩器(optoelectronic oscillator,OEO)自1994年被提出,運用光載射頻(RoF)鏈路及微波反饋回路形成振蕩環(huán),可生成頻率最高達上百GHz的低相位噪聲微波信號,具有巨大的研究價值與廣闊的應(yīng)用前景。然而OEO中所使用的光纖的等效折射率與微波帶通濾波器的中心頻率對環(huán)境溫度變化與振動比較敏感,使其頻率穩(wěn)定性有待改善。本文主要對光電振蕩器的頻率穩(wěn)定化技術(shù)進行了研究。首先對OEO在相位噪聲、頻率穩(wěn)定度的研究現(xiàn)狀、常用技術(shù)進行了介紹,然后分析了OEO的理論模型,包括其閾值條件、振蕩功率和頻譜特性,研究了傳統(tǒng)Yao-Maleki模型未加考慮的閃爍噪聲、微波放大器的非線性對OEO系統(tǒng)的影響,對OEO的相位噪聲和振蕩功率表達式進行了修正和驗證。結(jié)合上述理論研究,本文針對X波段OEO提出了基于鎖相環(huán)(PLL)和雙自注入鎖定(DSIL)以提高OEO頻率穩(wěn)定度的方法。雙自注入鎖定方法降低了OEO的相位噪聲,減少了OEO的頻率漂移,并使每個自注入環(huán)引入的近載頻雜散模式相互抑制。然后設(shè)計了PLL電路,實現(xiàn)了DSILOEO與一個100 MHz的恒溫晶體振蕩器的相位鎖定。重點分析了PLL環(huán)路傳輸特性對PLL輸出信號的相位噪聲的影響,通過優(yōu)化PLL環(huán)路帶寬實現(xiàn)了 OEO近載頻相位噪聲的優(yōu)化,所得的9.95 GHz信號的相位噪聲為-55 dBc/Hz@ 10 Hz和-125dBc/Hz@10kHz,分別在100Hz和10kHz頻偏處實現(xiàn)了42 dB和21 dB的抑制,其頻率的阿倫方差在平均時間100s處達到7.03 × 10-12,提高了3個數(shù)量級。此外,本文在耦合型光電振蕩器(COEO)中采用注入鎖定-鎖相環(huán)(IL-PLL)提升了其頻率穩(wěn)定性。通過注入鎖定實現(xiàn)OEO振蕩頻率牽引、鎖頻以及邊模抑制,同時通過與參考源鎖相來穩(wěn)定COEO中的光電振蕩環(huán)路,使注入鎖定狀態(tài)易于保持。理論分析了IL-PLL對振蕩器的作用原理,然后通過實驗驗證了IL-PLL方法對COEO頻率穩(wěn)定性的提升,所得信號相位噪聲為-72dBc/Hz@10Hz,-103dBc/Hz@1kHz 及-121dBc/Hz@10kHz,頻率的阿倫方差在平均時間100 s處為6.41 × 10-12。
[Abstract]:Microwave oscillator is the source of communication, measurement and control, spaceflight, radar and so on, which benefit from the development of microwave photonics. Optoelectronic oscillator (OEO) has been proposed since 1994. The low phase noise microwave signal with a maximum frequency of hundreds of GHz can be generated by using the optical RF RF link and the microwave feedback loop to form an oscillatory loop. However, the equivalent refractive index of fiber used in OEO and the center frequency of microwave band-pass filter are sensitive to the change of ambient temperature and vibration. In this paper, the frequency stabilization technology of optoelectronic oscillator is studied. Firstly, the research status of phase noise and frequency stability of OEO is introduced. Then, the theoretical model of OEO is analyzed, including its threshold condition, oscillation power and spectrum characteristics, and the scintillation noise which is not considered in the traditional Yao-Maleki model is studied. The influence of nonlinear microwave amplifier on OEO system is studied. The phase noise and oscillatory power expressions of OEO are modified and verified. In this paper, based on phase-locked loop (PLL) and dual-self-injection locking (DS-L), a novel X-band OEO is proposed. In order to improve the frequency stability of OEO, the dual self-injection locking method reduces the phase noise of OEO. The frequency drift of OEO is reduced and the near-carrier spurious mode introduced by each self-injection loop is suppressed. Then the PLL circuit is designed. The phase locking between DSILOEO and a 100 MHz constant temperature crystal oscillator is realized. The effect of transmission characteristics of PLL loop on the phase noise of PLL output signal is analyzed. The OEO near-carrier frequency phase noise is optimized by optimizing the PLL loop bandwidth. The phase noise of the 9.95 GHz signal is -55 dBc/Hz@10 Hz and -125 dBc / Hz 10 kHz. 42 dB and 21 dB were suppressed at 100 Hz and 10 kHz frequency offset, respectively. The aron variance of the frequency reached 7.03 脳 10 ~ (-12) at the average time of 100 s. Increased by three orders of magnitude. In this paper, the frequency stability of the coupled optoelectronic oscillator (COEO) is enhanced by injection lock-phase locked loop (IL-PLL), and the OEO oscillation frequency traction is realized by injection locking. The frequency locking and edge mode suppression are used to stabilize the optoelectronic oscillation loop in COEO by combining with the reference source phase lock, which makes the injection locking state easy to maintain. The working principle of IL-PLL to the oscillator is analyzed theoretically. Then the IL-PLL method is proved to improve the frequency stability of COEO. The phase noise of the signal is -72 dBc / Hz @ 10Hz. 103dBc / HzR @ 1kHz and -121dBc / Hzr / Hz@ 10kHz, the Aron variance of the frequency is 6.41 脳 10-12 at an average time of 100s.
【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】：2017
【分類號】：TN752

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