本文選題：模分復(fù)用　切入點(diǎn)：少模光纖　出處：《北京郵電大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著社會(huì)信息化程度的不斷提高、互聯(lián)網(wǎng)應(yīng)用的迅速普及與多媒體業(yè)務(wù)的日益增加,通信網(wǎng)絡(luò)對(duì)傳輸帶寬的需求呈現(xiàn)爆炸式增長(zhǎng),目前網(wǎng)絡(luò)流量已接近現(xiàn)有傳輸技術(shù)的極限。發(fā)展新型傳輸技術(shù)以滿足未來網(wǎng)絡(luò)的增長(zhǎng)需求已成為一個(gè)迫在眉睫的任務(wù)。以空分復(fù)用為主要內(nèi)容的多維通信傳輸機(jī)制與組網(wǎng)方法的研究已經(jīng)成為當(dāng)前光纖通信領(lǐng)域令人矚目的前沿研究方向和熱點(diǎn)課題。模分復(fù)用屬于空分復(fù)用的一個(gè)類型。模分復(fù)用傳輸系統(tǒng)以不同模式為信息載體,以少模光纖為傳輸鏈路,采用多輸入多輸出結(jié)構(gòu),尚有許多關(guān)鍵的科學(xué)問題亟需研究解決,諸如少模光纖傳輸鏈路中的隨機(jī)模式耦合對(duì)發(fā)送信號(hào)和系統(tǒng)性能的影響以及各種關(guān)鍵設(shè)備(模式轉(zhuǎn)換器、模式復(fù)用器和解復(fù)用器、少模光纖放大器等)的內(nèi)在機(jī)理及設(shè)計(jì)等。本論文主要基于國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)課題“多維復(fù)用光纖通信基礎(chǔ)研究”,對(duì)模分復(fù)用傳輸系統(tǒng)及其關(guān)鍵技術(shù)進(jìn)行了研究,最為主要的研究?jī)?nèi)容為模分復(fù)用傳輸系統(tǒng)接收端MIMO DSP的解模式耦合算法的提出與實(shí)現(xiàn)。 論文的主要研究?jī)?nèi)容與創(chuàng)新工作如下： 建立具有隨機(jī)模式耦合效應(yīng)的少模光纖傳輸鏈路模型 在模分復(fù)用傳輸系統(tǒng)中,少模光纖傳輸鏈路至關(guān)重要。本論文在建立少模光纖傳輸鏈路模型時(shí),重點(diǎn)考慮隨機(jī)模式耦合效應(yīng)的影響。根據(jù)是否考慮光場(chǎng)模式、群時(shí)延和其他模式特性,可以分別建立光場(chǎng)耦合模型和功率耦合模型。根據(jù)耦合強(qiáng)度的不同,分為強(qiáng)耦合機(jī)制和弱耦合機(jī)制。本論文針對(duì)強(qiáng)耦合機(jī)制和弱耦合機(jī)制分別建立了功率耦合模型,并對(duì)兩種耦合機(jī)制下的功率耦合模型進(jìn)行了仿真和接收端的算法處理。 給出模分復(fù)用傳輸系統(tǒng)一般模型并對(duì)其進(jìn)行仿真 通過收集閱讀研究大量文獻(xiàn),對(duì)比總結(jié),給出了模分復(fù)用傳輸系統(tǒng)的一般模型,該系統(tǒng)主要由以下部分組成：發(fā)送端、模式轉(zhuǎn)換器、模式復(fù)用器、少模光纖傳輸鏈路、模式解復(fù)用器、相干接收機(jī)、數(shù)字信號(hào)處理模塊等。深入研究了目前主要使用的以上各器件的原理與實(shí)現(xiàn)方法。在此基礎(chǔ)上,搭建了可以同時(shí)傳輸四個(gè)模式的4×4的模分復(fù)用傳輸系統(tǒng),并完成每個(gè)模式攜帶一路56GBaud的QPSK信號(hào)的傳輸。 三、提出多輸入多輸出恒模算法并利用該算法實(shí)現(xiàn)解模式耦合 本論文首次提出采用多輸入多輸出的恒模算法實(shí)現(xiàn)模分復(fù)用傳輸系統(tǒng)的相干接收端的解模式耦合。將通常用于單模光纖中的解偏振模色散的恒模算法,擴(kuò)展為多輸入多輸出的恒模算法,并將其用于解少模光纖中的模式耦合。采用擴(kuò)展的多輸入多輸出恒模算法,可以實(shí)現(xiàn)在不同耦合強(qiáng)度下,改善了四個(gè)模式的接收信號(hào)的誤比特率性能,并對(duì)算法中濾波器的長(zhǎng)度和迭代步長(zhǎng)對(duì)算法收斂性的影響進(jìn)行了深入研究。
[Abstract]:With the continuous improvement of the degree of social informatization, the rapid popularization of Internet applications and the increasing number of multimedia services, the demand for transmission bandwidth of communication networks is increasing explosively. At present, network traffic is close to the limit of existing transmission technology. It has become an urgent task to develop new transmission technology to meet the needs of future network growth. Multi-dimensional communication transmission machine with space division multiplexing as its main content has become an urgent task. The research on the methods of making and constructing networks has become a hot topic in the field of optical fiber communication. Module division multiplexing belongs to a type of space division multiplexing. Module division multiplexing transmission system uses different modes as information carrier. There are many key scientific problems which need to be studied and solved in the transmission link with a few mode optical fibers and multi-input and multi-output structure. For example, the effects of random mode coupling on transmission signals and system performance in a few mode optical fiber transmission links, as well as various key devices (mode converters, mode multiplexers and demultiplexers, This thesis is mainly based on the national key basic research and development plan "the basic research of multi-dimensional multiplexing optical fiber communication", the module division multiplexing transmission system and its close. Key technology has been studied, The most important research content is to propose and implement the de-mode coupling algorithm of MIMO DSP on the receiving end of modular division multiplexing transmission system. The main contents and innovations of this thesis are as follows:. A Model of small Mode Optical Fiber Transmission Link with Stochastic Mode Coupling effect. In the mode division multiplexing transmission system, the light mode fiber transmission link is very important. In this paper, the influence of random mode coupling effect is considered when establishing the model of the light mode optical fiber transmission link. According to whether the light field mode is considered, the effect of random mode coupling is considered in this paper. The light field coupling model and the power coupling model can be established by group delay and other mode characteristics respectively. In this paper, the power coupling model is established for the strong coupling mechanism and the weak coupling mechanism, and the power coupling model under the two coupling mechanisms is simulated and the algorithm of the receiver is processed. The general model of module division multiplexing transmission system is given and simulated. A general model of module division multiplexing transmission system is presented by collecting and studying a large number of literatures. The system consists of the following parts: the transmitter, the mode converter, the mode multiplexer, the less mode optical fiber transmission link. Mode demultiplexer, coherent receiver, digital signal processing module and so on. A 4 脳 4 module division multiplexing system which can transmit four modes at the same time is built, and each mode carries a 56GB aud QPSK signal. Thirdly, a multi-input and multi-output constant modulus algorithm is proposed and the mode coupling is realized by using the algorithm. In this paper, we propose for the first time a multi-input and multi-output constant mode algorithm to realize the de-mode coupling of coherent receiver in a mode division multiplexing transmission system. A constant mode algorithm, which is usually used for depolarization mode dispersion in single-mode optical fiber, is proposed in this paper. This algorithm is extended to a constant mode algorithm with multiple inputs and outputs, and is used to solve the mode coupling in the optical fiber. The extended multi-input and multi-output constant mode algorithm can be implemented under different coupling strength. The BER performance of received signals in four modes is improved, and the effects of filter length and iterative step size on the convergence of the algorithm are studied.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.11

【共引文獻(xiàn)】

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1 楊柳青青;光OFDM系統(tǒng)中的盲均衡技術(shù)研究[D];湖南大學(xué);2013年

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本文編號(hào)：1592498