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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 30, Iss. 16 — Aug. 15, 2012
  • pp: 2689–2695

Coherent Heterodyne Multilevel Polarization Shift Keying With Spatial Diversity in a Free-Space Optical Turbulence Channel

Xuan Tang, Zabih Ghassemlooy, Sujan Rajbhandari, Wasiu O. Popoola, and Chung Ghiu Lee

Journal of Lightwave Technology, Vol. 30, Issue 16, pp. 2689-2695 (2012)


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Abstract

This paper proposes a coherent multilevel polarization shift keying (MPOLSK) modulation scheme using the spatial diversity detection in a free-space optical (FSO) turbulence channel. The symbol error probability (SEP) analysis for the proposed MPOLSK system under various turbulence regimes has been carried out. The power penalty caused by the phase tracking error has been investigated. For instance, the error floors of 1.3× 10-5 and 3.4× 10-3 are observed for 8POLSK with the phase tracking variances of σΔ = 0.3 and 0.5, respectively. The maximum ratio combining technique has been applied in the MPOLSK receiver in order to improve the SEP performance. To achieve a SEP of 10-9, the spatial diversity gains required for a 16POLSK-FSO employing four detectors are ~5.8, ~15.8, and ~13.7 dB in weak, moderate, and strong turbulence regimes, respectively.

© 2012 IEEE

Citation
Xuan Tang, Zabih Ghassemlooy, Sujan Rajbhandari, Wasiu O. Popoola, and Chung Ghiu Lee, "Coherent Heterodyne Multilevel Polarization Shift Keying With Spatial Diversity in a Free-Space Optical Turbulence Channel," J. Lightwave Technol. 30, 2689-2695 (2012)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-30-16-2689


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