Accession Number : ADD013135

Title :   High Speed Optically Controlled Sampling System.

Descriptive Note : Patent, Filed 1 Jul 83, patented 8 Oct 85,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Whitehouse,Harper J ; McKnight,William H

Report Date : 08 Oct 1985

Pagination or Media Count : 7

Abstract : 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.

Descriptors :   *PATENTS, *ELECTROOPTICS, *SIGNAL PROCESSING, OPTICAL CIRCUITS, ANTENNA ARRAYS, OPTICAL SWITCHING, DELAY LINES, ANALOG TO DIGITAL CONVERTERS, LOW NOISE, BEAM FORMING

Subject Categories : Electrooptical and Optoelectronic Devices
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE