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In 2019 some people in Austria and Sweden in Europe and in North America reported feeling ill after new fiber optic cables were installed to their homes.
There appear to be two common problems. These arise, not from the fiber optic cable itself, but from either the type of mechanism used to link it to the home internet cables, or from loading the fiber optic cable with bioactive RF signals.
The problem can be termed Electromagnetic Interference (EMI) or Dirty Electricity (DE). This is possible wherever electrical devices put additional frequencies onto the original signal, causing EM interference with other equipment or biologically.
EMI can still occur on DSL (Digital Subscriber Loop/Line) using traditional copper telephone wires, but these are more limited in the bandwidth they can carry. From 1988 ADSL (Asymmetric Digital Subscriber Line) allowed increased data transmission on top of the analogue voice component.