Hi, Nelly:
Fiber optic cable should emit very little electromagnetic radiation because the fiber optic cable is carrying light not electricity.
From Wikipedia:
Another benefit of fibers is that even when run alongside each other for long distances, fiber cables experience effectively no crosstalk, in contrast to some types of electrical transmission lines. Fiber can be installed in areas with high electromagnetic interference (EMI),(along the sides of utility lines, power-carrying lines, and railroad tracks). All-dielectric cables are also ideal for areas of high lightning-strike incidence.
* Immunity to electromagnetic interference, including nuclear electromagnetic pulses (although fiber can be damaged by alpha and beta radiation).
* High electrical resistance, making it safe to use near high-voltage equipment or between areas with different earth potentials.
* Lighter weight—important, for example, in aircraft.
* No sparks—important in flammable or explosive gas environments.
* Not electromagnetically radiating, and difficult to tap without disrupting the signal—important in high-security environments.
* Much smaller cable size—important where pathway is limited, such as networking an existing building, where smaller channels can be drilled and space can be saved in existing cable ducts and trays.
All in all, for people that are sensitive to EMFs, FIOS looks like a pretty good thing.
Peter
Connecticut