Debris Flow Detection System Based on Tree-Topology Optical Fiber Network

This work tackles the need for strong, passive, wide‑area systems that can detect debris flows and landslides. Conventional electrical sensor networks often fail in harsh environments because they are vulnerable to lightning, weather, and power‑supply problems in remote areas. To solve these issues, the paper proposes a passive optical‑fiber sensor network built in a tree‑topology. The core of the system includes a distributed feedback (DFB) laser, a fiber amplifier, and an amplified photodetector. By adding several optical couplers and carefully placed delay fibers, the network creates many sensing ports without putting any active electronics at the sensor locations. The physical sensor heads are simple fiber patch cables or fiber mirrors

that break or disconnect when struck by moving debris. Time‑division multiplexing (TDM) is used to watch all sensor nodes at once; each node’s position is identified by its unique time delay. Lab‑scale simulations show that a five‑stage tree‑topology works as expected, and the paper outlines how the design could be expanded to a seven‑stage network. This approach gives M.Tech researchers a solid base for projects in optical communications, multiplexing methods, and environmental‑hazard monitoring.

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