Accession Number : ADA194861

Title :   Ultra-Wideband Direction Finding Using a Fiber Optic Beamforming Processor.

Descriptive Note : Professional paper for Jan 88,

Corporate Author : NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s) : Pappert, Stephen A

PDF Url : ADA194861

Report Date : Apr 1988

Pagination or Media Count : 9

Abstract : This paper describes a wideband electro-optic direction finding (DF) processor employing an array of laser diodes, an array of photodetectors, and a network of fiber optic delay lines. This DF filter offers a potential operational bandwidth in excess of 10 GHz and allows for multiple, simultaneous beam angular responses with peaks which are independent of frequency. Two eight-laser, two-beam laboratory test model DF devices, one utilizing multimode optical fiber and the other single-mode fiber, were constructed. These experimental optical beamforming filters are operable in the 100-2000 MHz frequency range and can simultaneously monitor two angles of arrival. Experiments were performed to determine the two systems sensitivity, dynamic range, angular resolution, and frequency response. It is concluded from theoretical and experimental results obtained that the multimode DF device is slightly superior in performance to the single-mode system due to the higher throughput optical power levels possible with multimode systems. Further, it is concluded that this fiber optic beamforming processor can be a useful device for ultra-wideband DF.

Descriptors :   *ANGLE OF ARRIVAL, *DIRECTION FINDING, *ELECTROOPTICS, *FIBER OPTICS, ANGLES, ARRAYS, BANDWIDTH, BEAM FORMING, BROADBAND, DELAY LINES, DIODES, DYNAMIC RANGE, FIBER OPTICS TRANSMISSION LINES, FREQUENCY, FREQUENCY RESPONSE, LASERS, MULTIMODE, OPTICAL FILTERS, PHOTODETECTORS, PROCESSING EQUIPMENT, RESOLUTION, SENSITIVITY

Subject Categories : Target Direction, Range and Position Finding
      Electrooptical and Optoelectronic Devices
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE