Abstract
The distributed long-range sensing system, using the standard telecommunication single-mode optical fiber for the distributed sensing of mechanical vibrations, is described. Various events generating vibrations, such as a walking or running person, moving car, train, and many other vibration sources, can be detected, localized, and classified. The sensor is based on phase-sensitive optical time-domain reflectometry (ϕ-OTDR). Related sensing system components were designed and constructed, and the system was tested both in the laboratory and in the real deployment, with an 88 km telecom optical link, and the results are presented in this paper. A two-fiber sensor unit, with a double-sensing range was also designed, and its scheme is described. The unit was constructed and the initial measurement results are presented.
Highlights
Optical fibers are extensively used in telecommunications, where they can transport data at bit rates in the range of terabits per second
Optical fibers spread almost across the whole data network infrastructure, i.e., in the area of WANs, but they are implemented in data centers, within the backbone parts of enterprise networks, in complex telecommunication distribution nodes, and in access data networks (“first-mile”) called FTTx technologies, mainly in the form of passive optical networks (PONs) [1]
R is the convertor responsivity (A/W), PS is the power of the received signal, PL is the power of the local oscillator, ωAOM is the angular frequency of rf pulses driving the acousto-optic modulators (AOM)
Summary
Optical fibers are extensively used in telecommunications, where they can transport data at bit rates in the range of terabits per second. The fiber parameters are partially sensitive to ambient conditions, such as temperature, strain, vibrations, or a strong ambient electromagnetic field, and this has an impact on optical signal propagating through a fiber [2]. These facts predetermine the usage of optical fibers for sensing applications [2].
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