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Proceedings Paper

Analysis Of A Noisy Phase-Only Matched Filter Under Partially Coherent Illumination
Author(s): Bahram Javidi; Francis T.S. Yu
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Paper Abstract

It has been shown that phase-only matched filtering can provide 100% optical efficiency in an optical correlator while at the same time producing a very well defined correlation spot. This analysis has been carried forward and applied to the case of a broad spectral band or white-light optical correlator. The optical correlator under white-light illumination operates at a multiplicity of wavelengths which favorably affect the noise performance of the system. Computer simulations have been used to study the noise suppression qualities of the correlator when noise is present at the filter plane. The result indicates that the noise level at the correlation plane can be reduced by utilizing a higher number of spectral band filters. It is shown that the output signal-to-noise ratio (SNR) improves approximately as the square root of N where N is the number of spectral bands employed in the phase-only matched filter. The coherence requirements for phase-only matched filtering under broadband illumination is studied. The effect of partially coherent illumination on the correlation bandwidth is determined.

Paper Details

Date Published: 21 August 1987
PDF: 8 pages
Proc. SPIE 0754, Optical and Digital Pattern Recognition, (21 August 1987); doi: 10.1117/12.939996
Show Author Affiliations
Bahram Javidi, Michigan State University (United States)
Francis T.S. Yu, Pennsylvania State University (United States)

Published in SPIE Proceedings Vol. 0754:
Optical and Digital Pattern Recognition
Hua-Kuang Liu; Paul S. Schenker, Editor(s)

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