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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 32, Iss. 6 — Mar. 15, 2014
  • pp: 1088–1097

Photon Information Efficient Communication Through Atmospheric Turbulence—Part II: Bounds on Ergodic Classical and Private Capacities

Nivedita Chandrasekaran, Jeffrey H. Shapiro, and Ligong Wang

Journal of Lightwave Technology, Vol. 32, Issue 6, pp. 1088-1097 (2014)


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Abstract

Vacuum-propagation optical communication with high photon efficiency (many bits/photon) and high spectral efficiency (many bits/s $\cdot$ Hz) requires operation in the near-field power transfer regime with a large number of spatial modes. For terrestrial propagation paths, however, the effects of atmospheric turbulence must be factored into the photon and spectral efficiency assessments. In Part I of this study [N. Chandrasekaran and J. H. Shapiro, “Photon Information Efficient Communication Through Atmospheric Turbulence—Part I: Channel Model and Propagation Statistics,” J. Lightw. Technol., vol. 32, no. 6, pp. 1075–1087, Mar. 2014], modal-transmissivity statistics were derived for the turbulent channel that depend solely on the mutual coherence function of the atmospheric Green’s function, and these bounds were evaluated for $\sim$ 200 spatial-mode systems whose transmitters used either focused-beam (FB), Hermite-Gaussian (HG), or Laguerre–Gaussian (LG) modes and whose receivers either did or did not employ adaptive optics. This Part II paper derives upper and lower bounds for the ergodic Holevo capacities of classical and private information transmission over the multiple spatial-mode turbulent channel that can be evaluated from Part I’s transmissivity statistics. Also included are bounds on the ergodic capacity for on–off keying encoding and direct detection. It is shown that: 1) adaptive optics are not necessary to realize high photon information efficiency and high spectral efficiency simultaneously; 2) an FB-mode system with perfect adaptive optics outperforms its HG-mode and LG-mode counterparts; and 3) the converse is true when adaptive optics are not employed.

© 2013 IEEE

Citation
Nivedita Chandrasekaran, Jeffrey H. Shapiro, and Ligong Wang, "Photon Information Efficient Communication Through Atmospheric Turbulence—Part II: Bounds on Ergodic Classical and Private Capacities," J. Lightwave Technol. 32, 1088-1097 (2014)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-32-6-1088


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