Underground fiber optics spy on humans moving above
> By shining a laser through the fiber optics, the scientists could detect vibrations from above ground thanks to the way the cable ever so slightly deformed.> Civil engineers are already using DAS to study soil deformation, and biologists are even using offshore fiber optic cables to listen in on whales. (Sound propagates as a vibration, after all.) “It's just really exploding in terms of the applications,”I wonder if ISPs are using residential fiber as an optical microphone [1] array to listen to their customers? If they are not, then I could see this as a future threat. I wonder how one might inexpensively insulate a fiber-optics cable to prevent unwanted eavesdropping.[1] https://www.sciencedirect.com/science/article/abs/pii/092442...