High Speed Optically Controlled Sampling System.
Patent, Filed 1 Jul 83, patented 8 Oct 85,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A number of high frequency signal sources such as a number of receiving ntennas have their information content extracted by an optoelectronic synchronous sampling system. A laser provide pulses of proper frequency and duration and feeds them to fiberoptic bundle. In one embodiment the fibers are lengthened to be simultaneously actuated. Otherwise, each of the fibers in the bundle has a different length so that light emanating from their distal ends appears as a delayed series of actuating light pulses. Phase shifters, pressure or electric field effects, can effect delay and consequent beamforming. Optoelectronic switches are disposed adjacent the distal ends so that the delayed series of actuating pulses actuates the switches in a synchronous sequence to synchronously sample the high frequency signals received by each of the antennas. Interconnected analog-to-digital and processing circuitry conditions the synchronously received samples for further use. The discrete delays assured by the different lengths of the optical fibers and the optoelectronic switches enable responsive synchronous sampling of the number of high frequency sources to extract their information content. There is no EMI or RFI, neither does it generate them. This can effectively operate in a high noise environment.
- Electrooptical and Optoelectronic Devices
- Test Facilities, Equipment and Methods