Abstract
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.
Highlights
Fibre optic infrastructure is very important because it enables data transmissions in long-reach networks and in metro and access networks [1]
The Czech national research and education network (CESNET) experienced ≈120 outages between 2016 and 2017, and the number of outages caused by fibre cuts was ≥10%
Fibres are in cables that are in high-density polyethylene (HDPE) conduits and are more than 70 cm underground, and HDPE filters out higher frequencies
Summary
Fibre optic infrastructure is very important because it enables data transmissions in long-reach networks and in metro and access networks [1]. The Czech national research and education network (CESNET) experienced ≈120 outages between 2016 and 2017, and the number of outages caused by fibre cuts was ≥10%. In cases of special networks such as the national research and education networks (NREN), data and special services may be transmitted (e.g., accurate time, stable frequency or quantum key distribution). Protection of fibre infrastructure by a distributed sensing system may save costs and time necessary for repairs, thereby increasing the quality of the network [2,3]. The main contribution of this article is a basic comparative measurement of two techniques used for distributed fibre optic sensing.
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