【摘要】：融合微波無(wú)線通信和光纖通信技術(shù)優(yōu)勢(shì)的微波光子學(xué),可以實(shí)現(xiàn)微波信號(hào)的光學(xué)生成、處理、控制和傳輸,在下一代寬帶無(wú)線通信和軍事通信領(lǐng)域具有重要的應(yīng)用前景。光學(xué)頻率梳生成是微波光子學(xué)的關(guān)鍵技術(shù)之一,如何產(chǎn)生載波數(shù)目多、譜線間隔大、帶外抑制比高、平坦度好以及穩(wěn)定性高的光學(xué)頻率梳是目前的研究熱點(diǎn)。本文重點(diǎn)關(guān)注基于電光調(diào)制器的光學(xué)頻率梳生成技術(shù),并將其應(yīng)用在WDM系統(tǒng)中。本文在分析電光調(diào)制器的理論基礎(chǔ)上,提出了兩種基于強(qiáng)度調(diào)制器IM的新型光學(xué)頻率梳生成方案。方案一基于兩個(gè)級(jí)聯(lián)的馬赫 曾德?tīng)枏?qiáng)度調(diào)制器,通過(guò)設(shè)置射頻信號(hào)幅值和直流偏置電壓,實(shí)現(xiàn)3、5、9、15和25線的可調(diào)光學(xué)頻率梳。方案二基于單個(gè)馬赫 曾德?tīng)枏?qiáng)度調(diào)制器調(diào)制雙音信號(hào)的結(jié)構(gòu),通過(guò)設(shè)置雙音信號(hào)的幅值、頻率和初始相位,并調(diào)節(jié)合適的直流偏置電壓,實(shí)現(xiàn)單個(gè)IM產(chǎn)生9線平坦光學(xué)頻率梳。分析和討論了調(diào)制指數(shù)、直流偏置電壓和初始相位等因素對(duì)這兩種方案的光學(xué)頻率梳平坦度的影響。鑒于光學(xué)頻率梳的帶寬受限于調(diào)制器的工作帶寬,研究并提出兩種擴(kuò)展光學(xué)頻率梳頻譜的方案。方案一利用馬赫 曾德?tīng)枏?qiáng)度調(diào)制器工作點(diǎn)不同,產(chǎn)生奇數(shù)階或偶數(shù)階光邊帶的原理,實(shí)現(xiàn)譜線間隔的擴(kuò)展,最終產(chǎn)生了15線和20線光學(xué)頻率梳。方案二設(shè)置雙平行馬赫 曾德?tīng)栒{(diào)制器DPMZM的射頻信號(hào)幅值和直流工作點(diǎn),利用光載波抵消的思想,實(shí)現(xiàn)50線寬帶光學(xué)頻率梳的生成。分析和討論了調(diào)制指數(shù)與所提方案光學(xué)頻率梳性能的關(guān)系。利用VPI仿真軟件和實(shí)際實(shí)驗(yàn)對(duì)上述方案進(jìn)行了驗(yàn)證。最后,基于單個(gè)DPMZM產(chǎn)生5線光學(xué)頻率梳作為光源,構(gòu)建點(diǎn)到點(diǎn)WDM通信系統(tǒng),利用VPI仿真實(shí)現(xiàn)單波10Gb/s數(shù)字信息經(jīng)30千米標(biāo)準(zhǔn)單模光纖傳輸后,系統(tǒng)誤碼率BER較小。
[Abstract]:Microwave photonics, which combines the advantages of microwave wireless communication and optical fiber communication, can realize the optical generation, processing, control and transmission of microwave signal. It has an important application prospect in the field of next generation broadband wireless communication and military communication. Optical frequency comb generation is one of the key techniques in microwave photonics. How to generate a large number of carriers, large spectral line spacing, high out-of-band suppression ratio, good flatness and high stability of optical frequency comb is a hot topic at present. This paper focuses on the optical frequency comb generation technology based on electro-optic modulator and its application in WDM system. Based on the analysis of the theory of electro-optic modulator, two novel optical frequency comb generation schemes based on intensity modulator (IM) are proposed in this paper. Scheme one is based on two cascaded Mach Zendel intensity modulators. By setting the amplitude of RF signal and DC bias voltage, the adjustable optical frequency comb with 3 / 5 / 9 / 15 and 25 lines is realized. The second scheme is based on the structure of a single Mach Zendel intensity modulator to modulate the dual-tone signal, by setting the amplitude, frequency and initial phase of the dual-tone signal, and adjusting the appropriate DC bias voltage. A single IM generates 9 line flat optical frequency comb. The effects of modulation index, DC bias voltage and initial phase on the optical frequency comb flatness of these two schemes are analyzed and discussed. Since the bandwidth of the optical frequency comb is limited by the bandwidth of the modulator, two schemes of spreading the spectrum of the optical frequency comb are studied and proposed. Scheme one uses the principle of generating odd or even order optical sideband to realize the spread of spectral line spacing, and finally produces 15 and 20 lines of optical frequency comb. In the second scheme, the amplitude of the RF signal and the DC operating point of the DPMZM are set, and the 50 line broadband optical frequency comb is generated by using the idea of optical carrier cancellation. The relationship between the modulation index and the optical frequency comb performance of the proposed scheme is analyzed and discussed. The above scheme is verified by VPI simulation software and practical experiments. Finally, a point-to-point WDM communication system is constructed based on a single DPMZM generation 5-wire optical frequency comb as a light source. The single-wave 10Gb/s digital information is transmitted through 30km standard single-mode optical fiber by VPI simulation. The BER of the system is small.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.11

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