發(fā)布時(shí)間：2018-08-14 15:41

【摘要】：光電振蕩器(Optoelectronics Oscillator,OEO)作為一種新型的微波信號(hào)源,可以產(chǎn)生頻率高達(dá)幾百GHz、超高頻譜純度的射頻信號(hào)和微波光子信號(hào)。而低相位噪聲、高頻譜純度、高品質(zhì)因數(shù)的微波信號(hào)又被廣泛的應(yīng)用于宇宙探測(cè)、軍事雷達(dá)、航空航天、通訊系統(tǒng)和電子對(duì)抗等領(lǐng)域。隨著射頻通信的快速發(fā)展,近年來對(duì)于OEO的研究從降低相位噪聲轉(zhuǎn)移到實(shí)現(xiàn)可調(diào)諧輸出以及小型化和實(shí)用化過程中。論文首先介紹了光電振蕩器的基本概念,探討了OEO的基本工作原理和應(yīng)用領(lǐng)域。之后針對(duì)OEO系統(tǒng)中長光纖存在占用系統(tǒng)體積過大,容易受外界環(huán)境溫度和應(yīng)力影響等問題,結(jié)合光學(xué)諧振腔的光學(xué)性質(zhì),提出了利用光學(xué)諧振腔替換長光纖作為OEO系統(tǒng)延時(shí)器件的方案。論文重點(diǎn)開展了不同長度光纖在OEO系統(tǒng)延時(shí)效應(yīng)的研究,用實(shí)驗(yàn)數(shù)據(jù)分析了不同延時(shí)效應(yīng)對(duì)微波信號(hào)指標(biāo)的影響。為了提高光子在光學(xué)諧振腔中的延時(shí)效果,實(shí)驗(yàn)中設(shè)計(jì)了鎖頻調(diào)制系統(tǒng),使光子始終處于光學(xué)諧振腔的諧振點(diǎn)上。實(shí)驗(yàn)測(cè)試結(jié)果表明:使用品質(zhì)因數(shù)(Q值)為107光學(xué)諧振腔最多可以替換388米的長光纖。對(duì)于未來光電振蕩器體積的小型化具有潛在的意義。在此基礎(chǔ)上,論文結(jié)合透射式光學(xué)諧振腔的光學(xué)特性,進(jìn)一步研究了基于光學(xué)諧振腔的可調(diào)諧光電振蕩器實(shí)驗(yàn)方案。提出了利用相位調(diào)制器串聯(lián)透射式光學(xué)諧振腔的方案,利用光子濾波替換電濾波,以取代傳統(tǒng)系統(tǒng)中的強(qiáng)度調(diào)制器和濾波器,實(shí)現(xiàn)了系統(tǒng)結(jié)構(gòu)的優(yōu)化。測(cè)試結(jié)果表明:優(yōu)化后的系統(tǒng)可以輸出10GHz單模式微波信號(hào),還可以實(shí)現(xiàn)步長為23MHz的可調(diào)諧,實(shí)驗(yàn)結(jié)果驗(yàn)證了所提方案的正確性。論文最后分析了光電振蕩器的系統(tǒng)噪聲,并針對(duì)本文所提的基于光學(xué)諧振腔的光電振蕩器系統(tǒng),設(shè)計(jì)了溫控和鎖頻兩種優(yōu)化系統(tǒng)相位噪聲的方案。對(duì)比了兩種優(yōu)化方案的去相位噪聲效果,實(shí)驗(yàn)結(jié)果顯示:加入鎖頻系統(tǒng)后的OEO,在中心頻率10GHz附近微波信號(hào)的相位噪聲為-109.26dBc/Hz@10kHz。通過在OEO系統(tǒng)中引入光波導(dǎo)諧振腔,可以使整個(gè)OEO系統(tǒng)尺寸縮小到:21×9.5×7 cm3,為光電振蕩器的小型化和實(shí)用化發(fā)展提供了一種新的思路。
[Abstract]:As a new type of microwave signal source, Optoelectronics oscillator can produce RF signal and microwave photon signal with frequency up to several hundred GHz and ultra-high spectral purity. However, microwave signals with low phase noise, high spectral purity and high quality factor are widely used in space exploration, military radar, aerospace, communication systems and electronic countermeasures. With the rapid development of RF communication, the research on OEO has shifted from phase noise reduction to tunable output, miniaturization and practicality in recent years. In this paper, the basic concept of optoelectronic oscillator is introduced, and the basic working principle and application field of OEO are discussed. In view of the problem that the long optical fiber in OEO system occupies too much volume and is easily affected by the external environment temperature and stress, the optical properties of the optical resonator are combined. A scheme of replacing long fiber optic fiber with optical resonator as delay device in OEO system is proposed. In this paper, the delay effect of fiber with different lengths in OEO system is studied, and the influence of different delay effect on microwave signal index is analyzed with experimental data. In order to improve the delay effect of photons in the optical resonator, a frequency locking modulation system is designed in the experiment, which makes the photon always at the resonance point of the optical resonator. The experimental results show that the use of a quality factor (Q) of 107 optical resonators can replace up to 388 meters of long optical fiber. It has potential significance for the miniaturization of optoelectronic oscillator volume in the future. On this basis, combining the optical characteristics of the transmission optical resonator, the experimental scheme of the tunable optoelectronic oscillator based on the optical resonator is further studied. A series transmission optical resonator with phase modulator is proposed. The photon filter is used to replace the electric filter to replace the intensity modulator and filter in the traditional system. The structure of the system is optimized. The test results show that the optimized system can output 10GHz single-mode microwave signal and realize the tunable step size of 23MHz. The experimental results verify the correctness of the proposed scheme. Finally, the system noise of the optoelectronic oscillator is analyzed, and two schemes of temperature control and frequency locking are designed for the optoelectronic oscillator system based on the optical resonator proposed in this paper. The experimental results show that the phase noise of microwave signal near the center frequency 10GHz is -109.26 dBcr / Hz @ 10kHz. By introducing the optical waveguide resonator into the OEO system, the size of the whole OEO system can be reduced to 21 脳 9.5 脳 7 cm ~ 3, which provides a new way of thinking for the miniaturization and practical development of the optoelectronic oscillator.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN752

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