發(fā)布時(shí)間：2019-01-02 17:39

【摘要】：隨著單模光纖傳輸容量逐漸接近其理論香農(nóng)極限,尋求新的維度復(fù)用技術(shù)成為研究者們研究的重點(diǎn)。基于少模光纖的模分復(fù)用技術(shù)可能是解決通信容量不足的一種方法,通過(guò)將少模光纖中每一個(gè)傳輸模式看作一個(gè)獨(dú)立的信道,通信容量會(huì)得到成倍的增長(zhǎng)。本文就少模光纖傳輸鏈路三個(gè)關(guān)鍵技術(shù)問(wèn)題展開(kāi)研究,重點(diǎn)探究了少模光纖的設(shè)計(jì)問(wèn)題,少模光纖傳輸光網(wǎng)絡(luò)所適用模式交換光開(kāi)關(guān)以及關(guān)于少模光纖鏈路中的色散監(jiān)測(cè)新方法。首先,對(duì)少模光纖的設(shè)計(jì)問(wèn)題進(jìn)行探究,找出控制光纖傳輸模式數(shù)目的兩個(gè)參數(shù):纖芯半徑與纖芯包層折射率差,控制這兩個(gè)參數(shù)的值,設(shè)計(jì)了一種能夠傳輸四個(gè)模式的少模光纖。通過(guò)理論研究,找出抑制少模光纖非線性的方法,即設(shè)計(jì)盡可能大有效面積的光纖,并且,采用了外下陷包層的設(shè)計(jì),這樣可以減少所設(shè)計(jì)少模光纖的彎曲損耗。所設(shè)計(jì)的少模光纖具有較大的差模群時(shí)延,這樣可以使得各個(gè)模式信道相對(duì)獨(dú)立,降低接收端信號(hào)處理的復(fù)雜度。其次,對(duì)少模光纖光網(wǎng)絡(luò)中的模式交換光開(kāi)關(guān)進(jìn)行了研究。通過(guò)實(shí)驗(yàn)證明了一種現(xiàn)有的適用于自動(dòng)交換光網(wǎng)絡(luò)(ASON)的光開(kāi)關(guān)同樣能夠?qū)ι倌９饫w中傳輸?shù)哪Ｊ饺哼M(jìn)行整體交換,在此結(jié)論的基礎(chǔ)上設(shè)計(jì)集成了一種可重構(gòu)光網(wǎng)絡(luò)平臺(tái),建立了多模光纖、少模光纖及單模光纖之間的固定連接,以及同類光纖之間的交換連接。演示了在各光節(jié)點(diǎn)間IP業(yè)務(wù)、各光節(jié)點(diǎn)間基于TCP/IP協(xié)議的高層協(xié)議FTP,HTTP和基于HDTV協(xié)議的四路高清晰度數(shù)字電視的傳輸,并且通過(guò)網(wǎng)絡(luò)管理軟件實(shí)現(xiàn)了整個(gè)混合傳輸光網(wǎng)絡(luò)中的監(jiān)控。最后,理論分析了少模光纖中一種非線性現(xiàn)象,即四波混頻(FWM)效應(yīng),推導(dǎo)出了存在兩個(gè)空間模式時(shí)的少模非線性薛定諤方程,得出了少模光纖中形成模間四波混頻的模式和波長(zhǎng)位置的各種組合以及它們的相位匹配條件。由模間四波混頻(IM-FWM)的抑制原理得到啟發(fā),提出了一種色散監(jiān)測(cè)方法,該方法可以由FWM產(chǎn)生的閑頻波功率來(lái)表示鏈路中色散的大小,具有實(shí)時(shí)性,簡(jiǎn)單可靠且靈敏度高。通過(guò)仿真軟件Optisystem 14.0設(shè)計(jì)搭建了16QAM少模光纖傳輸系統(tǒng),對(duì)少模光纖鏈路進(jìn)行了色散監(jiān)測(cè)仿真。本文重點(diǎn)研究了以上關(guān)于少模光纖傳輸鏈路的三個(gè)關(guān)鍵技術(shù)問(wèn)題,為以后基于少模光纖的模分復(fù)用系統(tǒng)進(jìn)入大規(guī)模應(yīng)用提供了理論與技術(shù)支持。
[Abstract]:With the transmission capacity of single-mode fiber approaching its theoretical Shannon limit, it has become the focus of researchers to seek new dimensional multiplexing technology. The mode division multiplexing technique based on less mode fiber may be a method to solve the problem of insufficient communication capacity. By treating each transmission mode of the optical fiber as an independent channel, the communication capacity will be increased exponentially. In this paper, three key technology problems of low mode optical fiber transmission link are studied, and the design of low mode optical fiber is emphasized. A new method for dispersion monitoring in a low-mode fiber transmission optical network is presented in this paper, which is suitable for mode switching optical switches and a new method for dispersion monitoring in low-mode fiber links. First of all, the design of low-mode optical fiber is studied to find out two parameters that control the number of fiber transmission modes: the difference between the core radius and the refractive index of the core cladding, and the control values of these two parameters. A four-mode optical fiber with four modes is designed. Through theoretical research, a method to reduce the nonlinearity of low-mode fiber is found, that is, to design