光轨(LT)是一种新型光通信网络结构,具有交换粒度小、带宽利用率高等优点。目前对光轨网络节点结构研究很少,尤其缺乏光轨节点性能仿真和实验研究。鉴于此,设计了一种支持4波长双向通信的光轨网络节点结构;搭建了光轨通信系统仿真平台,对单个光轨节点的光功率损耗,以及联网条件下数据波长的误码率和眼图进行了仿真测试。仿真测试结果显示,单个光轨节点的光功率损耗约16 dB,未配置光放大器时,适用于节点间距小于20 km的光轨网络;配置单个半导体光放大器后,可将节点间距增加5 km。针对节点间距15 km和20 km,系统误码率分别降低了105和102,眼图质量明显改善。该光轨节点具有结构简单、成本低、损耗低的优点,能够满足城域/接入光通信网络的传输要求。 Light Rail (LT) is a new type of optical communication network structure with the advantages of small switching granularity and high bandwidth utilization. At present, there are few researches on the node structure of the optical track network, especially the simulation and experimental research on the performance of the optical track node. In view of this, a node structure of optical rail network supporting 4-wavelength two-way communication is designed. A simulation platform of optical-rail communication system is set up to simulate the optical power loss of a single optical track node and the bit error rate Figure conducted a simulation test. The simulation results show that the optical power loss of a single rail node is about 16 dB. When no optical amplifier is configured, it is suitable for a track network with a node spacing of less than 20 km. After configuring a single semiconductor optical amplifier, the node spacing can be increased by 5 km. For 15 km and 20 km node spacing, the system BER was reduced by 105 and 102, respectively, and the quality of the eye diagram was significantly improved. The track node has the advantages of simple structure, low cost and low loss, and can meet the transmission requirement of the metro / access optical communication network.