一种新的EPON测距技术的研究

Study on a new ringing method of EPON

根据现有的通过时间标签法测距的上行方案提出了一种相对时间标签测距方案,并对两种方案进行了分析比较:由于温度等环境因素变化将引起光纤时延的变化,为将上行数据到达时刻与指定时刻偏差控制在一定范围内,测距需要周期性进行,与原有方案相比,新方案把最小测距周期提高了两倍,操作更加简单,可测得单独上行或下行时延,具有更加广泛的应用。最后通过实验将两方案进行比较,实验结果与理论分析相符。

This paper first present a new ringing method which using time tag of relativity according existing ringing method. Then, the new ringing method is compared with the old one. The time delay of sign when transmitting in the fiber is changing when environment factor changed. So, in order to limiting the error of the upstream data at some scope, ringing must be carded out periodically. The minimum ringing cycle of the new one is double of the old one＇s. Besides, compare with the old ringing method, the new one is achieved more easily and applied more widely. At the last, the two scenarios are compared with experiment, and the result of the experiment is accord with the result of theory analysis.