Munster Petr, Horvath Tomas, Vojtech Josef
Department of Telecommunication, Brno University of Technology, Technicka 12, 616 00 Brno, Czech Republic.
Department of Optical Networks, CESNET a.l.e., Zikova 4, 160 00 Prague, Czech Republic.
Sensors (Basel). 2019 Apr 16;19(8):1810. doi: 10.3390/s19081810.
Fibre optic infrastructures are very important, and therefore, it is necessary to protect them from fibre cuts. Most fibre cuts are caused by digging activity, and many network operators seek appropriate solutions enabling detection of possible unexpected events (predict these cuts) and subsequent network outages. In most cases, there is no need to locate events, and only information regarding the occurrence of the event is sufficient. Direct detection-based distributed fibre optic sensing systems appear to be an appropriate solution, allowing digging to be detected before the fibre breaks. The average power of such signals is relatively small, and there is no interference with other signals in the fibre. We performed laboratory measurements to compare the sensitivity and accuracy of interferometric and polarization systems for acoustic vibrations. In the case of interferometric systems, the reference and sensing arms were in the same cable, and both were subjected to acoustic vibrations.
光纤基础设施非常重要，因此，有必要保护它们免受光纤切断的影响。大多数光纤切断是由挖掘活动引起的，许多网络运营商寻求适当的解决方案，以便能够检测可能发生的意外事件（预测这些切断情况）以及随后的网络中断。在大多数情况下，无需定位事件，仅关于事件发生的信息就足够了。基于直接检测的分布式光纤传感系统似乎是一种合适的解决方案，它能在光纤断裂前检测到挖掘活动。此类信号的平均功率相对较小，且不会对光纤中的其他信号产生干扰。我们进行了实验室测量，以比较干涉式和偏振式系统对声振动的灵敏度和准确性。在干涉式系统中，参考臂和传感臂位于同一根电缆中，且都受到声振动的影响。
