Energy Demodulation-Based All-Fiber Warning System for Landslides

In this paper, a new landslide warning technology, called the energy demodulation-based all-fiber warning system, is introduced. The system can measure the signal of energy change in fiber caused by micro-bending or breakage associated with the displacement of a landslide, and sends alarms at once when the signal intensity in the fiber weakens to a defined threshold. Compared with conventional monitoring technologies, this technology has many unique advantages, such as graded alarming, real-time response, remote monitoring, low cost, and a passive optical network. It is a very convenient and applicable landslide warning system. At present time this system has been developed and used in landslide warning in China.