本文選題：ROF　切入點(diǎn)：光載毫米波　出處：《吉林大學(xué)》2015年碩士論文

【摘要】：ROF(Radio over Fiber)技術(shù)融合了“光纖通信”與“無線通信”兩者的優(yōu)勢(shì),為目前用戶大容量、高帶寬及移動(dòng)性等需求提供了理想的解決方案,由于光毫米波生成與傳輸技術(shù)是ROF技術(shù)中的關(guān)鍵,所以本文研究內(nèi)容核心是光載毫米波信號(hào)的產(chǎn)生方式與鏈路性能分析,主要研究內(nèi)容概括為以下幾點(diǎn):第一,本文對(duì)ROF毫米波產(chǎn)生方式的國內(nèi)外研究現(xiàn)狀做了一個(gè)總結(jié),理論分析了幾種主流的毫米波產(chǎn)生原理,如:直接調(diào)制技術(shù)、光學(xué)外差技術(shù)、相位調(diào)制技術(shù)、利用非線性效應(yīng)產(chǎn)生毫米波技術(shù)及外部調(diào)制技術(shù)等,并針對(duì)這幾種方案的優(yōu)點(diǎn)與不足分別進(jìn)行了討論,進(jìn)而提出了基于馬赫增德爾調(diào)制器(MZM)外部調(diào)制技術(shù)產(chǎn)生毫米波的優(yōu)勢(shì)。第二,基于MZM的外部調(diào)制技術(shù)產(chǎn)生毫米波的幾種常見形式,如:雙邊帶(DSB)、載波抑制雙邊帶(OCS)、單邊帶(SSB)做了理論研究,并通過Optisystem7.0軟件,對(duì)以上三種毫米波產(chǎn)生方式分別進(jìn)行了仿真模擬。第三,本文對(duì)傳統(tǒng)外部調(diào)制技術(shù)中兩種典型的色散效應(yīng):“周期性衰落效應(yīng)”及“碼元縮窄效應(yīng)”做了詳細(xì)的理論推導(dǎo)及仿真分析。首先通過Optisystem7.0軟件,建立了常見的雙邊帶(DSB)、單邊帶(SSB)及載波抑制雙邊帶(OCS)等三種光載毫米波產(chǎn)生系統(tǒng)模型,然后對(duì)這三種系統(tǒng)所存在的色散現(xiàn)象及系統(tǒng)性能進(jìn)行了詳細(xì)的理論研究及仿真分析。通過Optisystem仿真,我們得到了DSB、SSB和OCS光毫米波在經(jīng)過不同距離下的光纖傳輸后的模擬眼圖,結(jié)果發(fā)現(xiàn),隨著傳輸距離增加,眼圖質(zhì)量逐漸變差,“眼睛”趨于閉合,說明光纖色散限制了光毫米波信號(hào)的傳輸距離。第四,為了抑制傳統(tǒng)外部調(diào)制法中“周期性衰落效應(yīng)”及“碼元縮窄效應(yīng)”所帶來的色散效應(yīng),本文提出了一種新型的單邊帶調(diào)制方案。本文從理論分析結(jié)合仿真模擬驗(yàn)證了該技術(shù)不僅可以有效抑制光纖色散對(duì)ROF系統(tǒng)傳輸性能的影響,并且提高了信號(hào)傳輸距離。具體實(shí)現(xiàn)過程:首先從理論上推導(dǎo)了該方案克服“碼元縮窄效應(yīng)”的實(shí)現(xiàn)過程;然后通過Optisystem仿真,得到了光毫米波在經(jīng)過不同光纖傳輸距離后的模擬眼圖,結(jié)果發(fā)現(xiàn),在新型的調(diào)制方案中,當(dāng)傳輸距在90km時(shí),眼圖質(zhì)量仍然很好,當(dāng)傳輸距離在100km時(shí),眼圖質(zhì)量已經(jīng)開始下降。相比傳輸系統(tǒng)來看,本文提出的新型單邊帶調(diào)制方案能很好地抑制“周期性衰落問題”和“碼間干擾問題”。在長距離傳輸質(zhì)量方面,具有很明顯的性能改進(jìn)。
[Abstract]:ROF(Radio over Fibertechnology combines the advantages of "optical fiber communication" and "wireless communication" to provide an ideal solution to the current needs of large capacity, high bandwidth and mobility.Because optical millimeter wave generation and transmission technology is the key of ROF technology, the core of this paper is the generation mode and link performance analysis of optical millimeter wave signal. The main research contents are summarized as follows: first,In this paper, the domestic and international research status of ROF millimeter wave generation is summarized, and several mainstream millimeter wave generation principles are theoretically analyzed, such as direct modulation, optical heterodyne, phase modulation, and so on.The advantages and disadvantages of these schemes are discussed, and the advantages of the external modulation technology based on MZM are proposed.Secondly, several common forms of millimeter-wave generation based on external modulation technology of MZM, such as two-sided band-band MZM, carrier suppressed-two-sideband (MZM), single sideband (SSB), are studied theoretically, and Optisystem7.0 software is used.The above three millimeter wave generation methods are simulated separately.Thirdly, in this paper, two typical dispersion effects in traditional external modulation techniques, namely "periodic fading effect" and "symbol narrowing effect", are derived and simulated in detail.Firstly, three kinds of optical millimeter-wave generation models are established by using Optisystem7.0 software, such as two-sided band Optisystem7.0, single sideband sideband (SSBs) and carrier suppression two-sided band band (Optisystem7.0).Then the dispersion phenomenon and system performance of these three systems are studied and simulated in detail.Through the Optisystem simulation, we get the simulated eye diagram of the optical millimeter wave of DSB-SSB and OCS at different distances. The results show that the quality of the eye image becomes worse with the increase of the transmission distance, and the "eye" tends to close.The dispersion limits the transmission distance of millimeter wave signal.Fourthly, in order to suppress the dispersion effect caused by "periodic fading effect" and "symbol narrowing effect" in traditional external modulation, a new single-sideband modulation scheme is proposed in this paper.The theoretical analysis and simulation results show that the proposed technique can not only effectively suppress the influence of fiber dispersion on the transmission performance of ROF systems, but also improve the signal transmission distance.The realization process: firstly, the realization process of the scheme to overcome the symbol narrowing effect is deduced theoretically, and then through Optisystem simulation, the simulated eye diagram of the optical millimeter wave passing through different optical fiber transmission distance is obtained, and the result shows that,In the new modulation scheme, when the transmission distance is at 90km, the quality of the ophthalmogram is still very good, and when the transmission distance is at 100km, the quality of the ophthalmogram has begun to decline.Compared with the transmission system, the new SSB modulation scheme proposed in this paper can suppress "periodic fading problem" and "inter-symbol interference problem" well.In the long distance transmission quality, there are obvious performance improvements.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN929.1

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