Accession Number : ADD016098

Title :   Fiber Optic Continuous True Time-Delay Modulator.

Descriptive Note : Patent Application, Filed 6 Aug 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Esman, Ronald D

Report Date : 06 Aug 1993

Pagination or Media Count : 21

Abstract : The fiber optic true time-delay modulator generates a continuously variable true time-delay (i.e., phase shift) by utilizing the dispersion characteristic of single mode optical fibers. The signal to be variably delayed modulates a continuous wave optical signal from a tunable laser source which is applied to a dispersive optical fiber wherein the phase shift occurs. The optical intensity output of the dispersive optical fiber is converted back into electrical energy by a photodetector for use in radio frequency, microwave and millimeter wave electronic devices. The invention can be used to generate multiple synchronized output signals by using a multiple wavelength laser or by combining outputs from several independently tuned lasers. Also, frequency and phase shifting is inherently provided by modulating the time delay.

Descriptors :   *PATENT APPLICATIONS, *FIBER OPTICS, *OPTICAL CIRCUITS, *OPTICAL SWITCHING, CONTINUOUS WAVES, ELECTRIC POWER, RADIOFREQUENCY, INTENSITY, LASERS, MICROWAVES, MILLIMETER WAVES, MODULATORS, ELECTROOPTICS, FREQUENCY MODULATORS, PHASE SHIFT, PHOTODETECTORS, SIGNAL PROCESSING, TIME DELAY RELAYS, SIGNALS, TUNABLE LASERS, VARIABLES

Subject Categories : Electrooptical and Optoelectronic Devices
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE