Time delay beam formation

Details Time delay beam formation Time delay beam formation

1995-02-13

1997-04-22

Epps, Georgia Y.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359 20, 359310, 359577, 359578, 356345, 250550, G02F 111

Patent

active

056233604

ABSTRACT:
Optical systems are disclosed which are capable of generating and rapidly changing time delays of electrical signals for true time delay beam formation and beam steering and for signal processing applications. The systems utilize an interferometer configuration. A first optical modulator in a first leg of the interferometer is used to modulate coherent light with the signal to be delayed. In a second leg of the interferometer, a second optical modulator provides beam steering to a prism stack, which produces a set of plane reference waves having a range of orientations required to generate a desired range of time delays. Preferably the optical modulators are acousto optic Bragg cells. Alternatively, a stack of lens pairs or diffractive optical elements or a holographic optic element may be used in place of the prism stack. The modulated optical signal from the first leg interferes on an array of photodiodes with the reference waves from the second leg. The resulting electrical signals out of the photodiodes are delayed replicas of the signals driving the optical modulator in the first leg.

REFERENCES:
patent: Re30166 (1979-12-01), Lee
patent: 4644267 (1987-02-01), Tsui et al.
patent: 5097351 (1992-03-01), Kramer
patent: 5179463 (1993-01-01), Kramer

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