Accession Number : ADD018108

Title :   Fiber Optic Continuous True Time-Delay Modulator.

Descriptive Note : Patent, Filed 6 Aug 93, patented 11 Jun 96,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Esman, Ronald D ; Monsma, Michael J

Report Date : 11 Jun 1996

Pagination or Media Count : 8

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 a single mode optical fiber. 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 :   *FIBER OPTICS, *ELECTROOPTICS, *LIGHT MODULATORS, *PATENTS, *PHASE SHIFT CIRCUITS, TIME INTERVALS, TUNABLE LASERS, CONTINUOUS WAVES, MILLIMETER WAVES, SYNCHRONISM, PHOTODETECTORS, DISPERSIONS, DELAY CIRCUITS

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE