本文選題：ROF系統(tǒng) + 多載波發(fā)生器　； 參考：《北京交通大學(xué)》2016年博士論文

【摘要】：微波光子學(xué)是將微波學(xué)和光子學(xué)相結(jié)合的一門(mén)新興學(xué)科。其研究范圍主要包括高頻微波發(fā)生器、光子信號(hào)處理技術(shù)、ROF接入系統(tǒng)等。其中,ROF技術(shù)結(jié)合了傳統(tǒng)的光纖通信和無(wú)線通信兩大技術(shù),可以實(shí)現(xiàn)高達(dá)Gbps量級(jí)的無(wú)線寬帶接入,為未來(lái)大容量網(wǎng)絡(luò)通信提供了契機(jī)。本文結(jié)合國(guó)家自然科學(xué)基金面上項(xiàng)目,針對(duì)多載波發(fā)生器、高頻毫米波光子發(fā)生器、多路信號(hào)全光頻率上變換、最佳單邊帶調(diào)制技術(shù)及全雙工WDM-ROF傳輸技術(shù),展開(kāi)了一系列較為深入的理論、仿真及實(shí)驗(yàn)研究。具體研究成果和內(nèi)容有以下幾方面:1.實(shí)驗(yàn)研究了 ROF系統(tǒng)應(yīng)用中的多載波發(fā)生器。采用FP激光器可以實(shí)現(xiàn)多條光載波信號(hào)的輸出,雖然有低成本優(yōu)勢(shì),但是其頻譜范圍和多載波平坦度不足,在此基礎(chǔ)上提出了光學(xué)調(diào)制器級(jí)聯(lián)產(chǎn)生的超平坦多載波發(fā)生器結(jié)構(gòu),可進(jìn)一步提高了多載波的頻譜范圍和平坦度,實(shí)驗(yàn)驗(yàn)證了該方案的可實(shí)施性。2.提出并研究了基于多載波發(fā)生器的高頻毫米波光子產(chǎn)生方案。利用多載波發(fā)生器的譜特性,通過(guò)選擇頻率間隔不同的兩條光載波信號(hào)進(jìn)行拍頻得到不同頻率的高頻毫米波信號(hào),進(jìn)一步提高可產(chǎn)生高頻毫米波的頻率范圍和傳輸鏈路的性能。分別實(shí)現(xiàn)了 440GHz和480GHz高頻毫米波信號(hào)的產(chǎn)生。3.提出并研究了 ROF系統(tǒng)中基于多載波發(fā)生器的多路信號(hào)同時(shí)全光上變頻方案。對(duì)現(xiàn)有轉(zhuǎn)換效率低下的全光上變換技術(shù)進(jìn)行改進(jìn),通過(guò)對(duì)多載波發(fā)生器的輸出光譜進(jìn)行再調(diào)制實(shí)現(xiàn)了 7路信號(hào)同時(shí)上變頻到60GHz的毫米波信號(hào),為進(jìn)一步提高全光上變頻轉(zhuǎn)換效率,又利用超平坦多載波發(fā)生器實(shí)現(xiàn)了 15路信號(hào)的同時(shí)全光上變頻。4.提出了基于多載波發(fā)生器的ROF雙向傳輸方案。首先提出了一種基于波長(zhǎng)重用技術(shù)的ROF雙向傳輸系統(tǒng)。將中心站的光載波在基站加以重新利用,為上行傳輸鏈路提供光源,下行鏈路60GHz毫米波產(chǎn)生的同時(shí)實(shí)現(xiàn)了上行數(shù)據(jù)的加載和傳輸。為進(jìn)一步提高頻譜利用率和系統(tǒng)性能,又提出了一種基于多載波發(fā)生器的全雙工WDM-ROF系統(tǒng)。利用其超平坦譜特性提供WDM系統(tǒng)的多信道光源,實(shí)現(xiàn)了具有高頻譜利用率和低功率代價(jià)的1:7全雙工WDM-ROF系統(tǒng)的高效傳輸。5.提出并實(shí)驗(yàn)研究了基于光纖光柵的單邊帶調(diào)制優(yōu)化方案。分別利用相移光柵和實(shí)驗(yàn)室自制的FBG-FP的大范圍透射斜邊特性,將其應(yīng)用于ROF模擬光鏈路中,實(shí)現(xiàn)單邊帶濾波及OCSR調(diào)節(jié)。通過(guò)對(duì)雙邊帶信號(hào)中的一個(gè)邊帶和中心光載波進(jìn)行不同程度的衰減,實(shí)現(xiàn)了 DSB信號(hào)到SSB信號(hào)轉(zhuǎn)換的同時(shí)優(yōu)化OCSR至OdB,提高了 ROF模擬光鏈路的接收靈敏度。此外,論文還對(duì)光纖長(zhǎng)度及OCSR對(duì)鏈路性能的影響進(jìn)行了分析和研究。
[Abstract]:Microwave photonics is a new subject which combines microwave and photonics. The research scope mainly includes high frequency microwave generator, photonic signal processing technology and ROF access system. With the combination of traditional optical fiber communication and wireless communication, ROF technology can realize wireless broadband access of up to Gbps, which provides an opportunity for future large capacity network communication. This paper aims at multi-carrier generator, high-frequency millimeter-wave photonic generator, all-optical frequency up-conversion of multi-channel signal, best single sideband modulation technology and full-duplex WDM-ROF transmission technology. A series of theoretical, simulation and experimental studies are carried out. The concrete research results and contents are as follows: 1. The multicarrier generator used in ROF system is studied experimentally. The output of multi-optical carrier signals can be realized by using FP laser. Although it has the advantage of low cost, its spectrum range and