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

Z. Ghassemlooy; X. Tang; S. Rajbhandari

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

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

Author(s): Z. Ghassemlooy ; X. Tang ; S. Rajbhandari
DOI: 10.1049/iet-com.2011.0780

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Author(s): Z. Ghassemlooy ¹ ; X. Tang ¹ ; S. Rajbhandari ¹
- Affiliations: 1: Optical Communications Research Group, NCRLab, School of Computing, Engineering and Information Sciences, Northumbria University, Newcastle Upon Tyne, UK
Source: Volume 6, Issue 11, 24 July 2012, p. 1489 – 1494
DOI: 10.1049/iet-com.2011.0780 , Print ISSN 1751-8628, Online ISSN 1751-8636

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Binary 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.

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

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