In accordance with the needs of railway section communication,a new communication system was proposed in this paper,which was based on the optical time division multiplexing technology and passive optical network structure.The system prototype was designed and developed by solving three key problems:the clock synchronization among multiple passive optical interfaces,power equalization for optical fiber links and intersystem protocols.Field tests were made in the section between the Jinmacun Station and Yangtianchong Station on the Shanghai-Kunming Line.The text results show the system design scheme is feasible and it can satisfy the function requirements of the railway section communication specifictions and can realize enhanced data exchange,low costs and high efficiency.%按照铁路区间通信的需求,本文提出一种基于光时分复用技术,采用无源光网络结构的铁路区间光纤通信系统设计方案.通过解决多个无源光接口之间的光同步、链路光功率均衡与系统内部通信协议3个关键技术问题,完成原型设计开发.在沪昆线金马村与秧田冲两车站之间进行现场实验,结果表明设计方案具有可行性,除满足铁路区间通信规范所要求的功能外,还能够提供增强的数据通信功能,成本低,通信质量较高.
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