基于布里渊频移特征的OPGW光缆接续杆塔与断纤定位方法

Connection Tower and Fiber Breakpoint Location Method for OPGW Based on Brillouin Frequency Shift Characteristics

光纤复合架空地线(OPGW)接续杆塔与断纤的准确定位对于电力通信网络运行维护具有重要意义。目前OPGW光缆故障定位普遍采用光时域反射仪(OTDR)测量断点距离及衰减信息,由于OTDR测量结果为光纤长度,无法与杆塔明细表中记录的物理距离一一对应,且OTDR在长距离测量时受限于空间分辨率,无法实现光纤接续点、断纤与物理杆塔的准确对应,故提出一种利用多根纤芯布里渊频移跳变和引下线处布里渊频移特征实现OPGW光缆接续杆塔精准定位的方法。通过比对断纤与完好纤芯的布里渊频移,实现了光缆故障的精准定位。同时,本文提出的方法在实际OPGW线路运维工作中得到了初步应用,实现了OPGW光缆接续杆塔及故障纤芯的精准定位,为电力OPGW光缆的精细化运维提供了新的技术支撑手段。

The accurate location of optical fiber composite overhead ground wire(OPGW) connection towers and fiber breakpoints is of great significance to the operation and maintenance of power communication networks. At present, during OPGW fault location, the optical time-domain reflectometer(OTDR) is generally used to measure breakpoint distances and attenuation information. Since the OTDR measurement result is fiber length, which does not correspond to the physical distance recorded in the tower schedule. In addition, the OTDR is limited by the spatial resolution when measuring long distances, making the fiber connection points and fiber breakpoints do not correspond to the towers. In response, this paper proposed a method that used the Brillouin frequency shift hopping in multiple fiber cores and the characteristics of the Brillouin frequency shifts of the downleads to achieve precise location of the OPGW connection towers. Precise OPGW fault location was achieved by comparing the Brillouin frequency shifts of the broken fiber cores and the intact fiber core. Moreover, the method proposed in this paper has been initially applied in actual OPGW line operation and maintenance. As a result, precise location of the OPGW connection towers and the faulty fiber cores have been achieved. This study provides a new technical support method for the refined operation and maintenance of the OPGW.