Lasers, Fiber Optics, and Communications

Bit error rate analysis of the K channel using wavelength diversity

[+] Author Affiliations
Dhaval Shah, Dilip Kumar Kothari

Nirma University, Institute of Technology, Electronics and Communication Department, Ahmedabad, India

Anjan K. Ghosh

Tripura University, Tripura, India

Opt. Eng. 56(5), 056106 (May 23, 2017). doi:10.1117/1.OE.56.5.056106
History: Received December 27, 2016; Accepted April 28, 2017
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Abstract.  The presence of atmospheric turbulence in the free space causes fading and degrades the performance of a free space optical (FSO) system. To mitigate the turbulence-induced fading, multiple copies of the signal can be transmitted on a different wavelength. Each signal, in this case, will undergo different fadings. This is known as the wavelength diversity technique. Bit error rate (BER) performance of the FSO systems with wavelength diversity under strong turbulence condition is investigated. K-distribution is chosen to model a strong turbulence scenario. The source information is transmitted onto three carrier wavelengths of 1.55, 1.31, and 0.85  μm. The signals at the receiver side are combined using three different methods: optical combining (OC), equal gain combining (EGC), and selection combining (SC). Mathematical expressions are derived for the calculation of the BER for all three schemes (OC, EGC, and SC). Results are presented for the link distance of 2 and 3 km under strong turbulence conditions for all the combining methods. The performance of all three schemes is also compared. It is observed that OC provides better performance than the other two techniques. Proposed method results are also compared with the published article.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Dhaval Shah ; Dilip Kumar Kothari and Anjan K. Ghosh
"Bit error rate analysis of the K channel using wavelength diversity", Opt. Eng. 56(5), 056106 (May 23, 2017). ; http://dx.doi.org/10.1117/1.OE.56.5.056106


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