河北省科学院学报

在点对点联通场景的小规模光纤网络中，冗余设计是提升任务可靠性的关键。本研究在分析常见双链路拓扑和四链路平行拓扑的基础上，为提升光纤网络的任务可靠性、降低成本冗余，提出了一种四链路交叉拓扑新架构。通过全概率分解法，量化分析了新拓扑的失效概率，进而计算了其任务可靠度、平均无故障工作时间及效费比，并与传统拓扑进行了对比。结果显示，四链路交叉拓扑相对双链路拓扑的任务可靠性提升26.63%,经济性提升8.73%,综合性能明显优于四链路平行拓扑。本研究可为小规模光纤网络的拓扑设计提供新的技术方案与理论依据。

For small-scale optical fiber networks with point-to-point connectivity, redundancy design is crucial for enhancing task reliability. This study analyzes two common topologies—dual-link and four-link parallel—and proposes a novel four-link cross topology to improve task reliability while reducing cost redundancy. The failure probability of the proposed topology is quantified using the total probability decomposition method. Subsequently, its task reliability, mean time between failures, and benefit-cost ratio are calculated and compared with those of conventional topologies. Results demonstrate that the four-link cross topology achieves 26.63% higher task reliability and 8.73% better economy than the dual-link topology, with overall performance superior to the four-link parallel topology. This study provides a new technical solution and theoretical basis for topology design in small-scale optical fiber networks.