Optical: systems and elements – Optical modulator – Light wave directional modulation
Patent
1995-05-03
1998-10-13
Nelms, David C.
Optical: systems and elements
Optical modulator
Light wave directional modulation
359285, G02F 133
Patent
active
058221115
ABSTRACT:
A apparatus and method for coherently stretching or compressing signals of nterest, i.e. without loss of information. A first, or tapping, Bragg cell has an acoustic signal launched in it which is modulated onto a laser carrier. The signal of interest is launched into a second, or signal, Bragg cell, and is similarly modulated onto the carrier exiting the first Bragg cell. Upon demodulation, the resultant signal, is the convolution of the two acoustic signals in the respective Bragg cells, but whose duration is either stretched or compressed according to the relative velocity between the acoustic signals in the two Bragg cells, and by the magnification of optics between the two cells. If the signal in the first Bragg cell is of such a short duration that it is effectively an impulse, the resultant signal is a coherently stretched or compressed replica of the signal launched into the second Bragg cell, i.e. the signal of interest.
REFERENCES:
patent: 3535657 (1970-10-01), Webb
patent: 4110016 (1978-08-01), Berg et al.
patent: 4579421 (1986-04-01), Brown et al.
Alexander Edward M.
Lee John N.
Spezio Anthony E.
Bey Dawn-Marie
McDonnell Thomas E.
Miles Edward F.
Nelms David C.
The United States of America as represented by the Secretary of
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