【作者】 张峰；

【导师】 简水生；

【作者基本信息】 北京交通大学 ， 通信与信息系统， 2008， 博士

【摘要】 随着互联网规模的扩大,IPTV、HDTV等新业务的发展,人们对目前网络带宽的需求越来越高,带动了光通信市场的发展。光传输和光交换是光通信的两个主要方面,本论文围绕着光传输和光交换两个方面,结合国家自然科学基金重点项目“高速光通信系统中的偏振模色散补偿及其相关技术与基础研究”和“全光波长交换技术研究”的实施,针对40Gb/s长距离传输、40Gb/s信号的全光信号处理特别是全光时钟提取技术以及啁啾光纤光栅的组网应用等方面进行了深入的理论分析和实验研究。所取得的主要成果如下:◆在仅采用EDFA放大器、无FEC的前提下,与实验室其他师生合作,实现了40Gb/s NRZ信号基于CFBG色散补偿的500km传输,是目前40Gb/sNRZ码基于CFBG传输的最长距离。详细分析了CFBG反射谱、时延和带宽的非理想特性对40Gb/s不同码型传输系统产生的影响。提出一种评价光栅时延纹波的方法,在光栅制作及光栅挑选中可起到很好的辅助分析作用。对基于非理想CFBG色散补偿的40Gb/s传输系统进行了优化。在基于实测CFBG数据的基础上,得到了非理想CFBG+DCF混合色散补偿40Gb/s的长距离传输优化的跨段组合方案。◆利用建立的数值模型优化了基于SBS的全光时钟提取结构,分析了影响提取光时钟脉冲的因素,探讨了该结构抑制码型效应的原理和方法。实验实现了恶化NRZ信号的时钟提取,分析了该时钟提取结构对输入信号恶化程度的容忍度。首次成功从两路10Gb/s NRZ信号中提取到光时钟信号。实验实现了40Gb/s CSRZ信号的基于SBS时钟提取结构的全光时钟提取,同时成功从经8km传输后的40Gb/s CSRZ信号中提取得到了光时钟。采用了AWG来增强非理想RZ信号的CCR,实现了非理想40Gb/s RZ码的全光时钟提取。首次分析了在调制器驱动信号波形存在一定的上升和下降时间时,NRZ信号光谱的CCR与调制器啁啾系数的关系。根据啁啾40Gb/s NRZ信号的光谱特点,提取得到了其时钟信号。◆完善了基于光路交换的全光网演示系统的网络节点的具体功能模块以及分布式端到端的连接功能。研究了在分布式光路交换系统中分布式网管方案、网络资源的自动发现过程以及分布式网络生存性的实现方案,提高网络运行的可靠性。分析和优化了该光路交换系统的传输性能,讨论了该系统下一步的升级过程中面临的一些问题以及解决方案。更多还原

【Abstract】 As the scale of the Internet enlarged, as IPTV, HDTV and other new business developed, the network bandwidth demand is growing fast, which drives the development of optical communication market. Optical transmission and optical switching are the two main aspects of optical communications. In this paper, supported by the key projects of National Natural Science Foundation "Research on PMD compensation and related infrastructure technologies in high-speed optical communication systems" and "Study on all-optical circuit switching technology ", we conduct a deep investigation into the theoretical and experiment researches on the 40Gb/s long-haul transmission, novel technology to 40Gb/s All-optical clock extraction and wavelength routing network applications of chirped fiber Bragg grating. The main results achieved are as follows:With the effort of other teachers and students of our laboratory, A 500km 40Gb/s error-free transmission was implemented in NRZ-employed system where dispersion was compensated by chirped fiber Bragg gratings(CFBGs). In this transmission system, Only EDFA was used to compensated the fiber attenuation and without FEC. It was the longest distance reported on 40Gb/s NRZ transmission based on CFBGs. A novel CFBG quanlity evaluation method was proposed through the detail analysis on the impact of the CFBG non-ideal characteristic, such as the group delay ripple(GDR), reflectivity ripple(RR) and the bandwidth. This method could be quite helpful in grating fabrication and selection. The optimized span packages of hybrid compensation by both non-ideal CFBG and DCF was achieved on the basis the measured data of non-ideal CFBG in 40Gb/s long-distance transmission.Numerical model of all optical stimulated Brillouin scattering(SBS) clock extraction structure was established and optimized. Clock extraction from degraded NRZ signal was experimental realized. The tolerance of the input signal deterioration degree was analyzed. The clocks of dual-wavelength are extracted for the first time, to our best knowledge. Experiments were set up and clocks from 40Gb/s CSRZ 8km and 0km transmission signals were recovered. AWG was adopted to enhance the clock-to-carrier ratio(CCR) of both 40Gb/s non-ideal signal RZ and the chirped NRZ according to their spectrum.Specific functional modules of all optical system based on optical circuit switching were established and enhanced. The end-to-end distributed call and connection was realized. The distributed network management, the automatic discovery of network resources as well as the network survival were detail researched. Transmission performance of this system was analyzed and optimized. Some problems that may be probably faced in the case of network upgrading and evolution were discussed.更多还原