Accession Number : ADA304150

Title :   An Analysis of Delay Resolution for a True Time Delay Photonic Beamformer.

Descriptive Note : Final rept. Oct 92-Mar 94,

Corporate Author : STEVENS INST OF TECH HOBOKEN NJ

Personal Author(s) : Zmuda, Henry ; Toughlian, Edward N.

PDF Url : ADA304150

Report Date : OCT 1995

Pagination or Media Count : 23

Abstract : The problem of obtaining a true time delay photonic beamformer has recently been a topic of great interest. This report examines the design, construction, and testing of a dynamic optical processor for the control of a 20-element phased array antenna operating at L-band (1.2-1.4 GHz). The approach taken here has several distinct advantages. The actual optical control is accomplished with a class of spatial light modulator known as a segmented mirror device (SMD). Optical splitting is efficiently accomplished using a diffractive optical element. The actual time delay is achieved using a single acoustooptic device for all the array elements. The topological configuration is an optical heterodyne system; hence high, potentially millimeter wave center frequencies are possible by mixing two lasers of slightly differing frequencies. Finally, the entire system is spatially integrated into a three dimensional glass substrate. Though the system is presently being configured as a beamformer, it has the ability to operate as a general photonic signal processing element in an adaptive (reconfigurable) transversal frequency filter configuration. Such systems are widely applicable in jammer/noise cancelling systems, broadband ISDN, and for spread spectrum secure communications.

Descriptors :   *PHOTONICS, *BEAM FORMING, *RADAR EQUIPMENT, *DELAY CIRCUITS, MIRRORS, SPATIAL DISTRIBUTION, TIME INTERVALS, HETERODYNING, RESOLUTION, MILLIMETER WAVES, LASERS, TOPOLOGY, CONFIGURATIONS, SPLITTING, OPTICAL EQUIPMENT COMPONENTS, RADAR ANTENNAS, OPTICAL PROCESSING, CANCELLATION, ULTRAHIGH FREQUENCY, SECURE COMMUNICATIONS, PHASED ARRAYS, SEGMENTED, ACOUSTOOPTICS, LIGHT MODULATORS, SPREAD SPECTRUM, L BAND, MICROWAVE BEAMS.

Subject Categories : Electrooptical and Optoelectronic Devices
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE