研究和量化了拓扑和访问耦合器对光纤网络物理性能的影响。针对双总线形、星形、环形和双环形四种光纤网络拓扑,比较它们的光纤需求长度、平均传播延迟、传输衰减、最大比特率及容错。结果表明:在100个节点情况下,星形拓扑需要的光纤长度是双环形的3.8倍,而双环形的平均传播延迟是星形的3.3倍;双总线形的传输衰减最大,在10个节点情况下,要求接收器的动态灵敏度达24dB;假设使用垂直腔面激光器和渐变折射率多模光纤,使用容错耦合器导致最大比特率性能降低,双总线形和星形的最大比特率与节点数相关。这些结果可为选择光纤数据总线拓扑和访问耦合器提供参考。 The influence of topologies and access couplers on the physical properties of optical networks is studied and quantified. For the four bus topology of dual bus, star, ring and double loop, their fiber requirements, average propagation delay, transmission attenuation, maximum bit rate and fault tolerance are compared. The results show that the required length of the star topology is 3.8 times that of the double ring and the average propagation delay of the double ring is 3.3 times that of the star at 100 nodes. The attenuation of the double bus is the largest. At the 10 nodes The dynamic response of the receiver is required to reach 24dB. Suppose the vertical cavity laser and the graded-index multimode fiber are used. The use of fault-tolerant couplers results in a decrease of the maximum bit rate performance. The maximum bit rate of dual bus and star and the number of nodes Related. These results provide a reference for selecting fiber data bus topologies and access couplers.