Decimated Photodetector Array Geometry In Spectrum Analysis: Experimental Results

David W. Graves; Ed Lantz

doi:10.1117/12.946939

22 August 1988 Decimated Photodetector Array Geometry In Spectrum Analysis: Experimental Results

David W. Graves, Ed Lantz

Proceedings Volume 0936, Advances in Optical Information Processing III; (1988) https://doi.org/10.1117/12.946939
Event: 1988 Technical Symposium on Optics, Electro-Optics, and Sensors, 1988, Orlando, FL, United States

Abstract

Acousto-optic interferometric spectrum analysis performs coherent channelization and downconversion of a large number of channels within a wide frequency band. Each IF output requires a photodetector which is typically followed by a pre-amplifier, bandpass filter, and video logarithmic amplifier. Systems with 1000-2000 channels are exceedingly complex. This paper presents experimental results of an architecture which employs an additional Bragg cell to scan the spatial frequency plane across a decimated photodetector array, reducing the number of post detection circuits by effectively timesharing detector channels. The architecture is tested both as an interferometric-and cross-spectrum analyzer which facilitates angle of arrival measurement by preserving the phase difference between the two input signals.

Citation Download Citation

David W. Graves and Ed Lantz "Decimated Photodetector Array Geometry In Spectrum Analysis: Experimental Results", Proc. SPIE 0936, Advances in Optical Information Processing III, (22 August 1988); https://doi.org/10.1117/12.946939

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