【作者】 张宏斌；

【导师】 邱昆；

【作者基本信息】 电子科技大学 ， 光纤通信， 2001， 博士

【摘要】 在高度信息化的今天，信息业务传输量迅速攀升，IP数据业务更是呈爆炸式趋势在急剧增加，因而对通信系统的信息传输速率和容量的需求也随之急剧增加。波分复用（WDM）技术充分利用了光纤的传输带宽，极大地满足了目前对传输容量需求急剧增长的需要，已成为当今高速光通信系统的主要信息传输平台；WDM全光网络以WDM传输技术和波长路由为物理平台，以光分插分用（OADM）、光交叉连接（OXC）全光节点代替传统的光电/电光交换节点，在全光网络中任意一对信源和信宿终端间建立起透明的全光传送通道，各节点只需对属于本节点的上/下路或交叉互连信道进行处理，而其余大部分波长信道均可透明传输，因而具有容量大、透明性好、可重构性、易扩容性和抗毁性等优点，代表了未来光通信网络的发展方向，引起了人们的极大关注和广泛研究。本文结合作者所在光纤重点实验室课题研究需要，对WDM全光网络中的一些基础理论和关键技术作了一定的理论和仿真实验研究。作者的主要工作及本文的主要内容如下： 一、全面系统地综述了WDM传输技术及全光网络的研究背景及进展，对未 来光通信网络中的若干关键问题和技术的研究动态作了详细介绍。 二、对点到点WDM传输系统中损耗、色散和非线性效应等问题作了全面阐 述；对光纤的种类及其在光网络中的优化选用问题作了详细介绍和分 析。 三、建立了光波在光纤中传播所遵循的非线性薛定鄂方程；建立了WDM系 统中的四波混频效应（FWM）的产生效率理论分析模型；在此基础上 对影响FWM产生效率的若干因数作了数值计算和分析。 四、在PTDS软件仿真平台上分别对单信道和WDM多信道光纤传输系统作 了大量的计算机仿真实验研究，研究了光纤的衰减、色散、光纤传输距 离、光信号的平均功率、波分复用信道数及信道间隔等参数对光纤传输 系统性能的影响特性，所得结果对优化设计点到点光纤传输系统有积极 的指导作用。 摘 要 五、对全光波长变换器的研究背景、进展及种类作了全面介绍，对常见的全 光波长变换器的工作机理作了相应的介绍和分析；建立了基于半导体光 放大器的交叉增益调制（SOA－XGM）的分段动态模型和整体平均模型 两种理论模型。 六、在PTDS软件仿真环境下分别对基于SOA．XGM和”A－XPM两种重要 的半导体全光波长变换器作了大量的计算机仿真实验研究，仿真研究了 诸如信号光强度、探测光强度、频率间隔、偏置电流等外部参数以及半 一 导体光放大器的长、宽、高等内部结构参数对波长变换器变换性能的影 响特性，提出了上述两类全光波长变换器的优化设计方案和依据。 七、研究了波长变换器在规则格型网络的优化配置问题，得出了在规则格型 网络中均匀配置波长变换器是一种优于其它配置方案的优化配置方案 的结论；讨论了不规则网络中的优化配置算法问题，提出了一种新的配 置算法，研究表明该算法与已有的算法相比能大大节约计算次数：分析 了有限波长转换器在网络中部分节点上的优化配置问题，为降低网络运 行成本及对波长变换器的性能要求提供了指导依据。更多还原

【Abstract】 In today抯 highly information world, the demand for transmission bit rate and capacity have been dramatically increasing driven by the explosively expansion of the information services, especially the IP digital services in Internet. Wavelength Division Multiplexing (WDM) technologies can greatly meet the rapidly growing demand for the transmission capacity by exploiting the huge potential bandwidth of a fiber, which is just a thin strand of silica glass with a diameter comparable to that of a human hair. Nowadays, WDM technologies have been being the primary transmission platform for information services and playing a unique and key role in the current telecommunication field. All-Optical Network (AON) is based on WDM technologies and RWA (Routing and Wavelength Assignment) with OADM and OXC instead of the traditional EADM and EXC switching components. AON is such a network in which the path between the user nodes at the ends remains entirely in optical domain from end to end, only the bit streams for the terminal user nodes or cross-interconnection between channels are added and dropped, while the others of the bit streams are transparently transported between the middle nodes. With its many advantages such as huge capacity, transparency, scalability, reconfiguration, survivability, and so on, All-Optical Network, which represents the evolution direction of the future optical fiber telecommunication networks, has been getting great attention and extensively development. According to the demand of the research projects in the Fiber Key Lab where the author works in, some fundamental theories and key technologies are addressed in this research report. The main work, contribution, and feature of the report are as following: 1, The research background and development of WDM and AON are overviewed in detail; The key issues and technologies of the next optical fiber telecommunication networks are also addressed in detail. 2, The limitations in the Point-to-Point WDM systems imposed by attenuation, dispersion, and nonlinearities, etc. are addressed, and the solutions to the limitations are discussed; The types of fiber are introduced and the optimal use of the available fibers are addressed in detail. 3, The evolution equation explaining the propagation of the optical bits through the nonlinear fiber are derived by solving the nonlinear SchrOdinger equation; The efficiency of the four wave mixing (FWM ) effect in WDM systems are investigated both theoretically and numerically. Some solutions to suppress FWM are presented and discussed. 4, On Photonic Transmission Design Suite (PTDS) platform, the transmission performances of optical signal both in a single channel system and in a WDM system iii are thoroughly investigated by computer emulations. The dependences of the transmission quality on the attenuation and dispersion of fiber, the average power of laser, the channel number, the channel space, etc. are obtained and analyzed. The results are very useful to the optimal design of a point-to-point fiber transmission system. 5, The research background, the development, and the types of all-optical wavelength converters are introduced in detail. The conversion mechanism of the common all-optical wavelength converters is also addressed; The section dynamic model and the lump average model for the wavelength converter based on SOA-XGM are presented. 6, The characteristics of the two important types of semiconductor更多还原