Fiber Optic Continuous True Time-Delay Modulator.
Patent, Filed 6 Aug 93, patented 11 Jun 96,
DEPARTMENT OF THE NAVY WASHINGTON DC
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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.
- Electrooptical and Optoelectronic Devices
- Fiber Optics and Integrated Optics