Accession Number:

AD0783281

Title:

Coherent Optical Adaptive Techniques (COAT)

Descriptive Note:

Technical rept. no. 4, 27 Dec 1973-26 Mar 1974

Corporate Author:

HUGHES RESEARCH LABS MALIBU CA

Report Date:

1974-04-01

Pagination or Media Count:

65.0

Abstract:

Coherent optical adaptive techniques are designed to overcome degradations experienced by optical beams propagating in media with fixed or time-varying distortions. This report presents results from the calibration phase of an experimental eighteen-element, self-adaptive optical phased array. Initial tests on a turbulent, outdoor propagation range are also presented. Computer simulation studies have demonstrated the advantages of a divider-AGC network and have detailed the theoretical system performance with glints of varying reflectivities, with various signal-to-noise ratios, and with different receiver aperture diameters. Phase shifter hysteresis was found to have a negligible effect on system performance. Laboratory calibration measurements both with and without artificial turbulence show that the experimental COAT system performs very close to theoretical predictions.

Subject Categories:

  • Optical Detection and Detectors
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE