Fiber optic continuous true time-delay modulator

Details Fiber optic continuous true time-delay modulator Fiber optic continuous true time-delay modulator

1993-08-06

1996-06-11

Moskowitz, Nelson

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359276, 359332, 385 3, 356318, G02B 626, G02F 100, H01Q 336

Patent

active

055261701

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.

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Esman et al., "Microwave True Time-Delay Modulator Using Fibre-Optic Dispersion", Elect. Ltrs., vol. 28, No. 20, pp. 1905-1907, Sep. 92.
Duling et al., "Single-Polarization Fibre Amplifier", Elect. Ltrs., vol. 28, No. 12, pp. 1126-1128, Jun. 92.
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