multi-carrier flatness are insufficient. On the basis of this, an ultra-flat multicarrier generator is proposed, which is generated by cascaded optical modulator. The spectrum range and flatness of the multi-carrier can be further improved, and the feasibility of the scheme is verified by experiments. A high frequency millimeter wave photonic generation scheme based on multi-carrier generator is proposed and studied. By using the spectral characteristics of the multi-carrier generator, two optical carrier signals with different frequency intervals are selected to beat to obtain the high-frequency millimeter-wave signals with different frequencies, which can further improve the frequency range of the high-frequency millimeter-wave generation and the performance of the transmission link. The generation of high frequency millimeter-wave signals at 440 GHz and 480 GHz is realized respectively. In this paper, a multi-channel signal and all optical up-conversion scheme based on multi-carrier generator in ROF system is proposed and studied. The existing all optical upconversion technology with low conversion efficiency is improved. By remodulation of the output spectrum of the multicarrier generator, 7 signals are simultaneously up-converted to 60 GHz millimeter wave signals. In order to further improve the efficiency of all-optical up-conversion, 15 channels of signals are realized by using ultra-flat multicarrier generator, and all optical up-conversion. 4. 4 is realized at the same time. A two-way ROF transmission scheme based on multi-carrier generator is proposed. Firstly, a new ROF bidirectional transmission system based on wavelength reuse technology is proposed. The optical carrier of the central station is reused in the base station to provide the light source for the uplink transmission. The downlink 60GHz millimeter wave is generated and the uplink data is loaded and transmitted at the same time. In order to further improve spectrum efficiency and system performance, a full duplex WDM-ROF system based on multicarrier generator is proposed. The multichannel light source of WDM system is provided by using its ultra-flat spectrum characteristic, and the 1:7 full-duplex WDM-ROF system with high spectral efficiency and low power cost is realized. An optimized scheme of single sideband modulation based on fiber grating is proposed and experimentally studied. The phase-shifted grating and FBG-FP are applied to ROF analog optical link to realize single sideband filter and OCSR adjustment. By attenuation of a sideband and a central optical carrier in a bilateral band signal, the OCSR to OdB can be optimized while the DSB signal is converted to SSB signal, and the reception sensitivity of the ROF analog optical link is improved. In addition, the influence of fiber length and OCSR on link performance is analyzed and studied.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN929.1

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