波分复用光传送网中光路的噪声积累模型  

Modeling the Noise Accumulation of Optical Paths in WDM Optical Transport Networks

作　　者：徐志根[1] 周炳琨[1] 张汉一[1] 李艳和[1] 郭奕理[1] 郑小平[1] 秦涛[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《中国激光》2004年第10期1222-1226,共5页Chinese Journal of Lasers

基　　金：国家863计划(863300010299);国家自然科学基金(69990540);国家973计划(G2000036604)资助项目。

摘　　要：根据国际电信联盟(ITUT)建议G.873定义的光传送网(OTN)中光路的假设参考模型(HRM),提出了光路经过多个光节点和光纤传输段后噪声积累的数学模型,推导了解析计算公式,并且按照节点隔离原理推导了计算噪声积累的简化公式以及工程等效模型。分析了光节点中增益(损耗)分配对噪声功率的影响,得出了光节点的优化设计原则。提出的光路噪声模型可以为光网络中光节点和光纤传输段的设计提供参考。A mathematic model is presented for the noise accumulation within optical paths in optical transport networks according to the hypothetical reference model (HRM) defined in ITU T recommendation G.873. The optical paths may pass through multiple optical nodes and fiber links with optical amplifiers. Analytic calculation formulae are derived and simplified according to the node isolation principle. An engineering equivalent model is given, as well as the corresponding calculation formulae. The impact of the gain (attenuation) distribution within an optical node on the noise power is analyzed. Optimum design principles are proposed for optical nodes to reduce noise power in optical paths. The noise models for optical path can be used as a reference for designing optical nodes and fiber transmission spans in optical networks.

关 键 词：光通信 光传送网 噪声积累 光节点 波分复用 

分 类 号：TN929.1[电子电信—通信与信息系统] TP393.03[电子电信—信息与通信工程]