Optical: systems and elements – Optical modulator – Light wave directional modulation
Patent
1989-07-06
1992-06-09
LaRoche, Eugene R.
Optical: systems and elements
Optical modulator
Light wave directional modulation
359285, 364822, G02F 111, G02F 133, G06E 300
Patent
active
051212480
ABSTRACT:
An acousto-optic correlator for wideband signals. The invention is defined by and relates to device in which a laser beam is split into two paths of a Mach-Zehnder interferometer arrangement. A first Bragg cell of which, modulated with a signal Re{S.sub.1 (t)exp(jw.sub.o t)}, receives the first beam that is reflected off a first flat mirror. A second Bragg cell of which, modulated with a signal Re{S.sub.2 (t)exp(jw.sub.o t)}, receives a beam that is reflected off a second flat mirror. The undiffracted light from both of the modulators is blocked. The diffracted light emitted from the first and second Bragg cells passes through first and second imaging lenses respectively. The two diffracted light beams are then combined with an angular separation between beams. The combined beam is incident upon a square-law detector array which is at the image plane of the imaging lenses. Due to the square-law detection process, terms of low frequency biases and complex correlation on a spatial carrier develop. This output is filtered to remove the low frequency component. The remaining signal being demodulated by in-phase and quadrature detection techniques. The correlation magnitude and the phase are calculated. This provides for precise temporal resolution.
REFERENCES:
patent: 4426134 (1984-01-01), Abramovitz et al.
patent: 4558925 (1985-12-01), Casseday et al.
patent: 4644267 (1987-02-01), Tsui et al.
Anderson Christopher S.
Berinato Robert J.
Mohon W. Neil
Zwilling Anthony F.
Dynetics Inc.
LaRoche Eugene R.
Shingleton Michael
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