Three-Dimensional Mesh-Based Multipoint Sensing System With Self-Healing Functionality

By strictly assigning and periodically arranging the Bragg wavelengths of fiber Bragg gratings and composing three 2 × 2 optical switches to construct the links and replace the nodes, respectively, we theoretically propose and experimentally demonstrate a novel three-dimensional mesh-based sensing system with comprehensive self-healing functionality. Moreover, a simple and cost-effective sensing signal processor for the classification of sensing signals and the monitoring of sensing elements is also proposed by utilizing the cyclic filtering and free spectral range characteristics of an arrayed waveguide grating.