本文關(guān)鍵詞： 光接入網(wǎng) 調(diào)制 全雙工 眼圖 4PAM　出處：《重慶三峽學(xué)院》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來(lái),以互聯(lián)網(wǎng)為基礎(chǔ)拓展的新興接入業(yè)務(wù)促使人們對(duì)通信接入帶寬的需求日益提升。光纖接入由于其傳輸容量大,成本低,無(wú)電磁輻射等優(yōu)點(diǎn)而成為寬帶接入網(wǎng)中最有潛力的接入技術(shù);但考慮到不同的調(diào)制碼型格式在傳輸過(guò)程中受到色散和非線性效應(yīng)影響是不同的,并且相異的調(diào)制碼型格式直接影響接入系統(tǒng)的頻帶利用率,因此在光接入系統(tǒng)中合理選擇調(diào)制碼型格式不僅僅是提高收發(fā)信號(hào)質(zhì)量的關(guān)鍵因素,也是增加光纖信道傳輸容量的有效方式。本文首先對(duì)當(dāng)前光接入系統(tǒng)中使用最廣泛的無(wú)源光接入系統(tǒng)(PON)做了相關(guān)介紹;然后解釋了使用PON技術(shù)的歷史發(fā)展必然性,描述了 PON系統(tǒng)的一般組成,詳細(xì)的闡述了 PON的兩大主流應(yīng)用模式—以太網(wǎng)無(wú)源光網(wǎng)絡(luò)(EPON)和吉比特?zé)o源光網(wǎng)絡(luò)(GPON)系統(tǒng)的應(yīng)用特性。最后對(duì)光接入系統(tǒng)中各種關(guān)鍵調(diào)制格式的調(diào)制解調(diào)原理做了說(shuō)明。本文主要從在發(fā)射端應(yīng)用新型調(diào)制碼型著手,提出并搭建了不同占空比的歸零4進(jìn)制脈幅調(diào)制(RZ-4PAM)光信號(hào)接入系統(tǒng)和啁啾歸零四進(jìn)制脈幅調(diào)制(CRZ-4PAM)信號(hào)接入系統(tǒng),在分別對(duì)不同占空比的RZ-4PAM信號(hào)和CRZ信號(hào)傳輸前后的眼圖進(jìn)行對(duì)比,并通過(guò)分析各自的接收信號(hào)的誤碼率比較了傳輸性能差異,研究結(jié)果證明了 66%RZ-4PAM信號(hào)不僅傳輸距離更遠(yuǎn),且頻帶利用率更高。同時(shí)在全雙工光接入系統(tǒng)中分別提出采用相關(guān)濾波器和偏振復(fù)用技術(shù)來(lái)改進(jìn)現(xiàn)有的光網(wǎng)絡(luò)單元(ONU)配置方案,兩者在一定程度上都能有效地節(jié)約運(yùn)營(yíng)成本。而且,仿真實(shí)驗(yàn)結(jié)果證明,采用偏振復(fù)用技術(shù)實(shí)現(xiàn)ONU無(wú)色化的光接入系統(tǒng)中光接入信號(hào)的接收質(zhì)量?jī)?yōu)于采用濾波器的方案,主要體現(xiàn)在其上行誤碼率性能更優(yōu)。
[Abstract]:In recent years, the burgeoning access services based on the Internet promote the increasing demand for the communication access bandwidth. Because of its large transmission capacity and low cost, optical fiber access. Without electromagnetic radiation and other advantages, it has become the most potential access technology in broadband access network; However, considering that different modulation formats are affected by dispersion and nonlinear effects in the transmission process, different modulation formats directly affect the bandwidth efficiency of the access system. Therefore, the reasonable choice of modulation code format is not only the key factor to improve the quality of the transceiver signal in the optical access system. It is also an effective way to increase the transmission capacity of fiber channel. Firstly, this paper introduces the passive optical access system (PON), which is the most widely used optical access system. Then it explains the historical development inevitability of using PON technology and describes the general composition of PON system. The two main application modes of PON, Ethernet passive optical network (EPON) and gigabit passive optical network (GPON), are described in detail. Finally, the principle of modulation and demodulation of various key modulation formats in optical access system is explained. This paper mainly starts with the application of new modulation code in the transmitter. A RZ-4PAM optical signal access system with different duty cycle ratio and a chirped RZ-4PAM signal access system are proposed. The RZ-4PAM signal with different duty cycle and CRZ signal before and after transmission were compared, and the difference of transmission performance was compared by analyzing the bit error rate of each received signal. The results show that the RZ-4PAM signal not only transmits far distance. At the same time, correlation filter and polarization multiplexing technology are used to improve the existing optical network unit (ONUN) configuration in the full duplex optical access system. To a certain extent, both of them can save the operation cost effectively. Moreover, the simulation results show that. The receiving quality of optical access signal in ONU colorless optical access system using polarization multiplexing technique is better than that of filter, which is mainly reflected in the better performance of uplink bit error rate (BER).
【學(xué)位授予單位】：重慶三峽學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.1

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