Optimal Focal Plane Processing For Scattered Optical Fields

R. Gagliardi; V. Vilnrotter

doi:10.1117/12.955683

8 December 1977 Optimal Focal Plane Processing For Scattered Optical Fields

R. Gagliardi, V. Vilnrotter

Proceedings Volume 0118, Optical Signal and Image Processing; (1977) https://doi.org/10.1117/12.955683
Event: 21st Annual Technical Symposium, 1977, San Diego, United States

Abstract

It is well known that a scattering medium between a transmitter and receiver in an optical link causes power degradation and loss of spatial coherence in the received field. The spatial coherence loss due to scattering can theoretically be partially recovered by proper receiver design and by invoking specific forms of focal plane processing techniques to aid in restoring the degraded field. This paper reports the results of studies devoted to determining most advantageous focal plane design, assuming statistical knowledge of the scattered field at the receiver. The resulting performance of such processors is also presented in terms of standard communication criteria (collected SNR and digital bit error probabilities). The study has application to optical space transmission through turbulent atmosphere and to optical communications over the air-ocean channel, both of which have been statistically modeled in earlier literature. The basis of the focal plane design is to perform an orthonormal expansion of the scattered field into statistically independent field components. The required processing in the focal plane is then dictated by the proper method for collecting the field components with respect to the desired processing criterion. A result of the study, applied to spatially homogenious scattered fields, is the development of a ring type of photo detector array properly spaced within the receiver focal plane. Performance of such devices is presented.

Citation Download Citation

R. Gagliardi and V. Vilnrotter "Optimal Focal Plane Processing For Scattered Optical Fields", Proc. SPIE 0118, Optical Signal and Image Processing, (8 December 1977); https://doi.org/10.1117/12.955683

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KEYWORDS

Receivers

Signal to noise ratio

Sensors

Signal processing

Scattering

Image processing

Interference (communication)

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