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Electronics 2015, 4(4), 785-798; doi:10.3390/electronics4040785

Performance Analysis of Heterodyne-Detected OCDMA Systems Using PolSK Modulation over a Free-Space Optical Turbulence Channel

1
Graduate School of Global Information and Telecommunication Studies, Waseda University, 66 bldg., 3-14-9 Ookubo, Shinjuku-ku, Tokyo, Japan
2
Department of Communications and Computer Engineering, Waseda University, 66 bldg., 3-14-9 Ookubo, Shinjuku-ku, Tokyo, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Lei Liu
Received: 30 August 2015 / Accepted: 12 October 2015 / Published: 16 October 2015
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Abstract

This paper presents a novel model of heterodyne-detected optical code-division multiple-access (OCDMA) systems employing polarization shift keying (PolSK) modulation over a free-space optical (FSO) turbulence channel. In this article, a new transceiver configuration and detailed analytical model for the proposed system are provided and discussed, taking into consideration the potential of heterodyne detection on mitigating the impact of turbulence-induced irradiance fluctuation on the performance of the proposed system under the gamma-gamma turbulence channel. Furthermore, we derived the closed-form expressions for the system error probability and outage probability, respectively. We determine the advantages of the proposed modeling by performing a comparison with a direct detection scheme obtained from an evaluation of link performance under the same environment conditions. The presented work also shows the most significant impact factor that degrades the performance of the proposed system and indicates that the proposed approach offers an optimum link performance compared to conventional cases. View Full-Text
Keywords: polarization modulation; optical CDMA (OCDMA); free-space optical (FSO); heterodyne detection; gamma-gamma turbulence model polarization modulation; optical CDMA (OCDMA); free-space optical (FSO); heterodyne detection; gamma-gamma turbulence model
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Bai, F.; Su, Y.; Sato, T. Performance Analysis of Heterodyne-Detected OCDMA Systems Using PolSK Modulation over a Free-Space Optical Turbulence Channel. Electronics 2015, 4, 785-798.

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