【摘要】：高性能的頻率源在通訊、雷達、測量等領域有著重要的作用,是系統中射頻信號的來源。傳統的頻率源存在著頻率低、頻譜純度差等問題。光電振蕩器(Optoelectronic Oscillator,OEO)作為一種新型的頻率源,可以產生高頻率且Q值極高、相位噪聲極低的高性能射頻信號,并且可以產生抖動低的光脈沖信號,近年來受到了各國學者的關注。本論文對低相噪光電振蕩器的幾個關鍵技術進行了理論分析和實驗驗證。本文首先介紹了光電振蕩器的運轉機理,討論了低相噪光電振蕩器的三個關鍵技術:單模運轉、相位噪聲抑制和頻率穩(wěn)定性提升,闡述了這三種關鍵技術的常規(guī)解決方案和各自的基本原理,分析了它們的優(yōu)缺點。針對光電振蕩器各項指標的提升,提出了兩種方案,第一種方案是基于鎖相環(huán)的雙環(huán)光電振蕩器,分析了雙環(huán)的結構對邊模的抑制作用,通過鎖相環(huán)和溫控模塊提升了頻率穩(wěn)定性,理論推導了鎖相環(huán)光電振蕩器的噪聲傳遞函數,并優(yōu)化了光電振蕩器的噪聲。第二種是改進的注入鎖定式光電振蕩器,針對傳統的注入鎖定式光電振蕩器存在的失鎖問題,設計了額外的反饋環(huán)路,通過檢測注入鎖定式光電振蕩器和注入源的相位關系來控制環(huán)路長度,提高了光電振蕩器的長期穩(wěn)定性。另外,推導了注入鎖定式光電振蕩器s域的噪聲傳遞函數,并利用這一關系優(yōu)化了注入鎖定式光電振蕩器的相位噪聲。最后,基于鎖相環(huán)和注入鎖定技術,設計了光電振蕩器的工程化樣機。樣機可以長時間穩(wěn)定工作,輸出10GHz的高品質信號,邊模抑制比優(yōu)于75dB,在10kHz頻偏處相位噪聲低于-140dBc/Hz,且30小時內頻率漂移低于0.05ppm。
[Abstract]:High performance frequency source plays an important role in communication, radar, measurement and so on. It is the source of radio frequency signal in the system. The traditional frequency source has some problems such as low frequency and poor spectral purity. As a new type of frequency source, photoelectric oscillator (Optoelectronic Oscillator,OEO) can produce high performance RF signal with high frequency, extremely high Q value and very low phase noise, and can also produce low jitter optical pulse signal. In recent years, scholars from all over the world have paid close attention to it. In this paper, several key techniques of low phase noise photoelectric oscillator are theoretically analyzed and verified by experiments. This paper first introduces the operation mechanism of photoelectric oscillator, and discusses three key technologies of low phase noise photoelectric oscillator: single mode operation, phase noise suppression and frequency stability improvement. The general solutions and basic principles of these three key technologies are described, and their advantages and disadvantages are analyzed. In view of the improvement of each index of photoelectric oscillator, two schemes are proposed. The first scheme is a dual-loop photoelectric oscillator based on phase-locked loop, and the suppression effect of dual-loop structure on edge mode is analyzed. The frequency stability is improved by phase-locked loop and temperature control module. The noise transfer function of phase-locked loop photoelectric oscillator is deduced theoretically and the noise of photoelectric oscillator is optimized. The second one is an improved injection-locked photoelectric oscillator. An additional feedback loop is designed to solve the lock-out problem of the traditional injection-locked photoelectric oscillator. The loop length is controlled by detecting the phase relationship between the injection-locked photoelectric oscillator and the injection source, and the long-term stability of the photoelectric oscillator is improved. In addition, the noise transfer function in the s-domain of the injection-locked photoelectric oscillator is derived, and the phase noise of the injection-locked photoelectric oscillator is optimized by using this relation. Finally, based on phase-locked loop and injection locking technology, an engineering prototype of photoelectric oscillator is designed. The prototype can work stably for a long time and output the high quality signal of 10GHz. The edge mode rejection ratio is better than 75 dB, the phase noise at the 10kHz frequency offset is lower than-140 dB / H z, and the frequency drift is less than 0.05 ppm within 30 hours.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN752

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本文編號：2446835