Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1992-04-02
1993-06-15
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
359287, 359314, 342375, G02F 111
Patent
active
052201635
ABSTRACT:
By applying a spatial frequency dependent phase compensation in an optical heterodyning system, a variable rf delay line can be synthesized. The system is able to generate continuously variable phased microwave signals over a prescribed frequency band. A primary application of these variable delay lines is in the area of phased array antenna systems. Because the phototonic delay line synthesizes true time delay, it can be used as part of wide bandwidth system to achieve 100% fractional bandwidth without beam squint. The system lends itself to an optically integrated implementation using a 2-D deformable mirror device to achieve very high packing density which is very useful for an adaptive transversal filter.
REFERENCES:
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patent: 4565983 (1986-01-01), Gratze
patent: 4696061 (1987-09-01), Labrum
patent: 4976518 (1990-12-01), Burns
patent: 5117239 (1992-05-01), Riza
Toughlian, Edward N. et al, "A Photonic Variable RF Delay Line for Phased Array Antennas", Journal of Lightwave Technology, vol. 8, No. 12, Dec. 1990, pp. 1824-1828.
Toughlian Edward N.
Zmuda Henry
Lee John R.
Nathans Robert L.
Nelms David C.
Singer Donald J.
The United States of America as represented by the Secretary of
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