Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Patent
1986-06-20
1988-02-16
Levy, Stewart J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
350 9611, G01R 2316
Patent
active
047257741
ABSTRACT:
Described herein is an integrated acousto-optic circuit for analyzing the spectrum of a radar signal. A waveguided optical beam is first split into two parts, one of which interacts with a surface acoustic wave generated by a reference signal and the second of which interacts with a surface acoustic wave generated by the signal to be analyzed. The two resulting phase-modulated optical waves then are recombined, Fourier transformed by a lens and finally caused to impinge on an array of photodetectors. The array of detectors is arranged so that each element of the array responds to the combination of one component of the time-varying signal to be analyzed and one component of the time-varying reference signal, that response being an output signal at some preselected radio frequency which is proportional to the amplitude of the frequency component of the radar signal to be analyzed. The several optical components are disclosed as formed on a single substrate integrated optical circuit.
REFERENCES:
patent: 4253060 (1981-02-01), Chen
patent: 4644267 (1987-02-01), Tsui et al.
A Folded-Type IOSA Using Butt-Coupled Chirped Grating Lenses, T. Suhara et al., IEEE J. of Quantum Elect., vol. QE-18, No. 7, Jul. 1982.
Integrated Astable Multivib. Using Mz Interferometric Optical Switches, H. Ito et al., Elect. Letters, Jul. 17th, 1980, vol. 16, No. 15.
Mz Waveguide Modulators in Ti-Diffused LiNbO.sub.3, R. Keil et al., Siemens Forsch J. Entwickl-Ber Bd. 9 (1980), Nr. 1.
Davis Richard L.
Stoll Harold M.
Anderson Terry J.
Arana Louis M.
Block Robert B.
Levy Stewart J.
Northrop Corporation
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