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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。
According to the hypothesis reference model (HRM) of optical path in Optical Transport Network (OTN) as defined by International Telecommunication Union (ITUT) Recommendation G.873, a mathematical model of optical noise accumulation after passing through multiple optical nodes and optical fiber transmission segments is proposed. Analytical formulas are calculated, and the simplified formula for calculating noise accumulation and engineering equivalent model are deduced according to the principle of node isolation. The influence of gain (loss) distribution in optical nodes on noise power is analyzed, and the optimal design principle of optical nodes is obtained. The proposed optical path noise model can provide reference for the design of optical nodes and optical fiber transmission in optical networks.