a fiber with as large an effective area as possible, and to reduce the bending loss of the designed low-mode fiber by adopting the design of outer trapping cladding. The designed low-mode fiber has a large delay of difference mode group, which can make each mode channel relatively independent and reduce the complexity of signal processing at the receiving end. Secondly, the mode-switched optical switch in low-mode optical fiber network is studied. Through experiments, it is proved that an existing optical switch suitable for (ASON) can switch the mode group in optical fiber. Based on this conclusion, a reconfigurable optical network platform is designed and integrated. The fixed connection between multimode fiber, small mode fiber and single mode fiber, and the exchange connection between the same kind of fiber are established. The transmission of IP service between optical nodes, high level protocol FTP,HTTP based on TCP/IP protocol and four-channel HDTV transmission based on HDTV protocol between each optical node is demonstrated. And through the network management software to achieve the entire hybrid transmission optical network monitoring. Finally, a kind of nonlinear phenomenon, the (FWM) effect of four-wave mixing, is analyzed theoretically, and the nonlinear Schrodinger equation with two spatial modes is derived. Various combinations of modes and wavelength positions and their phase matching conditions for the formation of inter-mode four-wave mixing in low-mode optical fiber are obtained. Inspired by the suppression principle of inter-mode four-wave mixing (IM-FWM), a dispersion monitoring method is proposed. This method can represent the dispersion in the link by the idle frequency wave power generated by FWM. The method is real-time, simple, reliable and sensitive. Based on the simulation software Optisystem 14.0, the 16QAM low-mode optical fiber transmission system is designed and built, and dispersion monitoring simulation of the low-mode fiber link is carried out. This paper focuses on the three key technical issues of the low mode optical fiber transmission link, which provides the theoretical and technical support for the large-scale application of the mode division multiplexing system based on the small mode optical fiber in the future.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.11

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 申佳偉;諸波;陳思嘉;;多模、少模和單模式混合傳輸交換試驗(yàn)床[J];光通信技術(shù);2017年01期

2 鄭興娟;任國(guó)斌;黃琳;鄭鶴玲;;少模光纖的彎曲損耗研究[J];物理學(xué)報(bào);2016年06期

3 姜珊珊;劉艷;邢爾軍;;低差分模式時(shí)延少模光纖的有限元分析及設(shè)計(jì)[J];物理學(xué)報(bào);2015年06期

4 何欣玲;;光纖通信的發(fā)展史及其現(xiàn)狀[J];才智;2013年26期

5 謝意維;付松年;張海亮;唐明;沈平;劉德明;;少模光纖模式差分群時(shí)延的設(shè)計(jì)與優(yōu)化[J];光學(xué)學(xué)報(bào);2013年09期

6 鄒自立;光復(fù)用技術(shù)談[J];光通信技術(shù);2001年03期

相關(guān)碩士學(xué)位論文 前2條

1 吳家梁;彎曲不敏感少模光纖研究[D];北京交通大學(xué);2015年

2 劉俊彥;模分復(fù)用光傳輸系統(tǒng)的建模與仿真[D];北京郵電大學(xué);2015年

，

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