Accession Number : ADD003080

Title :   Broadband Data Modulation System.

Descriptive Note : Patent,


Personal Author(s) : Redman,Charles M ; Moore,Ronald W

Report Date : 08 Jun 1976

Pagination or Media Count : 9

Abstract : The patent relates to a broadband data modulation system for the transmission of amplitude and frequency modulation data with a bandwidth up to and greater than 500 MHz. The system involves the multiple heterodyning of microwave signals with infrared or optical signals. The data modulation system uses multiple passes of the infrared or optical signal through a crystalline material which also has an acoustic signal forming an acousto-optic grating. Fixed gratings are also imbedded in the crystal so as to aid in the guidance of the infrared or optical signal. The output of the crystal comprises an infrared or optical signal modulated with the desired data. which can be transmitted optically to a transponder, which can in turn convert the last-named infrared or optical signal into a transmitted correspondingly modulated RF signal.

Descriptors :   *Modulation, *Patents, Data transmission systems, Broadband, Acoustooptics, Radar pulses, Simulation, Heterodyning, Microwaves, Gratings(Spectra), Laser communications, Infrared communications, Optical communications, Test facilities, Radar

Subject Categories : Test Facilities, Equipment and Methods
      Active & Passive Radar Detection & Equipment
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE