超高速OTDM光通信系统关键技术研究

发布时间：2018-05-26 09:03

本文选题：超连续谱 + 色散图谱　；参考：《北京交通大学》2014年博士论文

【摘要】：随着云数据存储、在线高清视频等互联网业务的迅猛发展,对传输容量需求呈现爆炸式增长,如何实现超大容量超远距离传输成为近几年光通信技术研究的热点。其中,超高速光时分复用技术(optical time division multiplexing,简记为OTDM)作为实现未来超大容量通信的有效技术之一,研究者对其进行了广泛而深入的研究。本文结合所承担的国家“863”项目“160Gb/s一泵多纤光传输技术的研究”,针对超高速OTDM系统关键技术,开展了一系列深入的理论、仿真及实验研究,研究内容包括展宽光源频谱相干性和频谱调控原理研究、100km传输链路色散管理设计、时钟增强、基于电吸收调制器和高非线性光纤(highly non-linear fiber,简记为HNLF)的解复用方案,全光波长交换,取得的主要创新成果如下： 1、研究了不同波形下生成超连续谱的相干性。理论并仿真研究无啁啾双曲正割型皮秒脉冲泵浦在HNLF中产生的超连续谱的过程以及在光波分裂前后的相干度变化；研究在不同输入噪声下产生超连续谱的相干度变化；对比研究不同啁啾双曲正割型脉冲下产生超连续谱的相干度变化。仿真得到超连续谱的相干性随不同波形的变化规律。 2、研究了不同波形下生成超连续谱的平坦性。理论分析并仿真研究双曲正割、高斯(m=1)、超高斯(m=5)脉冲形皮秒脉冲泵浦在HNLF产生的超连续谱,得到三种波形的泵浦脉冲在光纤不同位置的时频域图,并深入研究脉冲光源、HNLF参量共同作用对超连续谱的平坦度的影响,探讨影响超连续谱平坦性机制,归纳总结影响超连续谱平坦性的因素和一般规律。 3、采用一种对称的强色散图谱以适合160Gbit/s超高速OTDM信号100km传输,实现了精确补偿色散和色散斜率的同时抑制信道内非线性损伤。在理论研究结果指导下,对160Gbit/s超高速时分复用信号的伪线性传输链路进行色散图谱设计和仿真验证,并搭建实验系统进行实验研究,最终实现160Gbit/s OTDM信号100km两小时无误码传输。 4、理论分析并研究160Gbit/s OTDM信号中各阶时钟分量占比与复用信号幅度之间的联系,采用基于级联电吸收调制器和时钟提取模块组成的光电反馈环,同时实现信号时钟增强和解复用的功能,搭建160Gbit/s OTDM信号100km传输系统进行实验研究,并成功实现160Gbit/s OTDM信号100km传输后时钟得到明显增强。 5、提出采用双向使用HNLF结构对80Gbit/s OTDM信号进行解复用方案,搭建80Gbit/s OTDM传输实验系统对所提出方案进行验证。所提出的解复用结构不仅可以实现对单波80Gbit/s OTDM信号同时解复用出两路无误码基带信号,还可以实现对恶化的160Gbit/s (80Gbit/s×2) OTDM/WDM(wavelength division multiplexing,简记为WDM)解复用和2R再生,并降低一半解复用器的数量。理论研究了存在非线性偏振旋转效应在内的非线性光纤环镜(nonlinear optical loop mirror,简记为NOLM)解复用和2R再生原理,搭建基于NOLM的80Gbit/s OTDM系统进行实验研究,实验结果表明,采用基于NOLM的解复用结构可以从恶化的80Gbit/s OTDM信号中成功的解复用出8路基带信号,并且达到无误码。 6、提出基于双向使用HNLF的波长交换结构。通过此结构分别利用自相位调制(self-phase modulation,简记为SPM)和交叉相位调制(cross-phase modulation,简记为XPM)效应实现两路恶化的OTDM信号之间的波长交换和2R再生功能,并对其进行实验验证。实验结果显示2R再生后的信号眼图清晰且“眼”张开度大,解复用后的各信道均能达到无误码。其中基于SPM效应的方案不需要额外的光源,系统结构简单且实现容易。基于XPM效应的方案需要两个额外的CW光源,但对不同信号之间的波长间隔没有严格的要求,具有更灵活的波长间隔选择。
[Abstract]:With the rapid development of cloud data storage, online high-definition video and other Internet services, the demand for transmission capacity is increasing explosively. How to realize ultra large capacity ultra long distance transmission has become a hot spot in recent years. The ultra high speed optical time division multiplexing (optical time division multiplexing, simply as OTDM) is a hot topic in recent years. It is one of the effective technologies to realize the future super large capacity communication. The researchers have carried out extensive and in-depth research on it. In this paper, in connection with the national "863" project "160Gb/s one pump multi fiber optical transmission technology", a series of in-depth theories, simulation and experimental research are carried out for the key technologies of the super high speed OTDM system. The capacity includes the study of spectrum coherence and spectrum regulation, 100km transmission link dispersion management design, clock enhancement, the demultiplexing scheme based on the electrical absorption modulator and the high non linear fiber (highly non-linear fiber, and HNLF), all optical wavelength switching, and the main innovation results are as follows:
1, the coherence of the supercontinuum generation under different waveforms is studied. The process of supercontinuum generation produced in HNLF without chirped hyperbolic secant type picosecond pulse and the change of coherence before and after the optical wave splitting are studied theoretically and simulated. The degree of coherence of Supercontinuum Generated by chirped hyperbolic secant pulses is simulated, and the coherence of supercontinuum varies with different waveforms.
2, we study the flatness of the supercontinuum generation under different waveforms. The theoretical analysis and Simulation of hyperbolic secant, Gauss (m=1), super Gauss (m=5) pulse picosecond pulse pumped in HNLF, the time and frequency domain diagram of the pump pulses in the different positions of the three kinds of waveforms are obtained, and the joint action of the pulse light source and the HNLF parameter is deeply studied. The influence of the flatness of supercontinuum on the flatness of supercontinuum is discussed, and the factors that affect the flatness of supercontinuum are summarized.
3, a symmetric strong dispersion map is adopted to fit the 160Gbit/s ultra high speed OTDM signal 100km transmission. The dispersion and dispersion slope can be compensated accurately and the nonlinear damage in the channel is suppressed simultaneously. Under the guidance of the theoretical research, the dispersion Atlas of the pseudo linear transmission link of the 160Gbit/s ultra high speed time division multiplexing signal is designed and simulated. Finally, the 160Gbit/s OTDM signal 100km is transmitted for two hours without error code transmission.
4, we analyze and study the relationship between the clock component occupying ratio of each order in 160Gbit/s OTDM signal and the amplitude of the multiplexed signal, and use the photoelectric feedback loop based on the cascaded electronic absorption modulator and the clock extraction module. At the same time, the function of signal clock enhancement and reuse is realized, and the 160Gbit/s OTDM signal 100km transmission system is set up for experimental research. The clock of 160Gbit/s OTDM signal is enhanced obviously after 100km transmission.
5, the dual use HNLF structure is used to demultiplexing the 80Gbit/s OTDM signal, and the 80Gbit/s OTDM transmission experiment system is built to verify the proposed scheme. The proposed demultiplexing structure can not only realize the single wave 80Gbit/s OTDM signal simultaneously demultiplexing the two path unmistakable baseband signals, but also realize the deteriorated 160Gb. It/s (80Gbit/s x 2) OTDM/WDM (wavelength division multiplexing, simply as WDM) demultiplexing and 2R regeneration, and reducing the number of half demultiplexers. The theory of nonlinear optical fiber loop mirrors (nonlinear optical loop mirror, concise) and the principle of regeneration are studied. The experimental study of the 80Gbit/s OTDM system shows that the demultiplexing structure based on NOLM can reuse the 8 path baseband signal successfully from the deteriorated 80Gbit/s OTDM signal and reach the no error code.
6, a wavelength switching structure based on two-way use of HNLF is proposed. By using this structure, the wavelength switching and 2R regeneration function between the two OTDM signals with two deteriorations are realized by using the self phase modulation (self-phase modulation, short note SPM) and cross phase modulation (cross-phase modulation, simply as XPM), and experiments are carried out to verify the experiment. The results show that the 2R regenerated signal has a clear eye map and the "eye" open degree is large. All channels after the demultiplexing can reach no error. The scheme based on the SPM effect does not need additional light source, and the system is simple and easy to realize. The scheme based on the XPM effect requires two additional CW sources, but the wavelength interval between different signals There is no strict requirement for a more flexible wavelength interval selection.
【学位授予单位】：北京交通大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN929.1

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