This is nothing new. Fiber has been used for years in various detection systems from long perimeter fences where it will alarm for intruders trying to climb ov

This is nothing new. Fiber has been used for years in various detection systems from long perimeter fences where it will alarm for intruders trying to climb over, to downhole drilling where fiber loops detect pipe break locations in oil & gas wells. It's detecting vibration and you can get this down to within a few meters along a +/-2km run if I remember correctly.