Experimental investigation of polarization modulated free space optical communication with direct detection in a turbulence channel

Ghassemlooy, Zabih, Tang, Xuan and Rajbhandari, Sujan (2012) Experimental investigation of polarization modulated free space optical communication with direct detection in a turbulence channel. IET Communications, 6 (11). pp. 1489-1494. ISSN 1751-8628

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Official URL: http://dx.doi.org/10.1049/iet-com.2011.0780

Abstract

inary polarisation shift keying (BPOLSK) has been proposed to mitigate the atmospheric turbulence-induced fading in free space optical (FSO) communication systems. In this study, the Q-factors obtained for the BPOLSK-FSO system are verified in conjunction with theoretical results to confirm the validity of the proposed scheme. The analytical bit error rate (BER) for the BPOLSK and non-return-to-zero on–off keying (NRZ-OOK) schemes are presented. The authors show that the BPOLSK scheme with direct detection offers improved BER performances compared to NRZ-OOK in the presence of weak turbulence, which is inferred from the experimental Q-factor and theoretical BER. For a turbulence variance σ21 of 0.003 and the transmitted optical power of −16.8 dBm, values for Q-factor are ∼11 and ∼8.5 for BPOLSK and NRZ-OOK schemes, respectively. The authors show that the predicted signal-to-noise ratio (SNR) for BPOLSK and NRZ-OOK schemes are ∼13.5 and ∼15 dB, respectively, for a BER of 10−6 and σ21 of 0.01. When σ21 increases to 0.1, ∼8 dB lower values of SNR is required for BPOLSK compared with NRZ-OOK.

Item Type: Article
Subjects: H600 Electronic and Electrical Engineering
H900 Others in Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Ay Okpokam
Date Deposited: 30 May 2012 08:52
Last Modified: 10 Aug 2015 11:13
URI: http://nrl.northumbria.ac.uk/id/eprint/7462

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