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Fiber Optics For Electromagnetic Pulse (EMP) Simulators

Fiber optic cables were selected to transmit the command and data signals for a new EMP simulator, which will test the vulnerability of electronic systems to high intensity pulse electro-magnetic fields. The transient fields generated by the simulator induce large pulse currents in all coaxial cable and power wiring, and on the surfaces of all electronic enclosures in the vicinity of the EMP simulator sufficient to burn out unprotected electronics. Since no conductive current is induced on the all dielectric fiber optic cables, a major source of spurious signals and circuit damage was eliminated. The transmitters and receivers were essentially EMP hardened to protect from currents induced on the electronic enclosures. Two fiber optic data links transmit individual trigger signals with 1 ns rise times from the command and control center to the two Marx generators situated on either side of the center of the horizontal dipole antenna of the simulator. Two additional fiber optic links transmit, back to the command and control center, the output from probes measuring the voltage developed across the Marx generators. These analogue data links have a 5 ns rise time and a 40:1 signal to peak noise ratio. The data links are 450 m long.