【作者】 蒋建锋；

【导师】 孙小菡；

【作者基本信息】 东南大学 ， 物理电子学， 2004， 硕士

【摘要】 波分复用(WDM)技术的发展推动了下一代的通信网络的结构体系的变革。IP数据业务对带宽的巨大需求和WDM系统对带宽的巨大供给促成了IP与WDM系统的结合。IP over WDM网络体系的发展需要灵活、可靠、实时的网络管理控制技术来发挥光网络的优势。由于光网络物理结构本身导致的信号传输损伤,使得作为网络管理与控制关键技术的节点管理技术在进行路由与波长分配时必须考虑物理层的特性,以保证网络的可靠性与服务质量。光信号的传输损伤来源于光纤色散、非线性效应、偏振模色散、节点串扰、放大器噪声等,对传输损伤的评估需要建立光信号与各个网络器件的模型。本文致力于研制基于元件库的WDM光网络高速光信号传输损伤综合评估软件,重点建立了光纤、掺铒光纤放大器(EDFA)、光发射机、接收机等网络器件的虚拟元件库结构和模型,给出了点到点的物理层链路波形、误码率特性评估方法,编制了物理层传输损伤仿真软件,同时实现了图形化用户界面。第一章首先简述了光网络技术的发展概况,重点介绍了光网管理与控制的系统构架、波长分配与路由技术,以及网络中主要器件引入的传输损伤。第二章较为详细分析了光纤中引起传输损伤的各种效应,如色散、自相位调制、交叉相位调制、四波混频等,采用数值计算的方法,建立了对光纤性能的评估方法,构成了光纤元件库框架。第三章讨论了各种对EDFA增益与噪声特性的评估方法,总结了关于EDFA的建模技术,通过合理假设与简化,得出了实用EDFA性能评估模型,给出了EDFA元件库。第四章将网络元件的模型设计成具体的软件模块,构成虚拟的元件库,从系统的角度,提出了完整的物理链路性能的评估方法,在此基础上按照软件工程思想设计了光网路物理层的仿真软件。第五章基于已研制的软件,模拟和仿真了在通常配置条件下的光链路中波形的传输特点,计算了链路误码率特性,得出了与现有文献数据较为一致的结果,从而验证软件的可行性和实用性。第六章主要介绍对网络传输损伤直接补偿技术――光3R技术的调研结果。更多还原

【Abstract】 Revolution of the next generation telecommunication network architectures has been brought with the development of wavelength division multiplexing (WDM) technology. The great demand for bandwidth by IP data services can be satisfied by the broaden bandwidth from WDM system, so that made for the combination of IP with WDM. Building IP over WDM requires flexible, reliable and real-time network management and control technology, in order to perform the important functions of optical network. in the most effective way. Due to transmission impairments caused by the physical layer, routing and wavelength assignment algorithm for network management must take the performance of physical layer into account in order to guarantee the reliability of network and the quality of services. Transmission impairments originate from chromatic dispersion in fibers, nonlinear effects, polarization mode dispersion, node crosstalk, noise introduced by optical amplifiers, etc. The evaluation of transmission impairments requires modeling of every network component. The simulating model for fiber, Erbium doped fiber amplifier (EDFA), optical source and receiver have been established in this dissertation. The performance of waveform and bit error probability has been evaluated and general results are obtained using our simulation software.In Chapter 1, the general situation of optical network development and architectures and the technology of routing and wavelength assignment are briefly introduced. The transmission impairments introduced by the main components are discussed. In Chapter 2, detail analysis of transmission impairments introduced by fiber is presented, including chromatic dispersion, self-phase modulation, cross-phase modulation and four-wave mixing. The performance evaluation is completed using numerical method. In Chapter 3, the technology of EDFA modeling is summarized and the method of evaluating the gain and noise performance of EDFA is studied. The practical model of EDFA is obtained through simplifying and assuming. In Chapter 4, the performance evaluation model for the whole physical link is proposed in the system level base on the previous component models. Component models are designed into software modules to organize the component library. Simulation software is accomplished using software engineering method based on the component library. In Chapter 5, the performance of optical link is obtained using the designed simulation software, which verifies the feasibility and practicability of the software. Optical regeneration technology is introduced in Chapter 6 as complements.更多还原