本文選題：光電振蕩器　切入點：頻率傳輸　出處：《北京郵電大學》2015年博士論文

【摘要】：高精度航天測控和雷達探測應(yīng)用的發(fā)展既對高頻、高性能頻率源提出了新的需求,又面臨寬帶頻率信號高穩(wěn)定傳遞和時間信號高精度同步的挑戰(zhàn)。研究高穩(wěn)定光電振蕩器(OEO)的頻率漂移補償技術(shù)和基于光纖的高精度時間、頻率傳遞理論與技術(shù),具有重要的科學價值和應(yīng)用前景。為滿足高頻、高性能頻率源的需求,論文提出了一種面向高穩(wěn)定可調(diào)諧OEO的頻率漂移補償技術(shù),首次實現(xiàn)了寬帶連續(xù)可調(diào)諧OEO的主動頻率漂移補償。通過注入一個低頻外部參考信號提取OEO環(huán)路時延抖動信息,并反饋控制OEO光源的波長,對時延抖動進行補償,實現(xiàn)OEO的穩(wěn)定。該技術(shù)具有補償范圍大的特點,且與OEO的工作頻率無關(guān),能夠穩(wěn)定寬帶可調(diào)諧OEO。實驗中,輸出穩(wěn)定信號的范圍為2.4GHz到10GHz。OEO工作在2.4GHz振蕩頻率時,1000s穩(wěn)定度在補償后達到了5×10-9,比不補償時改善超過兩個數(shù)量級,補償前后,在偏離載波10kHz處的相位噪聲都低于-120dBc/Hz。同時保證了OEO的短期穩(wěn)定性和長期穩(wěn)定性。為解決傳統(tǒng)窄帶頻率傳輸方案中時延補償范圍不足和覆蓋范圍不足的缺點,提出了兩種解決方案,包括a)大動態(tài)補償范圍的穩(wěn)定頻率傳輸技術(shù),使用相位共軛補償方法,不需要傳統(tǒng)可調(diào)器件,突破了傳統(tǒng)補償方式的補償范圍限制,實現(xiàn)了2.8GHz頻率信號從遠端天線至中心處理站10km光纖鏈路的超大補償范圍的穩(wěn)定傳輸；b)多點傳輸?shù)姆�(wěn)定頻率傳輸技術(shù),實現(xiàn)了“點到多點”的從中心處理站到各遠端天線的穩(wěn)定頻率傳輸,在30km光纖鏈路上任一點恢復出的信號相位抖動小于2ps,極大的擴展了光纖頻率傳輸?shù)母采w范圍,有效地降低系統(tǒng)的復雜性和成本。為了解決未來分布式天線陣列對系統(tǒng)提出的寬帶信號傳輸和時頻同步問題,提出了兩種解決方案,包括a)寬帶的穩(wěn)定頻率傳輸技術(shù),利用光纖對不同波長光載波具有不同色散的原理,通過中心處理站傳輸一個校準射頻信號以補償光纖鏈路的相位抖動,在一套傳輸系統(tǒng)中實現(xiàn)了1.205GHz和2.46GHz的多個頻率信號從遠端天線至中心處理站10km光纖鏈路的穩(wěn)定傳輸,極大的簡化了天線的功能；b)時間頻率同時傳輸技術(shù),為克服時間信號高精度同步的挑戰(zhàn),論文提出了時間信號和頻率信號采用同一光載波傳輸?shù)姆桨?首次實現(xiàn)了時間同步和頻率標準傳遞的協(xié)同控制,充分利用頻率傳輸時延抖動小的優(yōu)勢,提高時鐘同步的精度,實現(xiàn)高穩(wěn)定時間頻率信號的同時傳輸。將時間信號調(diào)制到2GHz頻率信號上與1.21GHz頻率參考信號同時傳輸,在50km的光纖鏈路中時間信號傳輸?shù)臅r間偏差在1s平均時達到了40ps,在1000s平均時減小至2.3ps。頻率參考信號的1s穩(wěn)定度達到了2.8×10-13,1000s的穩(wěn)定度達到了2×10-15。同時實現(xiàn)了時間和頻率信號的光纖穩(wěn)定傳輸。
[Abstract]:The development of high precision space TT & C and radar detection applications has put forward new requirements for high frequency and high performance frequency sources. It also faces the challenge of high stable transmission of wideband frequency signal and high precision synchronization of time signal. This paper studies the frequency drift compensation technology of high stability optoelectronic oscillator (OEO) and the theory and technology of high precision time and frequency transfer based on optical fiber. In order to meet the needs of high frequency and high performance frequency sources, a frequency drift compensation technique for high stable tunable OEO is proposed. The active frequency drift compensation of broadband continuously tunable OEO is realized for the first time. The delay jitter information of OEO loop is extracted by injecting a low frequency external reference signal, and the wavelength of OEO light source is controlled by feedback to compensate the delay jitter. This technique has the characteristics of wide compensation range, independent of the working frequency of OEO, and can stabilize the broadband tunable OEO. The output stability signal ranges from 2.4GHz to 10GHz.OEO at the 2.4GHz oscillation frequency, and the stability of 1000s reaches 5 脳 10 ~ (-9) after compensation, which is more than two orders of magnitude better than that without compensation, before and after compensation. The phase noise at deviation from carrier 10kHz is lower than -120dBc / Hz. at the same time, the short and long term stability of OEO is guaranteed. In order to solve the shortcomings of delay compensation range and coverage in traditional narrowband frequency transmission scheme, Two solutions are proposed, including the stable frequency transmission technology with a large dynamic compensation range. The phase conjugation compensation method is used without the need of traditional tunable devices, which breaks through the limitation of the compensation range of the traditional compensation method. The stable frequency transmission technology of 2.8GHz frequency signal from remote antenna to 10km fiber link of central processing station is realized. The stable frequency transmission from the central processing station to the remote antenna is realized. The signal phase jitter recovered at any point in the 30km fiber link is less than 2 pss. which greatly expands the coverage of the fiber frequency transmission. In order to solve the problem of wideband signal transmission and time-frequency synchronization proposed by distributed antenna array in the future, two solutions are proposed, including a) broadband stable frequency transmission technology. Based on the principle that the fiber has different dispersion to different wavelength optical carriers, a calibrated RF signal is transmitted through the central processing station to compensate for the phase jitter in the fiber link. In a transmission system, the stable transmission of multiple frequency signals of 1.205GHz and 2.46GHz from the remote antenna to the central processing station 10km fiber link is realized, which greatly simplifies the technology of simultaneous time and frequency transmission of the antenna. In order to overcome the challenge of high precision time signal synchronization, a scheme of time signal and frequency signal transmission using the same optical carrier is proposed in this paper, and the cooperative control of time synchronization and frequency standard transmission is realized for the first time. In order to improve the precision of clock synchronization and realize the simultaneous transmission of high stable time-frequency signal, the time signal is modulated to the 2GHz frequency signal and transmitted simultaneously with the 1.21GHz frequency reference signal. In the optical fiber link of 50km, the time deviation of time signal transmission reaches 40 psat 1s average, and decreases to 2.3psat 1000s average. The 1s stability of frequency reference signal reaches 2.8 脳 10-131000s and 2 脳 10-15s. The time and frequency are realized at the same time. The signal is transmitted steadily by optical fiber.
【學位授予單位】：北京郵電大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：TN753.2

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相關(guān)期刊論文 前1條

1 徐偉;金韜;池灝;;耦合式光電振蕩器的理論與實驗研究[J];激光技術(shù);2014年05期

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本文編號：1690491