Analysis Of A Noisy Phase-Only Matched Filter Under Partially Coherent Illumination

Bahram Javidi; Francis T.S. Yu

doi:10.1117/12.939996

21 August 1987 Analysis Of A Noisy Phase-Only Matched Filter Under Partially Coherent Illumination

Bahram Javidi, Francis T.S. Yu

Proceedings Volume 0754, Optical and Digital Pattern Recognition; (1987) https://doi.org/10.1117/12.939996
Event: OE LASE'87 and EO Imaging Symposium, 1987, Los Angeles, CA, United States

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.

Citation Download Citation

Bahram Javidi and Francis T.S. Yu "Analysis Of A Noisy Phase-Only Matched Filter Under Partially Coherent Illumination", Proc. SPIE 0754, Optical and Digital Pattern Recognition, (21 August 1987); https://doi.org/10.1117/12.939996

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KEYWORDS

Signal to noise ratio

Optical filters

Phase only filters

Optical correlators

Electronic filtering

Computer simulations

Optical pattern recognition

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