Re: Fiber optic?
TEMPEST is for reading the emissions from a computer monitor.
That is so much of an over - simplification it is better described as false; it is the prevention of any part and all parts of a communications system from generating compromising emanations that a hostile power could detect and use to their advantage. Using fibre optics as transmission paths between different parts of a system can be a major contribution to TEMPEST accreditation; they are also also EMP - proof and RF proof which can be another major bonus if the overall environment has high - power radio transmitters in near proximity.
If it was just "computer monitors" then large TEMPEST - compliant installations wouldn't need TEMPEST rated filters on their AC supplies.
Also see https://en.wikipedia.org/wiki/Tempest_(codename)
Biting the hand that feeds IT
